// For flags

CVE-2026-5479

wolfSSL EVP ChaCha20-Poly1305 AEAD authentication tag

Severity Score

7.6
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

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.

*Credits: Calif.io in collaboration with Claude and Anthropic Research
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
High
None
Integrity
High
None
Availability
None
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2026-04-03 CVE Reserved
  • 2026-04-10 CVE Published
  • 2026-04-22 CVE Updated
  • 2026-05-12 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-354: Improper Validation of Integrity Check Value
CAPEC
References (1)
URL Tag Source
https://github.com/wolfSSL/wolfssl/pull/10102
URL Date SRC
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
WolfSSL
Search vendor "WolfSSL"
 WolfSSL
Search vendor "WolfSSL" for product "WolfSSL"
 < 5.9.1
Search vendor "WolfSSL" for product "WolfSSL" and version " < 5.9.1"
en
Affected