Secuno
ENNL
Book demo

CVE-2026-41509

Cross-crypto Cross-implementation buffer overflow

9.8 CRITICALEPSS 0.60%
  1. Published8 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Cross-crypto Cross-implementation< 2026-03-23

Remediation

Fixed in
Cross-crypto Cross-implementation≥ 2026-03-23

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-10910910.0
A vulnerability was detected in Wavlink WL-WN530BE1-A 251117. This vulnerability…
CVE-2026-854578.1
IBM Planning Analytics 2.0, and 2.1 could allow a remote authenticated attacker to…
CVE-2026-962668.2
IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability…
CVE-2026-962648.2
IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability…
CVE-2026-962638.2
IBM Power Systems Firmware FW1120.00 through FW1120.01, FW1110.00 through FW1110.31,…
CVE-2026-962628.2
IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability…

Frequently asked

Is CVE-2026-41509 being actively exploited?

CVE-2026-41509 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.60%.

How severe is CVE-2026-41509?

CVE-2026-41509 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.60% probability of exploitation.

Which products are affected by CVE-2026-41509?

Affected products include Cross-crypto Cross-implementation.

How do I fix CVE-2026-41509?

Upgrade affected software to a fixed version, for example Cross-crypto Cross-implementation 2026-03-23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-41509 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.