CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-106804
High (7.5). EPSS 0.6% estimated probability of exploitation activity in the next 30 days.
On this page
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.
Severity
- EPSS
- 0.6% estimated probability of exploitation activity in the next 30 days; 47th percentile. Scored 2026-11-04. A forecast for this CVE across the internet, not for your own systems.
- CWEs
- CWE-20 Improper Input Validation
CWE-120 Buffer Copy without Checking Size of Input (Classic Buffer Overflow)
CWE-121 Stack-based Buffer Overflow - OWASP Top 10
- A05:2025 Injection
- Published
- Modified
- Record from
- the NVD, synced
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Explain CVE-2026-106804 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-106804?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-106804?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-106804 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Ubuntu | 22.04:LTS, 24.04:LTS, 26.04:LTS and 4 more | kamailio | no fix listed | UBUNTU-CVE-2026-106804 |
From the distributions' data via OSV.dev: Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Ubuntu.
Attack patterns (CAPEC)
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-120 (13), CWE-20 (51).