EUVD-2026-13519CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Description
PJSIP is a free and open source multimedia communication library written in C. Versions 2.16 and below have a Heap-based Buffer Overflowvulnerability in the DNS parser's name length handler. Thisimpacts applications using PJSIP's built-in DNS resolver, such as those configured with pjsua_config.nameserver or UaConfig.nameserver in PJSUA/PJSUA2. It does not affect users who rely on the OS resolver (e.g., getaddrinfo()) by not configuring a nameserver, or those using an external resolver via pjsip_resolver_set_ext_resolver(). This issue is fixed in version 2.17. For users unable to upgrade, a workaround is to disable DNS resolution in the PJSIP config (by setting nameserver_count to zero) or to use an external resolver implementation instead.
Analysis
Heap overflow in PJSIP 2.16 and earlier DNS parser allows unauthenticated remote attackers to achieve code execution with no user interaction required. The vulnerability affects only applications explicitly configured with a built-in nameserver; users relying on OS resolvers or external resolver implementations are unaffected. …
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Remediation
Within 24 hours: Inventory all systems running PJSIP versions 2.16 and below and confirm which have DNS resolver functionality enabled. Within 7 days: Implement network segmentation to restrict DNS traffic to trusted internal resolvers only, and disable external DNS resolution in PJSIP configuration if business operations permit. …
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Priority Score
Vendor Status
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| (unstable) | fixed | (unfixed) | - |
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