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.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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. (CVE-2026-40892)

  - PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a
    buffer overflow vulnerability exists in PJNATH ICE Session when processing credentials with excessively
    long usernames. (CVE-2026-25994)

  - PJSIP is a free and open source multimedia communication library. Versions prior to 2.17 have a critical
    heap buffer underflow vulnerability in PJSIP's H.264 packetizer. The bug occurs when processing malformed
    H.264 bitstreams without NAL unit start codes, where the packetizer performs unchecked pointer arithmetic
    that can read from memory located before the allocated buffer. Version 2.17 contains a patch for the
    issue. (CVE-2026-26203)

  - PJSIP is a free and open source multimedia communication library written in C. In versions 2.16 and below,
    there is a critical Heap-based Buffer Overflow vulnerability in PJSIP's H.264 unpacketizer. The bug occurs
    when processing malformed SRTP packets, where the unpacketizer reads a 2-byte NAL unit size field without
    validating that both bytes are within the payload buffer bounds. The vulnerability affects applications
    that receive video using H.264. A patch is available at
    https://github.com/pjsip/pjproject/commit/f821c214e52b11bae11e4cd3c7f0864538fb5491. (CVE-2026-26967)

  - PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a
    heap use-after-free vulnerability exists in PJSIP's event subscription framework (evsub.c) that is
    triggered during presence unsubscription (SUBSCRIBE with Expires=0). This issue has been patched in
    version 2.17. (CVE-2026-28799)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-40892)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
444415	Alpine: multiple pjproject packages: security update to 2.17-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
444415	Alpine: multiple pjproject packages: security update to 2.17-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
309690	Linux Distros Unpatched Vulnerability : CVE-2026-40892	Nessus	Misc.	critical

Detections

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CVE-2026-40892

critical

Tenable Plugins

critical

critical

critical