CVE-2026-41416

PJSIP: Asymmetric ptime integer overflow in Media Stream

Published Apr 24, 2026 CVSS 4.0 · 8.1 High EPSS < 1% KEV · Not listed

Description

PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, there is an integer overflow in media stream buffer size calculation when processing SDP with asymmetric ptime configuration. The overflow may result in an undersized buffer allocation, which can lead to unexpected application termination or memory corruption This vulnerability is fixed in 2.17.

Analysis

Technical impact

PJSIP contains an integer overflow in the calculation of the media stream buffer size when processing a Session Description Protocol (SDP) that uses asymmetric packet time (ptime) values. The overflow produces an undersized buffer, which can lead to memory corruption or cause the application to terminate unexpectedly. This flaw is represented by CWE-190, Integer Overflow or Wraparound.

Affected Systems

Any installation of the PJProject library, specifically pjsip:pjproject, that uses version 2.16 or earlier is vulnerable. Systems that compile or embed older PJSIP releases would be impacted until the library is upgraded to version 2.17 or newer, which contains the fix.

Risk and Exploitability

The CVSS score of 8.1 classifies the vulnerability as high severity. The EPSS score of less than 1% indicates a low probability that it is being actively exploited in the wild at this time. It is not listed in the CISA KEV catalog. The likely attack surface involves an attacker sending a crafted SIP/SDP message with asymmetric ptime values to a vulnerable application that processes the media stream, potentially leading to memory corruption or denial of service.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

pjsip

pjproject

affected

Version	Status	Constraints
`< 2.17`	affected	—

Configuration 1 [-]

cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*

No data.

Vendor Product Versions

Pjsip

Pjproject

Version	Status	Scheme	Platform
`[0,2.17)`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the pjproject library to version 2.17 or later, which includes the integer overflow fix.
If upgrading is not immediately possible, reconfigure the application to disallow asymmetric ptime values in inbound SDP, ensuring that packet time is symmetrical.
Validate all SDP input for sane ptime values before they reach the buffer size calculation, adding defensive checks to prevent overly large values from causing overflows.
In the meantime, monitor for unusual application crashes or memory corruption events in systems running vulnerable PJSIP versions.

Generated by OpenCVE AI on April 28, 2026 at 05:53 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.279% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://github.com/pjsip/pjproject/commit/66fe416c96e957417621b7be16e9e587d159f9bb
https://github.com/pjsip/pjproject/security/advisories/GHSA-f33g-8hjq-62xr

History

Apr 28, 2026 6:45 PM First appearance in the feed. Affected versions updated. Affected vendors updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
First Time appeared		Teluu Teluu pjsip
CPEs		cpe:2.3:a:teluu:pjsip::::::::
Vendors & Products		Teluu Teluu pjsip
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Apr 27, 2026 8:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Pjsip Pjsip pjproject
Vendors & Products		Pjsip Pjsip pjproject

Apr 27, 2026 2:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Apr 24, 2026 7:00 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, there is an integer overflow in media stream buffer size calculation when processing SDP with asymmetric ptime configuration. The overflow may result in an undersized buffer allocation, which can lead to unexpected application termination or memory corruption This vulnerability is fixed in 2.17.
Title		PJSIP: Asymmetric ptime integer overflow in Media Stream
Weaknesses		CWE-190
References		https://github.com/pjsip/pjproject/commit/66fe416c96e957417621b7be16e9e587d159f9bb https://github.com/pjsip/pjproject/security/advisories/GHSA-f33g-8hjq-62xr
Metrics		cvssV4_0 `{'score': 8.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U'}`