An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior…
Priority HIGH 66CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.
Summary
An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages leading to unsigned integer overflow.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00873 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- 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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libcoap:libcoap:4.3.4:*:*:*:*:*:*:* | 4.3.4 | Vulnerable | libcoap |
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | 39 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:* | 40 | Vulnerable | Fedoraproject |
- cpe:2.3:a:libcoap:libcoap:4.3.4:*:*:*:*:*:*:* Versions 4.3.4 Vulnerable ·libcoap
- cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:* Versions 40 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2024-31031
- 2026-10-03 Alias added: GHSA-8hrj-6457-w65j
References
Sources
- CVE-2024-31031 · CVE Program
- CVE-2024-31031 · NVD
- FIRST EPSS
- GHSA-8hrj-6457-w65j · GitHub Advisory Database · CC BY 4.0
- CVE-2024-31031 · Red Hat security data · CC BY 4.0
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