CVE-2026-40892

Name	CVE-2026-40892
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
asterisk (PTS)	bullseye	1:16.28.0~dfsg-0+deb11u4	vulnerable
	bullseye (security)	1:16.28.0~dfsg-0+deb11u9	vulnerable
	sid	1:22.9.0+dfsg+~cs6.16.60671434-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
asterisk	source	(unstable)	(unfixed)
pjproject	source	(unstable)	(unfixed)

Notes

https://github.com/pjsip/pjproject/security/advisories/GHSA-2wcg-w3c4-48r7
https://github.com/pjsip/pjproject/commit/c82123ea6f3c3652bbc9ebd5e9e658c301451687 (2.17)