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CVE-2026-40892 is a stack-based buffer overflow in PJSIP, a free and open source multimedia communication library written in C, affecting version 2.16 and earlier. The flaw is in pjsip_auth_create_digest2() when the library is configured to use pre-computed digest credentials via PJSIP_CRED_DATA_DIGEST. In the vulnerable code path, credential data is copied using cred_info->data.slen as the copy length without enforcing an upper bound. Because the destination buffer, ha1, is a fixed-size 128-byte stack buffer, an oversized credential length can overflow the stack buffer when data.slen exceeds the expected digest string length.
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