CVE-2026-45705

Summary

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.

Affected Software

VendorProductVersion RangeStatus
OpenSIPSopensips>= 3.4.0, < 3.6.6affected
OpenSIPSopensips>= 4.0.0-beta, < 4.0.0-rc1affected

Weaknesses

  • CWE-125: CWE-125: Out-of-bounds Read

References