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
CVE-2026-33894 affects the digitalbazaar forge library, a JavaScript implementation of TLS. Before version 1.4.0, the RSASSA PKCS#1 v1.5 signature verification process is flawed for keys with a low public exponent (e=3). The verification accepts forged signatures by allowing extraneous bytes within the ASN.1 structure and does not enforce the minimum 8 bytes of padding required by the specification. This weakness enables attackers to craft signatures that pass verification, effectively allowing signature forgery similar to Bleichenbacher attacks. The vulnerability was addressed in forge version 1.4.0. Red Hat advisories confirm the issue and provide patches for affected products incorporating this library.
Potential Impact
An attacker can forge cryptographic signatures when using vulnerable versions of forge with low public exponent RSA keys. This compromises the integrity of signature verification, potentially allowing unauthorized actions or bypassing authentication mechanisms relying on these signatures. The vulnerability does not affect confidentiality or availability directly but has a high impact on integrity.
Mitigation Recommendations
A fix is available in forge version 1.4.0. Users and vendors should upgrade to version 1.4.0 or later to mitigate this vulnerability. Red Hat has issued security advisories and errata providing patches for affected products that include the vulnerable forge versions. Applying these official updates is the recommended remediation. No additional mitigations are indicated by the vendor advisory.
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
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-33894 affects the digitalbazaar forge library, a JavaScript implementation of TLS. Before version 1.4.0, the RSASSA PKCS#1 v1.5 signature verification process is flawed for keys with a low public exponent (e=3). The verification accepts forged signatures by allowing extraneous bytes within the ASN.1 structure and does not enforce the minimum 8 bytes of padding required by the specification. This weakness enables attackers to craft signatures that pass verification, effectively allowing signature forgery similar to Bleichenbacher attacks. The vulnerability was addressed in forge version 1.4.0. Red Hat advisories confirm the issue and provide patches for affected products incorporating this library.
Potential Impact
An attacker can forge cryptographic signatures when using vulnerable versions of forge with low public exponent RSA keys. This compromises the integrity of signature verification, potentially allowing unauthorized actions or bypassing authentication mechanisms relying on these signatures. The vulnerability does not affect confidentiality or availability directly but has a high impact on integrity.
Mitigation Recommendations
A fix is available in forge version 1.4.0. Users and vendors should upgrade to version 1.4.0 or later to mitigate this vulnerability. Red Hat has issued security advisories and errata providing patches for affected products that include the vulnerable forge versions. Applying these official updates is the recommended remediation. No additional mitigations are indicated by the vendor advisory.
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: 07/30/2026, 01:40:18 UTC
Last updated: 07/31/2026, 21:26:48 UTC
Views: 173
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