SB2026050553 - Multiple vulnerabilities in rust-openssl

Description

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2026-42327)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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.

2) Heap-based buffer overflow (CVE-ID: CVE-2026-44662)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause heap corruption.

The vulnerability exists due to a heap-based buffer overflow in CipherCtxRef::cipher_update, CipherCtxRef::cipher_update_vec, and symm::Crypter::update when encrypting non-multiple-of-8 input with AES key-wrap-with-padding ciphers. A remote attacker can supply attacker-influenced plaintext length to cause heap corruption.

This only impacts applications using AES key-wrap-with-padding ciphers.

Remediation

Install update from vendor's website.

References

• https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-xp3w-r5p5-63rr
• https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-xv59-967r-8726