Bug 2531097

Summary: CVE-2026-57164 asterisk: heap overflow in the HTTP client [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: asteriskAssignee: EPEL Packagers SIG <epel-packagers-sig>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: epel10CC: bennie.joubert, epel-packagers-sig, jsmith.fedora, lemenkov
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["cafef0c3-a3f1-4f64-9940-2de73f478943"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
Last Closed: 2026-09-11 19:57:51 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2528763    

Description Guilherme de Almeida Suckevicz 2026-09-09 17:28:18 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Peter Lemenkov 2026-09-11 19:49:57 UTC 
Not applicable to Asterisk.

This is a heap buffer overflow in the PJLIB-UTIL HTTP client, http_client.c, when buffering a whole HTTP response body. The upstream advisory states it affects applications that use that client to receive a complete response body at once, via a completion callback with no incremental on_data_read callback.

Asterisk does not use PJLIB-UTIL's HTTP client. There are no references to it anywhere in the Asterisk source tree; Asterisk has its own HTTP implementation.

Fixed upstream in pjproject commit 8d5956a. Same determination as the Fedora tracker, bug 2531096.
Comment 2 Peter Lemenkov 2026-09-11 19:57:51 UTC 
Closing as NOTABUG per the analysis above — the flaw is in PJLIB-UTIL's HTTP client, which Asterisk does not use.

As with the other pjproject CVEs in this batch, this is a reachability determination rather than the code being absent: http_client.c is still compiled into the bundled library.