pjproject PJSUA Account Registration pjsua_acc.c update_service_route stack-based overflow

Summaryinfo

A vulnerability identified as problematic has been detected in pjproject. Impacted is the function update_service_route of the file pjsua_acc.c of the component PJSUA Account Registration. The manipulation leads to stack-based overflow. This vulnerability is uniquely identified as CVE-2026-57161. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in pjproject (affected version not known). This issue affects the function update_service_route of the file pjsua_acc.c of the component PJSUA Account Registration. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-57161 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Applying the patch acc03b57cef7a7d31b8e1f5b9117437d7e87c591 is able to eliminate this problem.

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Type

• Project Management Software

Name

• pjproject

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