CVE-2026-39863 | BDVDB-2026-325901 Detail

kamailiokamailio

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

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

References#

https://github.com/kamailio/kamailio/security/advisories/GHSA-2wj4-f825-2h2f

Exploit#

No public exploit known

History#

Version 12026-04-08Record published in the CVE List.
Version 22026-04-09Most recent update recorded in the CVE List.

Published

Published: 2026-04-08
Last modified: 2026-04-09

Vendor information

Vendor: kamailio
Product: kamailio

All kamailio vulnerabilities

Score

7.5 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 41.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 5.8.8
Fixed
Not stated
Vulnerable
>= 6.0.0, < 6.0.6
Fixed
Not stated
Vulnerable
>= 6.1.0, < 6.1.1
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).