Integer underflow in crypto_sign_open() leads to buffer overflow
Priority LOW 36CWE-121Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0034 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| CROSS-signature | CROSS-implementation | < fc6b7e78cdf789bb5c395a81dc601356f1383da0 | — | No fix listed | CNA |
- CROSS-implementation VendorCROSS-signature Affected < fc6b7e78cdf789bb5c395a81dc601356f1383da0 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cross-crypto:cross-implementation:*:*:*:*:*:*:*:* | before 2026-03-23 | Vulnerable | Cross-crypto |
- cpe:2.3:a:cross-crypto:cross-implementation:*:*:*:*:*:*:*:* Versions before 2026-03-23 Vulnerable ·Cross-crypto
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-41509
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences