by Kastro
Paper/Archive/CVE-2026-41509

CVE-2026-41509

CROSS-signature CROSS-implementation — Integer underflow in crypto_sign_open() leads to buffer overflow

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
35
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 27.4.274 × 205.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
CROSS-implementation< fc6b7e78cdf789bb5c395a81dc601356f1383da0–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgithub.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cvrefgithub.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0