Is CVE-2026-28799 actively exploited?

CVE-2026-28799 has no public evidence of in-the-wild exploitation as of 2026-03-10.

What is the CVSS score for CVE-2026-28799?

CVE-2026-28799 has a CVSS score of 8.7 (HIGH severity). Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-28799?

Patch guidance is available from pjsip security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-28799.

Fix CVE-2026-28799 - HIGH pjsip pjsip

Description

PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a heap use-after-free vulnerability exists in PJSIP's event subscription framework (evsub.c) that is triggered during presence unsubscription (SUBSCRIBE with Expires=0). This issue has been patched in version 2.17.

CVSS Metrics

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-416 · Use After Free

Metadata

Primary Vendor: PJSIP
Published: 3/6/2026
Last Modified: 3/10/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-28799

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary