Vulnerability Description
OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the find_line_delimiter() function in the multipart body parser performs an out-of-bounds read via strncmp() when searching for MIME boundary delimiters. After finding a -- pattern near the end of the body, the function compares delimiter.len bytes (typically 20-70) starting from a position at or past the logical end of the body buffer, reading past the body boundary. The bug triggers when a SIP message has Content-Type: multipart/mixed with a boundary parameter and its body contains -- within two to three bytes of the body's end without being followed by the actual boundary delimiter. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/OpenSIPS/opensips/commit/4d23613b65579b073784a07a65d3bf52443a
- https://github.com/OpenSIPS/opensips/commit/5f103effaf5f372cccffe0b138f16998eba1
- https://github.com/OpenSIPS/opensips/security/advisories/GHSA-chxf-9368-fqcp
- https://github.com/OpenSIPS/opensips/security/advisories/GHSA-chxf-9368-fqcp
FAQ
What is CVE-2026-45705?
CVE-2026-45705 is a vulnerability with a CVSS score of 5.3 (MEDIUM). OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the find_line_delimiter() function in the multipart body parser performs an out-of-boun...
How severe is CVE-2026-45705?
CVE-2026-45705 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45705?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.