CVE-2026-41565

Description

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.

PUBLISHED Reserved 2026-04-21 | Published 2026-05-28 | Updated 2026-05-29 | Assigner CPANSec

Problem types

CWE-121 Stack-based Buffer Overflow

Product status

Timeline

References

www.openwall.com/lists/oss-security/2026/05/28/10

github.com/...57e69e541b0718ca8724c2f61514322a2d859bc1.patch patch

github.com/...7e56347d420aaf43b2ee1586f4a230492ccf1642.patch patch

metacpan.org/release/MIK/CryptX-0.088_001 release-notes

cve.org (CVE-2026-41565)

nvd.nist.gov (CVE-2026-41565)

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