Vulnerability-Lookup

FKIE_CVE-2026-33938

Vulnerability from fkie_nvd - Published: 2026-03-27 21:17 - Updated: 2026-09-04 13:19

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the `@partial-block` special variable is stored in the template data context and is reachable and mutable from within a template via helpers that accept arbitrary objects. When a helper overwrites `@partial-block` with a crafted Handlebars AST, a subsequent invocation of `{{> @partial-block}}` compiles and executes that AST, enabling arbitrary JavaScript execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. First, use the runtime-only build (`require('handlebars/runtime')`). The `compile()` method is absent, eliminating the vulnerable fallback path. Second, audit registered helpers for any that write arbitrary values to context objects. Helpers should treat context data as read-only. Third, avoid registering helpers from third-party packages (such as `handlebars-helpers`) in contexts where templates or context data can be influenced by untrusted input.

References

URL	Tags
security-advisories@github.com	https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2	Patch
security-advisories@github.com	https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9	Release Notes
security-advisories@github.com	https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-3mfm-83xf-c92r	Exploit, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:10175
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34342
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-33938
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2452525
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-3mfm-83xf-c92r	Exploit, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33938.json

Impacted products

	Vendor	Product	Version
	handlebarsjs	handlebars	*

JSON

To clipboard

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          "defaultStatus": "unaffected",
          "packageName": "rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9",
          "product": "Red Hat OpenShift AI (RHOAI)",
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          "packageName": "devspaces/dashboard-rhel9",
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    }
  ],
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  "lastModified": "2026-09-04T13:19:25.910",
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CVE-2026-33938 (GCVE-0-2026-33938)

Vulnerability from cvelistv5 – Published: 2026-03-27 21:05 – Updated: 2026-09-04 12:04

Title

Handlebars.js has JavaScript Injection via AST Type Confusion by tampering @partial-block

Summary

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-31 00:00 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')
CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

Assigner

GitHub_M mitre root

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-2026-33938	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2452525	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
handlebars-lang	handlebars.js	Affected: >= 4.0.0, < 4.7.9
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

Show details on NVD website

JSON

To clipboard

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            "product": "Cryostat 4",
            "vendor": "Red Hat"
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            "cpes": [
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            "cpes": [
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            "cpes": [
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            "defaultStatus": "unaffected",
            "packageName": "mozjs60",
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            "vendor": "Red Hat"
          },
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          },
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            "packageName": "devspaces/dashboard-rhel9",
            "product": "Red Hat OpenShift Dev Spaces",
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          ],
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        "discovery": "UNKNOWN"
      },
      "title": "Handlebars.js has JavaScript Injection via AST Type Confusion by tampering @partial-block"
    }
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    "dateReserved": "2026-03-24T19:50:52.103Z",
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}

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.

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.

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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FKIE_CVE-2026-33938

CVE-2026-33938 (GCVE-0-2026-33938)

Tags

Sightings

Nomenclature

Related by attack behaviour