CVE-2026-40892: PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a stack buffer…
CVE-2026-40892 · Severity: critical · CVSS 9.8 · Published 2026-04-21
PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a stack buffer overflow exists in pjsip_auth_create_digest2() in PJSIP when using pre-computed digest credentials (PJSIP_CRED_DATA_DIGEST). The function copies credential data using cred_info->data.slen as the length without an upper-bound check, which can overflow the fixed-size ha1 stack buffer (128 bytes) if data.slen exceeds the expected digest string length.
No. Junglewise Threat Intelligence has no report of CVE-2026-40892 being exploited in the wild.
How severe is CVE-2026-40892?
Critical severity, with a CVSS score of 9.8, published 21 April 2026.
Which products and versions are affected?
PJSIP. The advisory does not name versions.
Is there a fix for CVE-2026-40892?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-40892?
Check whether you run PJSIP. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.