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52 vulnerabilities by svelte
CVE-2026-42599 (GCVE-0-2026-42599)
Vulnerability from nvd – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:39
VLAI
Title
Cross-site scripting via spread attributes in Svelte SSR
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. Note that this vulnerability only triggers if the user's browser has JavaScript enabled but Svelte's hydration mechanism does not reach the vulnerable element before the event fires. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-42573 (GCVE-0-2026-42573)
Vulnerability from nvd – Published: 2026-06-09 16:21 – Updated: 2026-06-09 18:25
VLAI
Title
Svelte: XSS via DOM Clobbering of Internal Framework State
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-42570 (GCVE-0-2026-42570)
Vulnerability from nvd – Published: 2026-06-09 16:12 – Updated: 2026-06-09 18:06
VLAI
Title
Svelte devalue: DoS via sparse array deserialization
Summary
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/devalue/security/advi… | x_refsource_CONFIRM |
| https://github.com/sveltejs/devalue/commit/206ca6… | x_refsource_MISC |
| https://github.com/sveltejs/devalue/releases/tag/v5.8.1 | x_refsource_MISC |
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CVE-2026-42567 (GCVE-0-2026-42567)
Vulnerability from nvd – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:09
VLAI
Title
Svelte: ReDoS in `<svelte:element>` Tag Validation
Summary
Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-40074 (GCVE-0-2026-40074)
Vulnerability from nvd – Published: 2026-04-10 16:26 – Updated: 2026-04-14 14:17
VLAI
Title
SvelteKit's invalidated redirect in handle hook causes Denial-of-Service
Summary
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, redirect, when called from inside the handle server hook with a location parameter containing characters that are invalid in a HTTP header, will cause an unhandled TypeError. This could result in DoS on some platforms, especially if the location passed to redirect contains unsanitized user input. This vulnerability is fixed in 2.57.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-755 - Improper Handling of Exceptional Conditions
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/kit/security/advisori… | x_refsource_CONFIRM |
| https://github.com/sveltejs/kit/commit/10d7b44425… | x_refsource_MISC |
| https://github.com/sveltejs/kit/releases/tag/@sve… | x_refsource_MISC |
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CVE-2026-40073 (GCVE-0-2026-40073)
Vulnerability from nvd – Published: 2026-04-10 16:24 – Updated: 2026-04-13 15:36
VLAI
Title
SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-node
Summary
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, under certain circumstances, requests could bypass the BODY_SIZE_LIMIT on SvelteKit applications running with adapter-node. This bypass does not affect body size limits at other layers of the application stack, so limits enforced in the WAF, gateway, or at the platform level are unaffected. This vulnerability is fixed in 2.57.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/kit/security/advisori… | x_refsource_CONFIRM |
| https://github.com/sveltejs/kit/commit/3202ed6c98… | x_refsource_MISC |
| https://github.com/sveltejs/kit/releases/tag/@sve… | x_refsource_MISC |
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CVE-2026-30226 (GCVE-0-2026-30226)
Vulnerability from nvd – Published: 2026-03-11 17:47 – Updated: 2026-03-12 13:51
VLAI
Title
devalue has prototype pollution in devalue.parse and devalue.unflatten
Summary
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. In devalue v5.6.3 and earlier, devalue.parse and devalue.unflatten were susceptible to prototype pollution via maliciously crafted payloads. Successful exploitation could lead to Denial of Service (DoS) or type confusion. This vulnerability is fixed in 5.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/devalue/security/advi… | x_refsource_CONFIRM |
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CVE-2026-27902 (GCVE-0-2026-27902)
Vulnerability from nvd – Published: 2026-02-26 00:58 – Updated: 2026-02-26 18:51
VLAI
Title
Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0298e97… | x_refsource_MISC |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-27901 (GCVE-0-2026-27901)
Vulnerability from nvd – Published: 2026-02-26 00:57 – Updated: 2026-02-26 14:31
VLAI
Title
Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, the contents of `bind:innerText` and `bind:textContent` on `contenteditable` elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0df5abc… | x_refsource_MISC |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-27121 (GCVE-0-2026-27121)
Vulnerability from nvd – Published: 2026-02-20 22:27 – Updated: 2026-02-23 19:34
VLAI
Title
Svelte affected by cross-site scripting via spread attributes in Svelte SSR
Summary
svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
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CVE-2026-27125 (GCVE-0-2026-27125)
Vulnerability from nvd – Published: 2026-02-20 22:29 – Updated: 2026-02-25 21:33
VLAI
Title
Svelte SSR attribute spreading includes inherited properties from prototype chain
Summary
svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/73098bb… | x_refsource_MISC |
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CVE-2026-27119 (GCVE-0-2026-27119)
Vulnerability from nvd – Published: 2026-02-20 22:25 – Updated: 2026-02-23 19:42
VLAI
Title
Svelte affected by XSS in SSR `<option>` element
Summary
svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-27122 (GCVE-0-2026-27122)
Vulnerability from nvd – Published: 2026-02-20 22:28 – Updated: 2026-02-23 19:23
VLAI
Title
Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
Summary
svelte performance oriented web framework. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2025-15265 (GCVE-0-2025-15265)
Vulnerability from nvd – Published: 2026-01-15 19:59 – Updated: 2026-01-15 20:28
VLAI
Title
Svelte 5.46.0 - Hydratable Key Script-Breakout XSS (SSR)
Summary
An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise.
This issue affects Svelte: from 5.46.0 before 5.46.3.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://fluidattacks.com/advisories/lydian | third-party-advisory |
| https://github.com/sveltejs/svelte/security/advis… | vendor-advisory |
Impacted products
Credits
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CVE-2026-22775 (GCVE-0-2026-22775)
Vulnerability from nvd – Published: 2026-01-15 18:59 – Updated: 2026-01-15 19:22
VLAI
Title
devalue vulnerable to denial of service due to memory/CPU exhaustion in devalue.parse
Summary
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.1.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the ArrayBuffer hydration expecting base64 encoded strings as input, but not checking the assumption before decoding the input. This vulnerability is fixed in 5.6.2.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-405 - Asymmetric Resource Consumption (Amplification)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/devalue/security/advi… | x_refsource_CONFIRM |
| https://github.com/sveltejs/devalue/commit/117558… | x_refsource_MISC |
| https://github.com/sveltejs/devalue/releases/tag/v5.6.2 | x_refsource_MISC |
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CVE-2026-42599 (GCVE-0-2026-42599)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:39
VLAI
Title
Cross-site scripting via spread attributes in Svelte SSR
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, when using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. Note that this vulnerability only triggers if the user's browser has JavaScript enabled but Svelte's hydration mechanism does not reach the vulnerable element before the event fires. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-42567 (GCVE-0-2026-42567)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:22 – Updated: 2026-06-09 18:09
VLAI
Title
Svelte: ReDoS in `<svelte:element>` Tag Validation
Summary
Svelte is a performance oriented web framework. From version 5.51.5 to before version 5.55.7, an internal regex in the Svelte runtime can take exponential time to test in <svelte:element this={tag}></svelte:element>. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-42573 (GCVE-0-2026-42573)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:21 – Updated: 2026-06-09 18:25
VLAI
Title
Svelte: XSS via DOM Clobbering of Internal Framework State
Summary
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/releases/tag/s… | x_refsource_MISC |
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CVE-2026-42570 (GCVE-0-2026-42570)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:12 – Updated: 2026-06-09 18:06
VLAI
Title
Svelte devalue: DoS via sparse array deserialization
Summary
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/devalue/security/advi… | x_refsource_CONFIRM |
| https://github.com/sveltejs/devalue/commit/206ca6… | x_refsource_MISC |
| https://github.com/sveltejs/devalue/releases/tag/v5.8.1 | x_refsource_MISC |
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CVE-2026-40074 (GCVE-0-2026-40074)
Vulnerability from cvelistv5 – Published: 2026-04-10 16:26 – Updated: 2026-04-14 14:17
VLAI
Title
SvelteKit's invalidated redirect in handle hook causes Denial-of-Service
Summary
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, redirect, when called from inside the handle server hook with a location parameter containing characters that are invalid in a HTTP header, will cause an unhandled TypeError. This could result in DoS on some platforms, especially if the location passed to redirect contains unsanitized user input. This vulnerability is fixed in 2.57.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-755 - Improper Handling of Exceptional Conditions
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/kit/security/advisori… | x_refsource_CONFIRM |
| https://github.com/sveltejs/kit/commit/10d7b44425… | x_refsource_MISC |
| https://github.com/sveltejs/kit/releases/tag/@sve… | x_refsource_MISC |
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CVE-2026-40073 (GCVE-0-2026-40073)
Vulnerability from cvelistv5 – Published: 2026-04-10 16:24 – Updated: 2026-04-13 15:36
VLAI
Title
SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-node
Summary
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, under certain circumstances, requests could bypass the BODY_SIZE_LIMIT on SvelteKit applications running with adapter-node. This bypass does not affect body size limits at other layers of the application stack, so limits enforced in the WAF, gateway, or at the platform level are unaffected. This vulnerability is fixed in 2.57.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/kit/security/advisori… | x_refsource_CONFIRM |
| https://github.com/sveltejs/kit/commit/3202ed6c98… | x_refsource_MISC |
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CVE-2026-30226 (GCVE-0-2026-30226)
Vulnerability from cvelistv5 – Published: 2026-03-11 17:47 – Updated: 2026-03-12 13:51
VLAI
Title
devalue has prototype pollution in devalue.parse and devalue.unflatten
Summary
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. In devalue v5.6.3 and earlier, devalue.parse and devalue.unflatten were susceptible to prototype pollution via maliciously crafted payloads. Successful exploitation could lead to Denial of Service (DoS) or type confusion. This vulnerability is fixed in 5.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/devalue/security/advi… | x_refsource_CONFIRM |
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CVE-2026-27902 (GCVE-0-2026-27902)
Vulnerability from cvelistv5 – Published: 2026-02-26 00:58 – Updated: 2026-02-26 18:51
VLAI
Title
Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0298e97… | x_refsource_MISC |
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CVE-2026-27901 (GCVE-0-2026-27901)
Vulnerability from cvelistv5 – Published: 2026-02-26 00:57 – Updated: 2026-02-26 14:31
VLAI
Title
Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`
Summary
Svelte performance oriented web framework. Prior to version 5.53.5, the contents of `bind:innerText` and `bind:textContent` on `contenteditable` elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/0df5abc… | x_refsource_MISC |
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CVE-2026-27125 (GCVE-0-2026-27125)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:29 – Updated: 2026-02-25 21:33
VLAI
Title
Svelte SSR attribute spreading includes inherited properties from prototype chain
Summary
svelte performance oriented web framework. Prior to 5.51.5, in server-side rendering, attribute spreading on elements (e.g. <div {...attrs}>) enumerates inherited properties from the object's prototype chain rather than only own properties. In environments where Object.prototype has already been polluted — a precondition outside of Svelte's control — this can cause unexpected attributes to appear in SSR output or cause SSR to throw errors. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
| https://github.com/sveltejs/svelte/commit/73098bb… | x_refsource_MISC |
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CVE-2026-27122 (GCVE-0-2026-27122)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:28 – Updated: 2026-02-23 19:23
VLAI
Title
Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
Summary
svelte performance oriented web framework. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-27121 (GCVE-0-2026-27121)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:27 – Updated: 2026-02-23 19:34
VLAI
Title
Svelte affected by cross-site scripting via spread attributes in Svelte SSR
Summary
svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2026-27119 (GCVE-0-2026-27119)
Vulnerability from cvelistv5 – Published: 2026-02-20 22:25 – Updated: 2026-02-23 19:42
VLAI
Title
Svelte affected by XSS in SSR `<option>` element
Summary
svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sveltejs/svelte/security/advis… | x_refsource_CONFIRM |
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CVE-2025-15265 (GCVE-0-2025-15265)
Vulnerability from cvelistv5 – Published: 2026-01-15 19:59 – Updated: 2026-01-15 20:28
VLAI
Title
Svelte 5.46.0 - Hydratable Key Script-Breakout XSS (SSR)
Summary
An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise.
This issue affects Svelte: from 5.46.0 before 5.46.3.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://fluidattacks.com/advisories/lydian | third-party-advisory |
| https://github.com/sveltejs/svelte/security/advis… | vendor-advisory |
Impacted products
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CVE-2026-22775 (GCVE-0-2026-22775)
Vulnerability from cvelistv5 – Published: 2026-01-15 18:59 – Updated: 2026-01-15 19:22
VLAI
Title
devalue vulnerable to denial of service due to memory/CPU exhaustion in devalue.parse
Summary
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.1.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the ArrayBuffer hydration expecting base64 encoded strings as input, but not checking the assumption before decoding the input. This vulnerability is fixed in 5.6.2.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-405 - Asymmetric Resource Consumption (Amplification)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sveltejs/devalue/security/advi… | x_refsource_CONFIRM |
| https://github.com/sveltejs/devalue/commit/117558… | x_refsource_MISC |
| https://github.com/sveltejs/devalue/releases/tag/v5.6.2 | x_refsource_MISC |
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