CVE-2026-41509
9.8 · CRITICALOverview
CVE-2026-41509 is a critical-severity vulnerability affecting cross-crypto cross-implementation. It was published on May 8, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from cross-crypto. Update cross-implementation to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| cross-crypto | cross-implementation | >= 0, < 2026-03-23 | Affected |
Frequently Asked Questions
What is CVE-2026-41509?
CVE-2026-41509 is a critical-severity vulnerability affecting cross-crypto cross-implementation. It was published on May 8, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2026-41509?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-41509?
Check the references section for vendor advisories and patches from cross-crypto. Update cross-implementation to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-41509?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-41509 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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