Improper Validation of Integrity Check Value Affecting openssl package, versions [3.0.5,3.1.0)
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.
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Test your applications- Snyk IDSNYK-CONAN-OPENSSL-19267454
- published26 Aug 2026
- disclosed25 Aug 2026
- creditBilly Brumley (Rochester Institute of Technology)
Introduced: 25 Aug 2026
NewCVE-2026-75803 (opens in a new tab)How to fix?
Upgrade openssl to version 3.1.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Integrity Check Value in the chacha20_poly1305_cipher and aes_ocb_cipher implementations under providers/implementations/ciphers/. An attacker can forge messages by supplying an empty ciphertext and a bad tag, then invoking EVP_Cipher(ctx, out, NULL, 0) so the operation returns success without checking the tag. Applications that treat that successful return as proof of integrity may accept tampered ChaCha20-Poly1305 or AES-OCB messages.