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Vulnerability record · CVE-2026-57164 · published 4 September 2026

CVE-2026-57164: Teluu pjsip heap-based buffer overflow vulnerability

Teluu · Pjsip

PJSIP is a free and open source multimedia communication library written in C. Prior to commit 8d5956a, a heap buffer overflow exists in the PJLIB-UTIL HTTP client (http_client.c) when buffering an HTTP response body. This affects applications that use the PJLIB-UTIL HTTP client to receive a whole response body at once (a completion callback with no incremental on_data_read callback). When growing the response buffer, an incorrect size calculation based on the server-supplied Content-Length can leave the buffer too small, causing response data to be written past the end of the allocation. A malicious or man-in-the-middle HTTP server can trigger this with a crafted response; impact may range from unexpected application termination to memory corruption. Applications that consume the response incrementally (via on_data_read), or that only connect to trusted servers, are not affected. This issue has been patched via commit 8d5956a.

8.3 CVSS 4.0 High EPSS 0.45% · top 63.3% CWE-122 · Heap-based buffer overflow
8.3CVSS 4.0 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
11 Sep 2026Last modified by NVD

Description

PJSIP is a free and open source multimedia communication library written in C. Prior to commit 8d5956a, a heap buffer overflow exists in the PJLIB-UTIL HTTP client (http_client.c) when buffering an HTTP response body. This affects applications that use the PJLIB-UTIL HTTP client to receive a whole response body at once (a completion callback with no incremental on_data_read callback). When growing the response buffer, an incorrect size calculation based on the server-supplied Content-Length can leave the buffer too small, causing response data to be written past the end of the allocation. A malicious or man-in-the-middle HTTP server can trigger this with a crafted response; impact may range from unexpected application termination to memory corruption. Applications that consume the response incrementally (via on_data_read), or that only connect to trusted servers, are not affected. This issue has been patched via commit 8d5956a.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pjsip/pjproject/commit/8d5956afab2ede95ddb199078dc19a8ac0114f3d Patch
https://github.com/pjsip/pjproject/security/advisories/GHSA-59fr-724j-6fjv PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-38703Teluu pjsip use after free vulnerabilityPJSIP is a free and open source multimedia communication library written in C with high level API in C, C++, Java, C#, and Python languages. SRTP is …EPSS 1.3%9.8CVE-2022-23537Teluu pjsip heap-based buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, S…EPSS 1.0%9.8CVE-2022-31031Teluu pjsip classic buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, S…EPSS 2.0%9.8CVE-2022-24754Teluu pjsip classic buffer overflow vulnerabilityPJSIP is a free and open source multimedia communication library written in C language. In versions prior to and including 2.12 PJSIP there is a stac…EPSS 2.1%9.8CVE-2022-23608Teluu pjsip use after free vulnerabilityPJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, S…EPSS 4.0%9.8CVE-2021-43299Teluu pjsip stack-based buffer overflow vulnerabilityStack overflow in PJSUA API when calling pjsua_player_create. An attacker-controlled 'filename' argument may cause a buffer overflow since it is copi…EPSS 2.5%9.8CVE-2021-43300Teluu pjsip stack-based buffer overflow vulnerabilityStack overflow in PJSUA API when calling pjsua_recorder_create. An attacker-controlled 'filename' argument may cause a buffer overflow since it is co…EPSS 2.4%9.8CVE-2021-43301Teluu pjsip stack-based buffer overflow vulnerabilityStack overflow in PJSUA API when calling pjsua_playlist_create. An attacker-controlled 'file_names' argument may cause a buffer overflow since it is …EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2026-57164), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.