CVE-2026-41565 CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers
A stack buffer overflow in CryptX AEAD helpers allows attackers to execute arbitrary code or cause denial of service via long authentication tags.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41565?
CVE-2026-41565 is a high-severity memory corruption vulnerability in MIK CryptX, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-41565?
Linux distribution packages (1)
perl-CryptX openSUSE:Tumbleweed | All versions | 0.89.0-2.1 |
How do I fix CVE-2026-41565?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-41565 being exploited?
There is no known exploitation of CVE-2026-41565 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-41565, GHSA-4p3p-7392-hjw4, UBUNTU-CVE-2026-41565, openSUSE-SU-2026:10968-1.