CVE-2026-41509 MEDIUM

CVE-2026-41509: Integer underflow in crypto_sign_open() leads to buffer overflow

Vendor Cross-Signature
Product CROSS-implementation
Weakness CWE-121
Published May 8, 2026
Last update May 8, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

CROSS implementation contains reference and optimized implementations of the CROSS post-quantum signature algorithm. Prior to commit fc6b7e7, there is a buffer overflow in crypto_sign_open() caused by an underflow of the integer mlen. This issue has been patched via commit fc6b7e7.

Key dates

02Disclosure timeline

May 8, 2026 CVE published
May 8, 2026 Record updated