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Vulnerability · Published Mar 27, 2026 · Assigned by GitHub_M

CVE-2026-33894Forge has signature forgery in RSA-PKCS due to ASN.1 extra field

High 7.5

In plain English

A high-severity improper input validation in forge from digitalbazaar. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 58.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:22.04:LTSnode-node-forgeno fix listedUBUNTU-CVE-2026-33894
npmnode-forgeno fix listedGHSA-86w9-cpqp-85rv
npmnode-forge1.4.0GHSA-ppp5-5v6c-4jwp

Affected products (as reported)

VendorProductVersions
digitalbazaar forge < 1.4.0

Weakness: CWE-347, CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References