CVE-2026-33894: CWE-347: Improper Verification of Cryptographic Signature in digitalbazaar forge
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS#1 v1.5 signature verification accepts forged signatures for low public exponent keys (e=3). Attackers can forge signatures by stuffing “garbage” bytes within the ASN structure in order to construct a signature that passes verification, enabling Bleichenbacher style forgery. This issue is similar to CVE-2022-24771, but adds bytes in an addition field within the ASN structure, rather than outside of it. Additionally, forge does not validate that signatures include a minimum of 8 bytes of padding as defined by the specification, providing attackers additional space to construct Bleichenbacher forgeries. Version 1.4.0 patches the issue.
AI Analysis
Technical Summary
Forge (node-forge) versions before 1.4.0 contain a cryptographic signature verification flaw (CWE-347) in the RSASSA PKCS#1 v1.5 implementation. The verification process accepts forged signatures for low public exponent keys (e=3) by allowing extra bytes within the ASN.1 structure and failing to enforce a minimum of 8 bytes of padding as required by the specification. This weakness enables attackers to craft signatures that pass validation, effectively forging signatures and undermining cryptographic integrity. The issue is similar to CVE-2022-24771 but differs in how extra bytes are inserted. The vulnerability is patched in version 1.4.0.
Potential Impact
An attacker can forge cryptographic signatures that appear valid, potentially allowing unauthorized actions that rely on signature verification. This compromises the integrity and authenticity of communications or data protected by the vulnerable forge library. The vulnerability does not impact confidentiality or availability but has a high impact on integrity.
Mitigation Recommendations
Upgrade to forge version 1.4.0 or later, which includes a fix for this signature verification vulnerability. No other effective mitigations are currently available or meet Red Hat's criteria for ease of use and deployment. Users of affected products should apply the official patch or update as soon as possible.
CVE-2026-33894: CWE-347: Improper Verification of Cryptographic Signature in digitalbazaar forge
Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS#1 v1.5 signature verification accepts forged signatures for low public exponent keys (e=3). Attackers can forge signatures by stuffing “garbage” bytes within the ASN structure in order to construct a signature that passes verification, enabling Bleichenbacher style forgery. This issue is similar to CVE-2022-24771, but adds bytes in an addition field within the ASN structure, rather than outside of it. Additionally, forge does not validate that signatures include a minimum of 8 bytes of padding as defined by the specification, providing attackers additional space to construct Bleichenbacher forgeries. Version 1.4.0 patches the issue.
CVSS v3.1
Score 7.5high
Affected software
digitalbazaar
forge
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Forge (node-forge) versions before 1.4.0 contain a cryptographic signature verification flaw (CWE-347) in the RSASSA PKCS#1 v1.5 implementation. The verification process accepts forged signatures for low public exponent keys (e=3) by allowing extra bytes within the ASN.1 structure and failing to enforce a minimum of 8 bytes of padding as required by the specification. This weakness enables attackers to craft signatures that pass validation, effectively forging signatures and undermining cryptographic integrity. The issue is similar to CVE-2022-24771 but differs in how extra bytes are inserted. The vulnerability is patched in version 1.4.0.
Potential Impact
An attacker can forge cryptographic signatures that appear valid, potentially allowing unauthorized actions that rely on signature verification. This compromises the integrity and authenticity of communications or data protected by the vulnerable forge library. The vulnerability does not impact confidentiality or availability but has a high impact on integrity.
Mitigation Recommendations
Upgrade to forge version 1.4.0 or later, which includes a fix for this signature verification vulnerability. No other effective mitigations are currently available or meet Red Hat's criteria for ease of use and deployment. Users of affected products should apply the official patch or update as soon as possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-24T15:41:47.489Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-33894","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:24761","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:9742","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:13826","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:22629","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:21017","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:24853","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:19375","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:22465","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:22840","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:23361","vendor":"Red Hat"}]
Threat ID: 69c6efce3c064ed76ff462e5
Added to database: 03/27/2026, 20:59:58 UTC
Last enriched: 08/14/2026, 14:42:33 UTC
Last updated: 09/12/2026, 22:13:36 UTC
Views: 216
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