# CVE-2026-40892

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40892
- **Published:** 2026-04-21
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** CWE-121

## Affected products

- `pjsip:pjsip`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40892

## Citation

> AI Analytics. CVE-2026-40892. Retrieved 2026-07-13 from https://api.ai-analytics.org/cve/CVE-2026-40892. Derived from NIST NVD. Licensed CC0.

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