Buffer overflow in Cross-crypto Cross-implementation
CVE-2026-41509
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…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (19.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Cross-crypto Cross-implementation
- Cross-signature Cross-implementation — versions < fc6b7e78cdf789bb5c395a81dc601356f1383da0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-41509?
- CVE-2026-41509 is a critical-severity vulnerability in Cross-crypto Cross-implementation, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-05-08.
- How severe is CVE-2026-41509?
- Critical severity. CVSS v3 base score is 9.8 out of 10.