CVE-2026-5479 PUBLISHED

wolfSSL EVP ChaCha20-Poly1305 AEAD authentication tag

Assigner: wolfSSL
Reserved: 03.04.2026 Published: 10.04.2026 Updated: 10.04.2026

In wolfSSL's EVP layer, the ChaCha20-Poly1305 AEAD decryption path in wolfSSL_EVP_CipherFinal (and related EVP cipher finalization functions) fails to verify the authentication tag before returning plaintext to the caller. When an application uses the EVP API to perform ChaCha20-Poly1305 decryption, the implementation computes or accepts the tag but does not compare it against the expected value.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 7.6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	wolfSSL
Product	wolfSSL
Versions	Default: unaffected affected from 0 to 5.9.1 (excl.)

Credits

Calif.io in collaboration with Claude and Anthropic Research finder

References

https://github.com/wolfSSL/wolfssl/pull/10102

Problem Types

CWE-354 Improper Validation of Integrity Check Value CWE