Integer underflow in crypto_sign_open() leads to buffer overflow_CVE-2026-41509

6.9 / 10

MEDIUM

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

Description

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.

Basic Information

ID CVE-2026-41509

Source GitHub_M

Published May 8, 2026 at 13:47

Affected Product

Vendor CROSS-signature

Product CROSS-implementation

Version < fc6b7e78cdf789bb5c395a81dc601356f1383da0

Affected Versions CROSS-signature CROSS-implementation < fc6b7e78cdf789bb5c395a81dc601356f1383da0

CWE Classification

CWE-121 CWE-122

References

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    "published": "2026-05-08T13:47:17.770Z",
    "modified": "2026-05-08T13:47:17.770Z",
    "type": "cve",
    "title": "Integer underflow in crypto_sign_open() leads to buffer overflow",
    "source": "GitHub_M",
    "references": "https://github.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cv\nhttps://github.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0",
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