# CVE-2026-40892: asterisk: PJSIP is a free and open source multimedia communication library written in C

CVE-2026-40892 is fixed in asterisk on 1 platform by DEBIAN-CVE-2026-40892 (version 1:22.10.0+dfsg+~cs6.17.60671434-1), released April 21, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-40892
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 21, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | asterisk Debian 14 | 1:22.10.0+dfsg+~cs6.17.60671434-1 | [DEBIAN-CVE-2026-40892](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40892.md) | Apr 21, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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