ChaCha20-Poly1305 AEAD Vulnerability in wolfSSL Library
CVE-2026-5479

7.6HIGH

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
10 April 2026

What is CVE-2026-5479?

A security flaw exists in the EVP layer of the wolfSSL library, specifically within the ChaCha20-Poly1305 AEAD decryption process. The implementation fails to validate the authentication tag during the decryption process, potentially allowing malicious actors to manipulate data without detection. When applications utilize the EVP API for decryption, the failure to compare the computed tag against the expected value exposes the system to unauthorized access and data integrity issues. Proper mitigations and security patches are crucial for protecting applications utilizing this cryptographic library.

Affected Version(s)

wolfSSL 0 < 5.9.1

References

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

CVSS V4

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Calif.io in collaboration with Claude and Anthropic Research
.