CVE-2026-33894
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.47% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-347
- Affected
- digitalbazaar/forge
- Source
- security-advisories@github.com
References
- https://datatracker.ietf.org/doc/html/rfc2313#section-8Third Party Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwpVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.