CVE-2026-33937 (GCVE-0-2026-33937)
Vulnerability from cvelistv5 – Published: 2026-03-27 21:03 – Updated: 2026-09-04 12:04
VLAI
EPSS
VEX
Title
Handlebars.js has JavaScript Injection via AST Type Confusion
Summary
Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `Handlebars.compile()` accepts a pre-parsed AST object in addition to a template string. The `value` field of a `NumberLiteral` AST node is emitted directly into the generated JavaScript without quoting or sanitization. An attacker who can supply a crafted AST to `compile()` can therefore inject and execute arbitrary JavaScript, leading to Remote Code Execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. Validate input type before calling `Handlebars.compile()`; ensure the argument is always a `string`, never a plain object or JSON-deserialized value. Use the Handlebars runtime-only build (`handlebars/runtime`) on the server if templates are pre-compiled at build time; `compile()` will be unavailable.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-31 00:00 UTC
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/handlebars-lang/handlebars.js/… | x_refsource_CONFIRM |
| https://github.com/handlebars-lang/handlebars.js/… | x_refsource_MISC |
| https://github.com/handlebars-lang/handlebars.js/… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-33937 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2452523 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:34342 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:10175 | vendor-advisoryx_refsource_REDHAT |
Impacted products
16 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| handlebars-lang | handlebars.js |
Affected:
>= 4.0.0, < 4.7.9
|
guessed | |
| Red Hat | Cluster Observability Operator 1.5.0 |
Unaffected:
1782839279 , < *
(rpm)
cpe:/a:redhat:cluster_observability_operator:1.5::el9 |
||
| Red Hat | Cluster Observability Operator 1.5.0 |
Unaffected:
1782840539 , < *
(rpm)
cpe:/a:redhat:cluster_observability_operator:1.5::el9 |
||
| Red Hat | Cluster Observability Operator 1.5.0 |
Unaffected:
1782839996 , < *
(rpm)
cpe:/a:redhat:cluster_observability_operator:1.5::el9 |
||
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 |
Unaffected:
1776744110 , < *
(rpm)
cpe:/a:redhat:openshift_devspaces:3.27::el9 |
||
| Red Hat | Cryostat 4 |
cpe:/a:redhat:cryostat:4
|
||
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
|
||
| Red Hat | Red Hat Data Grid 8 |
cpe:/a:redhat:jboss_data_grid:8
|
||
| Red Hat | Red Hat Developer Hub |
cpe:/a:redhat:rhdh:1
|
||
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
||
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
||
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
||
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
||
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai
|
||
| Red Hat | Red Hat OpenShift Dev Spaces |
cpe:/a:redhat:openshift_devspaces:3
|
||
| Red Hat | Red Hat Process Automation 7 |
cpe:/a:redhat:jboss_enterprise_bpms_platform:7
|
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{
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"attackVector": "NETWORK",
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"baseScore": 9.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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}
],
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"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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},
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"name": "RHBZ#2452523",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452523"
},
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"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33937.json"
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{
"tags": [
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"url": "https://access.redhat.com/errata/RHSA-2026:34342"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:10175"
}
],
"solutions": [
{
"lang": "en",
"value": "RHSA-2026:34342: Cluster Observability Operator 1.5.0"
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{
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"value": "RHSA-2026:10175: Red Hat OpenShift Dev Spaces 3.27"
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],
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"value": "Reported to Red Hat."
},
{
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"time": "2026-03-27T21:03:46.748Z",
"value": "Made public."
}
],
"title": "handlebars.js: Handlebars: Remote Code Execution via crafted Abstract Syntax Tree object in compile()",
"workarounds": [
{
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"value": "To mitigate this issue, ensure that any input provided to the `Handlebars.compile()` function is strictly validated to be a string type, preventing the injection of crafted Abstract Syntax Tree (AST) objects. Additionally, for deployments where templates are pre-compiled at build time, consider utilizing the Handlebars runtime-only build (`handlebars/runtime`). This build variant does not include the `compile()` function, thereby eliminating the attack vector. If the application is a service, a restart may be required for the changes to take effect."
}
],
"x_adpType": "supplier",
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"Technical Impact": "total"
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],
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"timestamp": "2026-03-31T14:23:06.857073Z",
"version": "2.0.3"
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}
],
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
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"descriptions": [
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"cweId": "CWE-843",
"description": "CWE-843: Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)",
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]
},
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{
"name": "https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2w6w-674q-4c4q",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2w6w-674q-4c4q"
},
{
"name": "https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2",
"tags": [
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],
"url": "https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2"
},
{
"name": "https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9",
"tags": [
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],
"url": "https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9"
}
],
"source": {
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"discovery": "UNKNOWN"
},
"title": "Handlebars.js has JavaScript Injection via AST Type Confusion"
}
},
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"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-33937",
"datePublished": "2026-03-27T21:03:46.748Z",
"dateReserved": "2026-03-24T19:50:52.103Z",
"dateUpdated": "2026-09-04T12:04:45.273Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
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}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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