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 issue has been patched via commit fc6b7e7.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0	Patch
https://github.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cv	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:cross-crypto:cross-implementation:*:*:*:*:*:*:*:*

History

12 May 2026, 14:15

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8
CPE		cpe:2.3:a:cross-crypto:cross-implementation::::::::
References	~~() https://github.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0 -~~	() https://github.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0 - Patch
References	~~() https://github.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cv -~~	() https://github.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cv - Vendor Advisory
First Time		Cross-crypto Cross-crypto cross-implementation

08 May 2026, 14:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-08 14:16

Updated : 2026-05-12 14:15

NVD link : CVE-2026-41509

Mitre link : CVE-2026-41509

CVE.ORG link : CVE-2026-41509

JSON object : View

Products Affected

cross-crypto

cross-implementation

CWE

CWE-121

Stack-based Buffer Overflow

CWE-122

Heap-based Buffer Overflow

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