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

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-33894
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-27 21:17:25 UTC
Updated2026-03-30 13:26:07 UTC
DescriptionForge (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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.000290000 probability, percentile 0.081400000 (date 2026-04-01)

Problem Types: CWE-20 | CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature | CWE-20 CWE-20: Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Digitalbazaar Forge affected < 1.4.0 Not specified

References

ReferenceSourceLinkTags
github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwp [email protected] github.com
www.rfc-editor.org/rfc/rfc8017.html [email protected] www.rfc-editor.org
datatracker.ietf.org/doc/html/rfc2313 [email protected] datatracker.ietf.org
mailarchive.ietf.org/arch/msg/openpgp/5rnE9ZRN1AokBVj3VqblGlP63QE [email protected] mailarchive.ietf.org
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