Improper Validation of Integrity Check Value Affecting openssl package, versions [3.4.0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-CONAN-OPENSSL-17277226
- published10 Jun 2026
- disclosed9 Jun 2026
- creditPavol Žáčik
Introduced: 9 Jun 2026
NewCVE-2026-34181 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Improper Validation of Integrity Check Value in PBMAC1_PBKDF2_HMAC(). A user can craft an unencrypted PKCS#12 file that uses PBMAC1 authentication specifying a one-byte HMAC key, causing a service that authenticates incoming files by password to accept the attacker's certificate and private key in 1 of 256 attempts.