CVE-2026-39864

Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7.

CVSS v3 4.4 MEDIUM

4.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 0.7 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/kamailio/kamailio/security/advisories/GHSA-6m86-m342-g48m	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:kamailio:kamailio::::::::
	cpe:2.3:a:kamailio:kamailio::::::::

History

15 Apr 2026, 16:06

Type	Values Removed	Values Added
CPE		cpe:2.3:a:kamailio:kamailio::::::::
References	~~() https://github.com/kamailio/kamailio/security/advisories/GHSA-6m86-m342-g48m -~~	() https://github.com/kamailio/kamailio/security/advisories/GHSA-6m86-m342-g48m - Vendor Advisory
First Time		Kamailio Kamailio kamailio

08 Apr 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-08 20:16

Updated : 2026-04-15 16:06

NVD link : CVE-2026-39864

Mitre link : CVE-2026-39864

CVE.ORG link : CVE-2026-39864

JSON object : View

Products Affected

kamailio

kamailio

CWE

CWE-125

Out-of-bounds Read

{"id": "CVE-2026-39864", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 0.7}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.2}]}, "published": "2026-04-08T20:16:26.700", "references": [{"url": "https://github.com/kamailio/kamailio/security/advisories/GHSA-6m86-m342-g48m", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7."}], "lastModified": "2026-04-15T16:06:29.670", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DFE6E387-8DDD-4EE6-B837-CEB94BBDE3A4", "versionEndExcluding": "5.8.7"}, {"criteria": "cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "68C6ED5C-A7BF-4C85-B46C-56F3B478B37B", "versionEndExcluding": "6.0.5", "versionStartIncluding": "6.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}