How serious is CVE-2026-28799?

This vulnerability has a CVSS score of 8.7 out of 10, classified as HIGH severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-28799?

Yes, proof-of-concept exploit code for CVE-2026-28799 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-28799?

CVE-2026-28799 affects pjsip pjsip. Check the full CVE details for specific version information.

How do I fix CVE-2026-28799?

To remediate CVE-2026-28799, check for security patches from pjsip. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-28799

High

|8.7

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows an attacker to potentially execute malicious code on a system using PJSIP by exploiting a flaw in the event subscription process when a user unsubscribes from presence updates. It can be triggered if the attacker can send a specific unsubscribe request, and it has been fixed in version 2.17 of the software.

Technical 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 Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeChanged

Vector String

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

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$4,579($1K-$5K)

Vendor Response

Grade APatched in 4 days

Quick Information

Published

Mar 6, 2026

about 1 month ago

Last Modified

Mar 10, 2026

28 days ago

Vendor

pjsip

Product

pjsip

Related Vulnerabilities

CVE-2026-29068High

This vulnerability allows an attacker to crash the application or potentially execute malicious code by sending specially crafted RTP data that contains more frames than the software can handle. It affects versions prior to 2.17 of the PJSIP library, so using an updated version is crucial to prevent exploitation.