# CVE-2026-57164

## Summary

- **CVE ID:** CVE-2026-57164
- **Severity:** HIGH
- **CVSS Score:** 8.3 (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)
- **CWE:** CWE-122
- **Published:** Sep 4, 2026
- **Last Modified:** Sep 8, 2026

## 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.

## Affected Products

- pjsip — pjproject (< 8d5956afab2ede95ddb199078dc19a8ac0114f3d)

## References

- [CNA](https://github.com/pjsip/pjproject/security/advisories/GHSA-59fr-724j-6fjv)
- [CNA](https://github.com/pjsip/pjproject/commit/8d5956afab2ede95ddb199078dc19a8ac0114f3d)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._