CVE-2026-33941 (GCVE-0-2026-33941)
Vulnerability from cvelistv5 – Published: 2026-03-27 21:13 – Updated: 2026-09-11 12:09
VLAI
EPSS
VEX
Title
Handlebars.js has JavaScript Injection in CLI Precompiler via Unescaped Names and Options
Summary
Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the Handlebars CLI precompiler (`bin/handlebars` / `lib/precompiler.js`) concatenates user-controlled strings — template file names and several CLI options — directly into the JavaScript it emits, without any escaping or sanitization. An attacker who can influence template filenames or CLI arguments can inject arbitrary JavaScript that executes when the generated bundle is loaded in Node.js or a browser. Version 4.7.9 fixes the issue. Some workarounds are available. First, validate all CLI inputs before invoking the precompiler. Reject filenames and option values that contain characters with JavaScript string-escaping significance (`"`, `'`, `;`, etc.). Second, use a fixed, trusted namespace string passed via a configuration file rather than command-line arguments in automated pipelines. Third, run the precompiler in a sandboxed environment (container with no write access to sensitive paths) to limit the impact of successful exploitation. Fourth, audit template filenames in any repository or package that is consumed by an automated build pipeline.
Severity
8.3 (High)
SSVC
Exploitation: poc
Automatable: no
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-2026-33941 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2452524 | 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
15 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 Process Automation 7 |
cpe:/a:redhat:jboss_enterprise_bpms_platform:7
|
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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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