CVE-2026-41509CWE-121CWE-122

Integer underflow in crypto_sign_open() leads to buffer overflow

Medium · published May 8, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
47.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
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
EPSS
0.00598 · 47.9th percentile
Weaknesses
CWE-121 · Stack-based Buffer Overflow; CWE-122 · Heap-based Buffer Overflow
Published
2026-05-08T13:47Z
EPSS history
Timeline
  • 08 MAY 13:47Z
    Integer underflow in crypto_sign_open() leads to buffer overflow
    cvelistv5