CVE-2026-106803
CVE-2026-106803
A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_registrar_pcscf module. When processing a crafted application/reginfo+xml NOTIFY message, process_contact() copies an attacker-controlled port value from the alias parameter into a fixed 5-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger stack corruption and terminate the P-CSCF process, resulting in denial of service.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| n/a n/a |
Version not specified (affected) | CNA: mitre |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 9.8 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | ADP: CISA-ADP |
Exploit evidence
- https://github.com/kamailio/kamailio/issues/4954
exploit · ADP: CISA-ADP
References
- https://github.com/kamailio/kamailio/issues/4954CNA: mitre
- https://github.com/kamailio/kamailio/pull/4958CNA: mitre
- https://github.com/kamailio/kamailio/commit/21261436492f0014930e804e20586e3833bb91b9CNA: mitre
- https://gist.github.com/hackeryounow/7d7ccc9ec501a5d8c9143b2e1bcc11cbCNA: mitre
- https://github.com/kamailio/kamailio/issues/4954ADP: CISA-ADP · exploit
- https://gist.github.com/hackeryounow/7d7ccc9ec501a5d8c9143b2e1bcc11cb[email protected]
- https://github.com/kamailio/kamailio/commit/21261436492f0014930e804e20586e3833bb91b9[email protected]
- https://github.com/kamailio/kamailio/issues/4954[email protected]
- https://github.com/kamailio/kamailio/pull/4958[email protected]
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