PT-2026-38965 · Cross · Cross

Iiviel · CVE-2026-41509 · Published 2026-05-08 · Updated 2026-05-08

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions CROSS versions prior to commit fc6b7e7

Description A buffer overflow exists in the crypto sign open() function caused by an underflow of the mlen integer. This occurs within the reference and optimized implementations of the CROSS post-quantum signature algorithm.

Recommendations Update to the version containing commit fc6b7e7.

Exploit

Fix

Heap Based Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-122

CWE-121

Related Identifiers

CVE-2026-41509

GHSA-W72C-HGX8-P7CV

Affected Products

Cross

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41509.json · Exploit
• https://github.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cv · Vendor Advisory
• https://github.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-41509 · Security Note
• https://osv.dev/vulnerability/CVE-2026-41509 · Vendor Advisory
• https://twitter.com/CVEnew/status/2052811024114262081 · Twitter Post