Vulnerability · Published Apr 10, 2026 · Assigned by wolfSSL
CVE-2026-5479wolfSSL EVP ChaCha20-Poly1305 AEAD authentication tag
High 7.6
In plain English
A high-severity security flaw in wolfSSL from wolfSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | wolfssl | 5.9.1-r0 | ALPINE-CVE-2026-5479 |
| Alpine:v3.24 | wolfssl | 5.9.1-r0 | ALPINE-CVE-2026-5479 |
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2026-5479 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2026-5479 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5479 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5479 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-5479 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2026-5479 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2026-5479 |
Affected products (as reported)
Weakness: CWE-354 · 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