CVE-2026-40892
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductPjsip
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-121CWE-121
How to fix
Update
- pjsip pjsip2.17 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pjsip pjsip | v < 2.17 | 2.17 |
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