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CVE-2026-57161

8.2, high

Pjsip pjproject Stack-based Buffer Overflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.2, high high CVSS v3.1
EPSS, next 30 days
0.5% higher than 38.3% of scored CVEs
Exploitation
No public evidence
Published
4 Sept 2026a month ago

Description

PJSIP is a free and open source multimedia communication library written in C. Prior to commit acc03b5, a stack buffer overflow exists in PJSUA when processing Service-Route headers in a registration response (update_service_route() in pjsua_acc.c). This affects applications that register using the PJSUA/PJSUA2 account API (the default registration path). The Service-Route URIs from a 2xx response to REGISTER are stored into a fixed-size array without bounding the number of headers; a registrar that returns an excessive number of Service-Route headers can write past the end of the array on the stack. The values written are internal pointers rather than arbitrary data, so the most likely impact is unexpected application termination (denial of service), though memory corruption cannot be excluded. The malicious response may come from a compromised or malicious registrar, or (over unprotected transports) a spoofed response. This issue has been patched via commit acc03b5.

Details

Vendor
Pjsip
Product
pjproject
Weakness
CWE-121 (opens in a new tab)
Status
Analyzed
Updated
11 Sept 2026
Assigner
security-advisories@github.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

References 2

Patches and fixes 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Pjsip CVEs

Every Pjsip CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-77396 Pjsip pjproject Heap-based Buffer Overflow Vulnerability EPSS 0.2% 7.1, high
  • CVE-2026-57162 Pjsip pjproject Stack-based Buffer Overflow Vulnerability EPSS 0.6% 9.1, critical
  • CVE-2026-57163 Pjsip pjproject Stack-based Buffer Overflow Vulnerability EPSS 0.4% 9.1, critical
  • CVE-2026-57159 PJSIP is a free and open source multimedia communication library written in C EPSS 0.6% 7.5, high

Beyond this page

Is CVE-2026-57161 in your network?

This page tells you how dangerous CVE-2026-57161 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 18 Oct 2026, not the live upstream state.