PT-2026-34170 · Debian+2 · Asterisk+2

Published 2026-04-21 · Updated 2026-05-31 · CVE-2026-40892

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions PJSIP versions 2.16 and earlier

Description A stack buffer overflow occurs in the pjsip auth create digest2() function when using pre-computed digest credentials (PJSIP CRED DATA DIGEST). The function copies credential data using the cred info->data.slen length without performing an upper-bound check, which can overflow the fixed-size ha1 stack buffer of 128 bytes if data.slen exceeds the expected digest string length.

Recommendations Update to a version later than 2.16. As a temporary workaround, restrict the use of the pjsip auth create digest2() function when handling pre-computed digest credentials.

Fix

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-40892

Affected Products

Asterisk

Pjproject

Pjsip

References · 10

• https://github.com/pjsip/pjproject/commit/c82123ea6f3c3652bbc9ebd5e9e658c301451687 · Patch
• https://github.com/pjsip/pjproject/security/advisories/GHSA-2wcg-w3c4-48r7 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-40892 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-40892 · Security Note
• https://ubuntu.com/security/CVE-2026-40892 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40892 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-40892 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-40892 · Vendor Advisory
• https://twitter.com/yottajunaid/status/2060895477240139813 · Twitter Post
• https://twitter.com/CVEnew/status/2048910152833941791 · Twitter Post