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Servers and applications

CVE-2026-75803

Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty ciphertext can report success without verifying the supplied authentication tag when the operation is finalized by calling the EVP_Cipher() function. Impact summary: Applications calling EVP_Cipher() on an empty ciphertext and expecting the call to check the AEAD tag may accept forged messages. CWE: CWE-354 (Improper…

Severity
Critical 9.1
Published
25 Aug 2026
Last changed
11 Sept 2026
Added to UpHeron
21 Oct 2026
Fixed in
3.0.22, 3.4.7, 3.5.8, 3.6.4, 4.0.2
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • From 3.0.0 before 3.0.22
  • From 3.4.0 before 3.4.7
  • From 3.5.0 before 3.5.8
  • From 3.6.0 before 3.6.4
  • From 4.0.0 before 4.0.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-75803
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-75803