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Vulnerabilities

Vulnerability · CVE-2026-41509

CROSS implementation contains reference and optimized implementations of the CROSS post-quantum signature algorithm.

Published May 8, 2026 · catalog updated Jun 17, 2026 · CROSS implementation contains reference

Check if you run it

No confirmed exploitation is on record for CVE-2026-41509. EPSS is 0.60%. Act only if a listed version of CROSS implementation contains reference is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (CROSS implementation contains reference).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.60%
Remediation
Advisory link
Affected products
cpe cross-crypto/cross-implementation

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cross-crypto/cross-implementationversion unspecified

How to fix CVE-2026-41509

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-41509. EPSS is 0.60%. Act only if a listed version of CROSS implementation contains reference is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow; CWE-122: Heap-based Buffer Overflow. EPSS 0.60%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 8, 2026 · NIST NVD

    Detected

    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.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-41509

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-41509

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-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 fc6b7e

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.