CVE•Published 2026-05-08•Modified 2026-05-12•1 article on news•5 live references•NVD data
CVE-2026-41509Cross-crypto · Cross-implementation
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
—
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.
Timeline
Published 2026-05-08
Modified 2026-05-12
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-41509Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Cross-crypto Cross-implementation"All exposed Cross-crypto Cross-implementation instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Cross-implementation"HTTP body or banner mentions "Cross-implementation" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-41509Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-41509Censys host search filtered to this CVE id.
grep.app
CVE-2026-41509Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-41509GitHub code search for direct mentions.
Google dork
"CVE-2026-41509" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-41509 on GitHub.