What is CVE-2019-9154?

CVE-2019-9154 is a high-severity vulnerability in Openpgpjs, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2019-08-22.

How severe is CVE-2019-9154?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Openpgpjs

CVE-2019-9154

Improper Verification of a Cryptographic Signature in OpenPGP.js <=4.1.2 allows an attacker to pass off unsigned data as signed.

Published 2019-08-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.016 (75.8th percentile), scored 2026-10-26.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Openpgpjs

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-openpgp-js/ (Exploit, Third Party Advisory)
www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/Publications/Studies/Mailvelope_Ext… (Third Party Advisory)
github.com/openpgpjs/openpgpjs/releases/tag/v4.2.0 (Release Notes)
github.com/openpgpjs/openpgpjs/pull/797 (Third Party Advisory)
github.com/openpgpjs/openpgpjs/pull/797/commits/47138eed61473e13ee8f05931119d3e… (Patch, Third Party Advisory)
packetstormsecurity.com/files/154191/OpenPGP.js-4.2.0-Signature-Bypass-Invalid-… (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2019-9154?: CVE-2019-9154 is a high-severity vulnerability in Openpgpjs, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2019-08-22.
How severe is CVE-2019-9154?: High severity. CVSS v3 base score is 7.5 out of 10.