CVE-2026-41565
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.
- Score
- CVSS 3.1 7.5 High
- Status
- Deferred - 9b29abf9-4ab0-4765-b253-1875cd9b441e
- Published
- 2026-05-28
- Last modified
- 2026-10-26
- Weaknesses
- CWE-121
Affected products
References
- 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
- http://www.openwall.com/lists/oss-security/2026/05/28/10
