Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-05-28T14:13:19 perl-CryptX: perl-CryptX: Stack buffer overflow allows arbitrary code execution via a crafted authentication tag. 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CWE-120

CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers. The gcm_decrypt_verify, ccm_decrypt_verify, chacha20poly1305_decrypt_verify and eax_decrypt_verify XS routines copied the caller-supplied authentication tag into a fixed 144-byte stack buffer (MAXBLOCKSIZE) without checking the supplied length. A longer tag overwrites the stack past the buffer. Version 0.088 added the clamp to gcm_decrypt_verify, and 0.088_001 added it to the other three. Any caller of an affected helper that forwards an attacker-controlled tag longer than the buffer can trigger the overflow.

A flaw was found in perl-CryptX. A stack buffer overflow vulnerability exists in the AEAD (Authenticated Encryption with Associated Data) decrypt_verify helper routines. An attacker who can control the length of the authentication tag provided to these routines can cause a buffer overflow, potentially leading to arbitrary code execution or a denial of service.

This IMPORTANT stack buffer overflow in perl-CryptX affects four AEAD decrypt_verify helpers. Exploitation requires no authentication and can be network-accessible if applications process untrusted cryptographic input. Impact is high to confidentiality, integrity, and availability through potential arbitrary code execution. Fixed in versions 0.088 (gcm) and 0.088_001 (ccm, chacha20poly1305, eax). https://www.cve.org/CVERecord?id=CVE-2026-41565 https://nvd.nist.gov/vuln/detail/CVE-2026-41565 https://github.com/DCIT/perl-CryptX/commit/57e69e541b0718ca8724c2f61514322a2d859bc1.patch https://github.com/DCIT/perl-CryptX/commit/7e56347d420aaf43b2ee1586f4a230492ccf1642.patch https://metacpan.org/release/MIK/CryptX-0.088_001