# CVE-2026-118776: Forge: Incomplete PKCS#7 padding validation in AES/DES CBC and ECB decryption

Status: published. Published: 2026-10-29. Updated: 2026-11-04.

Forge (also called node-forge) is a native implementation of Transport Layer Security in JavaScript. Prior to 1.4.1, the affected implementation used decipher.finish(), CBC and ECB modes, PKCS#7 padding to process the relevant input or security decision. node-forge validated only the final byte of PKCS#7 padding during CBC and ECB decryption and accepted zero, oversized, or mismatched padding bytes. Malformed ciphertext could consequently be accepted and up to four plaintext blocks could be silently removed, causing an integrity failure in applications that treated successful decryption as proof of valid padding. This issue is fixed in version 1.4.1.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- digitalbazaar / forge: < 1.4.1 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-03; percentile 2.69%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-20, CWE-354

## Exploit evidence

- exploit: https://github.com/digitalbazaar/forge/security/advisories/GHSA-2vgq-wchc-25w7 (ADP: CISA-ADP)

## References

- https://github.com/digitalbazaar/forge/security/advisories/GHSA-2vgq-wchc-25w7 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/digitalbazaar/forge/commit/81774ff99e2da64aec9a43591df45a360040c136 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/digitalbazaar/forge/releases/tag/v1.4.1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/digitalbazaar/forge/security/advisories/GHSA-2vgq-wchc-25w7 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-118776; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118776; retrieved 2026-11-04; source updated Not reported

Revision: 37f31bce83e389a49bd5a2941f51a4b6b6d6d808e91580b24c9989965b78ba7b

Canonical: https://y2.dev/cve/CVE-2026-118776

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