Riskcovery

CVE-2026-33894

Forge has signature forgery in RSA-PKCS due to ASN.1 extra field

State
Published
Severity
7.5 High
Published
Mar 27, 2026
Updated
Sep 10, 2026
Reserved
Mar 24, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NGitHub_M
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nredhat-SADP

Weaknesses

  • CWE-347 Improper Verification of Cryptographic Signature
  • CWE-20 Improper Input Validation

Affected Products

ProductVersions
forgedigitalbazaar
  • < 1.4.0Affected

References

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