CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers

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Summary

CVECVE-2026-41565
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 16:16:22 UTC
Updated2026-05-29 15:29:42 UTC
DescriptionCryptX 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.

Risk And Classification

Problem Types: CWE-121 | CWE-121 CWE-121 Stack-based Buffer Overflow

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA MIK CryptX affected 0.088_001 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/05/28/10 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/DCIT/perl-CryptX/commit/7e56347d420aaf43b2ee1586f4a230492ccf1... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/MIK/CryptX-0.088_001 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/DCIT/perl-CryptX/commit/57e69e541b0718ca8724c2f61514322a2d859... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-04-21T00:00:00.000ZIssue reported.
CNA2026-04-23T00:00:00.000ZVersion 0.088 released with fix for gcm_decrypt_verify.
CNA2026-04-28T00:00:00.000ZVersion 0.088_001 released with fixes for the remaining three helpers.

Solutions

CNA: Upgrade to CryptX 0.088_001 or later.

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