CVE-2026-41565

Summary

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.

Affected Software

Weaknesses

• CWE-121: CWE-121 Stack-based Buffer Overflow

ADP Enrichment

CVE Program Container

Additional References

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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

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

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