CVE-2026-5263

MEDIUM

URI nameConstraints not enforced in ConfirmNameConstraints()

Title source: cna

Description

URI nameConstraints from constrained intermediate CAs are parsed but not enforced during certificate chain verification in wolfcrypt/src/asn.c. A compromised or malicious sub-CA could issue leaf certificates with URI SAN entries that violate the nameConstraints of the issuing CA, and wolfSSL would accept them as valid.

References (2)

Core 2

Core References

https://github.com/wolfSSL/wolfssl/pull/10048

Third Party Advisory

https://www.talosintelligence.com/vulnerability_reports/TALOS-2026-2410

Scores

CVSS v3 6.5

EPSS 0.0017

EPSS Percentile 6.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-295

Status published

Products (2)

wolfSSL/wolfSSL < 5.9.1

wolfssl/wolfssl < 5.9.1

Published Apr 09, 2026

Tracked Since Apr 10, 2026