PT-2026-37265 · Crates.Io+3 · Openssl+1

Alex · Published 2026-05-05 · Updated 2026-05-15 · CVE-2026-42327

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions rust-openssl versions 0.9.7 through 0.10.78

Description The X509Ref::ocsp responders() function returns OCSP responder URLs from a certificate's AIA extension as OpensslString. The Deref<Target = str> implementation wraps raw bytes using str::from utf8 unchecked. Because OpenSSL does not enforce that the underlying IA5String is ASCII, a certificate containing non-UTF-8 bytes in its OCSP accessLocation can cause safe Rust code to construct a &str that violates the UTF-8 invariant, leading to undefined behavior.

Recommendations Update to version 0.10.79.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-42327

GHSA-XP3W-R5P5-63RR

Affected Products

Openssl

Rust-Openssl

References · 13

• https://ubuntu.com/security/CVE-2026-42327 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-xp3w-r5p5-63rr · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42327 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-42327 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-42327 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-42327 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-42327 · Vendor Advisory
• https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-xp3w-r5p5-63rr · Note
• https://github.com/rust-openssl/rust-openssl · Note
• https://twitter.com/VulmonFeeds/status/2055108697689317684 · Twitter Post
• https://t.me/CVEtracker/53831 · Telegram Post
• https://reddit.com/r/VulnMatter/comments/1t5dfkb/resumen_diario_de_vulnerabilidades_06052026 · Reddit Post
• https://twitter.com/CVEnew/status/2055074232845926690 · Twitter Post