CPANSA-CryptX-2026-41565: CryptX vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-05-28T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-05-28T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 7.5 | Severity | |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability 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.
Vulnerabilities
CVE-2026-41565
Vulnerability 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.
| Weakness | CWE-121 : Stack-based Buffer Overflow |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| CryptX greater than 0 |
|
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-CryptX-2026-41565 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-cryptx-2026-41565.json - https://github.com/DCIT/perl-CryptX/commit/57e69e541b0718ca8724c2f61514322a2d859bc1.patch external
https://github.com/DCIT/perl-CryptX/commit/57e69e541b0718ca8724c2f61514322a2d859bc1.patch - https://github.com/DCIT/perl-CryptX/commit/7e56347d420aaf43b2ee1586f4a230492ccf1642.patch external
https://github.com/DCIT/perl-CryptX/commit/7e56347d420aaf43b2ee1586f4a230492ccf1642.patch - https://metacpan.org/release/MIK/CryptX-0.088_001 external
https://metacpan.org/release/MIK/CryptX-0.088_001 - http://www.openwall.com/lists/oss-security/2026/05/28/10 external
http://www.openwall.com/lists/oss-security/2026/05/28/10 - CVE-2026-41565 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-41565
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Thu May 28 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/