Bug 2482740 (CVE-2026-41565)

Summary: CVE-2026-41565 perl-CryptX: perl-CryptX: Stack buffer overflow allows arbitrary code execution via a crafted authentication tag.
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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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.
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Bug Depends On: 2482787, 2482788    
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Description OSIDB Bzimport 2026-05-28 16:02:07 UTC 
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.