CVE-2026-57164 PUBLISHED

PJSIP: Heap overflow in the HTTP client

Assigner: GitHub_M
Reserved: 24.06.2026 Published: 04.09.2026 Updated: 04.09.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 8.3

Product Status

Vendor pjsip
Product pjproject
Versions
  • Version < 8d5956afab2ede95ddb199078dc19a8ac0114f3d is affected

References

Problem Types

  • CWE-122: Heap-based Buffer Overflow CWE