Input validation error in rust-openssl - CVE-2026-42327

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Main Vulnerability Database Vulnerabilities #VU129722

Input validation error in rust-openssl - CVE-2026-42327

Published: May 5, 2026


Vulnerability identifier: #VU129722
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-42327
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
rust-openssl
Software vendor:
Steven Fackler

Description

The vulnerability allows a remote attacker to trigger undefined behavior.

The vulnerability exists due to improper handling of non-UTF-8 data in X509Ref::ocsp_responders when parsing OCSP responder URLs from a certificate's AIA extension. A remote attacker can supply a specially crafted certificate to trigger undefined behavior.


Remediation

Install security update from vendor's website.

External links