Stack-based buffer overflow in Kamailio ims_qos_npn module
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-120 and the CVSS impact.
Summary
Kamailio v6.1.3 and v6.1.4 in the ims_qos_npn module are affected. The w_rx_aar_register() function copies the host field from the SIP Via header into a fixed 46-byte stack buffer without checking its length, which is a stack-based buffer overflow (CWE-121). An unauthenticated remote attacker can corrupt the stack and terminate the affected Kamailio instance, causing denial of service.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Description from the CNA
A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_qos_npn module. The w_rx_aar_register() function copies the attacker-controlled host field from the SIP `Via` header into a fixed 46-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger the vulnerability with a crafted SIP `REGISTER` request, causing stack corruption and termination of the affected Kamailio instance, resulting in denial of service.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Kamailio.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Timeline
- 2026-11-02 Threatist record created from CVE-2026-106804
- 2026-11-02 CVSS score added · CISA ADP
- 2026-11-02 Weakness changed · CISA ADP
- 2026-11-02 CISA SSVC decision points changed
- 2026-11-02 Priority changed: LOW → HIGH
- 2026-11-02 Alias added: GHSA-wm7p-xjpr-gf9g
References
Sources
- CVE-2026-106804 · CVE Program
- CVE-2026-106804 · NVD
- FIRST EPSS
- GHSA-wm7p-xjpr-gf9g · GitHub Advisory Database · CC BY 4.0
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