CVE-2026-41509CRITICAL 9.8EPSS p25.6%

CVE-2026-41509CVE-2026-41509

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.34% probability of exploitation · percentile 25.6% · 2026-06-18T12:00:27Z
Published2026-05-08
Last modified2026-05-12

Underlying weaknesses· 2

CWE-121CWE-122

References

  1. https://github.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0
  2. https://github.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cv

2

TypeTargetConfidenceTier
WeaknessStack-based Buffer Overflowcwe-1210%live
WeaknessHeap-based Buffer Overflowcwe-1220%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.