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Fencer Vulns
high 7.5

CVE-2026-39863 json

Kamailio Core: TCP Data Processing Vulnerability

published 2026-04-08 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-20616

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.1.1, 6.0.6, and 5.8.8, an out-of-bounds access in the core of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted data packet sent over TCP. The issue impacts Kamailio instances having TCP or TLS listeners. This vulnerability is fixed in 5.1.1, 6.0.6, and 5.8.8.

Patch / fix

  • kamailio kamailio 5.8.8, 6.0.6, 6.1.1
  • kamailio Debian 13 6.0.1-1+deb13u2
  • kamailio Debian 14 6.1.1-2

debian advisories DEBIAN-CVE-2026-39863

  • kamailio Alpine 3.14 5.4.5-r2
  • kamailio Alpine 3.21, Alpine 3.20 5.8.8-r0
  • kamailio Alpine 3.24, Alpine 3.23, Alpine 3.22 6.0.6-r0

alpine advisories ALPINE-CVE-2026-39863

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • kamailio kamailio

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.