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CVE-2026-33896 Digitalbazaar CVE debrief

CVE-2026-33896 is a high-severity vulnerability in the Forge (node-forge) library, a native implementation of Transport Layer Security in JavaScript. The vulnerability exists in the `pki.verifyCertificateChain()` function, which does not enforce RFC 5280 basicConstraints requirements when an intermediate certificate lacks both the `basicConstraints` and `keyUsage` extensions. This allows any leaf certificate (without these extensions) to act as a CA and sign other certificates, which node-forge will accept as valid. The issue was patched in version 1.4.0. Users of Forge (node-forge) should update to version 1.4.0 or later to mitigate this vulnerability. Evidence suggests that this vulnerability may be exploited in the wild, and defenders should prioritize patching vulnerable systems.

Vendor
Digitalbazaar
Product
Forge
CVSS
HIGH 7.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-27
Original CVE updated
2026-09-04
Advisory published
2026-03-27
Advisory updated
2026-09-04

Who should care

Developers and administrators using the Forge (node-forge) library in their applications should be aware of this vulnerability and take steps to mitigate it. This includes updating to version 1.4.0 or later, and reviewing certificate chains for potential issues. Additionally, defenders should monitor for potential exploitation attempts and review their systems for signs of compromise.

Technical summary

The vulnerability exists in the `pki.verifyCertificateChain()` function of the Forge (node-forge) library. The function does not properly enforce RFC 5280 basicConstraints requirements when an intermediate certificate lacks both the `basicConstraints` and `keyUsage` extensions. This allows an attacker to create a malicious certificate chain that can be accepted as valid by node-forge. The issue is patched in version 1.4.0, which adds proper enforcement of basicConstraints requirements. The vulnerability has a CVSS score of 7.4 and is considered high-severity.

Defensive priority

High

Recommended defensive actions

  • Update to version 1.4.0 or later of the Forge (node-forge) library
  • Review certificate chains for potential issues
  • Monitor for potential exploitation attempts
  • Review systems for signs of compromise
  • Implement additional security controls, such as certificate pinning

Evidence notes

The vulnerability was reported by an unknown researcher and patched by the vendor. The CVE record and NVD detail provide additional information on the vulnerability. The source item URL provides additional metadata on the vulnerability, including references to related advisories and patches.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-33896 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-33896

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-33896 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-33896

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://github.com/digitalbazaar/forge/commit/2e492832fb25227e6b647cbe1ac981c123171e90

    [email protected] - Patch

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://github.com/digitalbazaar/forge/security/advisories/GHSA-2328-f5f3-gj25

    [email protected] - Exploit, Vendor Advisory

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:13826

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:24761

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:9742

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/security/cve/CVE-2026-33896

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.