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12 vulnerabilities by nodeca
CVE-2026-59870 (GCVE-0-2026-59870)
Vulnerability from nvd – Published: 2026-07-08 15:13 – Updated: 2026-07-08 15:50
VLAI
EPSS
VEX
Title
js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing
Summary
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/39f3211a… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/5.2.1 | x_refsource_MISC |
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CVE-2026-59869 (GCVE-0-2026-59869)
Vulnerability from nvd – Published: 2026-07-08 15:15 – Updated: 2026-07-09 15:14
VLAI
EPSS
VEX
Title
js-yaml: YAML merge-key chains can force quadratic CPU consumption
Summary
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/24f13e79… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/59423c6f… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/3.15.0 | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/4.3.0 | x_refsource_MISC |
Impacted products
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CVE-2026-59868 (GCVE-0-2026-59868)
Vulnerability from nvd – Published: 2026-07-08 15:18 – Updated: 2026-07-09 13:42
VLAI
EPSS
VEX
Title
js-yaml: YAML merge-key chains can force quadratic CPU consumption
Summary
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/3105455b… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/5.2.0 | x_refsource_MISC |
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CVE-2026-53550 (GCVE-0-2026-53550)
Vulnerability from nvd – Published: 2026-06-22 14:59 – Updated: 2026-06-29 15:06
VLAI
EPSS
VEX
Title
js-yaml: Quadratic-complexity DoS in merge key handling via repeated aliases
Summary
js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
Impacted products
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CVE-2025-64718 (GCVE-0-2025-64718)
Vulnerability from nvd – Published: 2025-11-13 15:32 – Updated: 2026-01-29 22:08
VLAI
EPSS
VEX
Title
js-yaml has prototype pollution in merge (<<)
Summary
js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (`__proto__`). All users who parse untrusted yaml documents may be impacted. The problem is patched in js-yaml 4.1.1 and 3.14.2. Users can protect against this kind of attack on the server by using `node --disable-proto=delete` or `deno` (in Deno, pollution protection is on by default).
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/issues/730#issu… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/383665ff… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/5278870a… | x_refsource_MISC |
| https://github.com/advisories/GHSA-mh29-5h37-fv8m |
Impacted products
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CVE-2013-4660 (GCVE-0-2013-4660)
Vulnerability from nvd – Published: 2013-06-28 14:00 – Updated: 2024-09-17 02:11
VLAI
EPSS
VEX
Summary
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://nealpoole.com/blog/2013/06/code-execution… | x_refsource_MISC |
| http://portal.nodesecurity.io/advisories/js-yaml | x_refsource_CONFIRM |
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CVE-2026-59868 (GCVE-0-2026-59868)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:18 – Updated: 2026-07-09 13:42
VLAI
EPSS
VEX
Title
js-yaml: YAML merge-key chains can force quadratic CPU consumption
Summary
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in version 5.2.0.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/3105455b… | x_refsource_MISC |
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CVE-2026-59869 (GCVE-0-2026-59869)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:15 – Updated: 2026-07-09 15:14
VLAI
EPSS
VEX
Title
js-yaml: YAML merge-key chains can force quadratic CPU consumption
Summary
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/24f13e79… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/59423c6f… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/3.15.0 | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/4.3.0 | x_refsource_MISC |
Impacted products
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CVE-2026-59870 (GCVE-0-2026-59870)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:13 – Updated: 2026-07-08 15:50
VLAI
EPSS
VEX
Title
js-yaml quadratic-complexity denial of service via YAML11_SCHEMA !!omap parsing
Summary
js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/commit/39f3211a… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/5.2.1 | x_refsource_MISC |
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CVE-2026-53550 (GCVE-0-2026-53550)
Vulnerability from cvelistv5 – Published: 2026-06-22 14:59 – Updated: 2026-06-29 15:06
VLAI
EPSS
VEX
Title
js-yaml: Quadratic-complexity DoS in merge key handling via repeated aliases
Summary
js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
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CVE-2025-64718 (GCVE-0-2025-64718)
Vulnerability from cvelistv5 – Published: 2025-11-13 15:32 – Updated: 2026-01-29 22:08
VLAI
EPSS
VEX
Title
js-yaml has prototype pollution in merge (<<)
Summary
js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (`__proto__`). All users who parse untrusted yaml documents may be impacted. The problem is patched in js-yaml 4.1.1 and 3.14.2. Users can protect against this kind of attack on the server by using `node --disable-proto=delete` or `deno` (in Deno, pollution protection is on by default).
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/issues/730#issu… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/383665ff… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/5278870a… | x_refsource_MISC |
| https://github.com/advisories/GHSA-mh29-5h37-fv8m |
Impacted products
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CVE-2013-4660 (GCVE-0-2013-4660)
Vulnerability from cvelistv5 – Published: 2013-06-28 14:00 – Updated: 2024-09-17 02:11
VLAI
EPSS
VEX
Summary
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://nealpoole.com/blog/2013/06/code-execution… | x_refsource_MISC |
| http://portal.nodesecurity.io/advisories/js-yaml | x_refsource_CONFIRM |
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