OpenSIPS: OOB Read in Multipart Body Boundary Parsing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45705
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-05 00:16:59 UTC
Updated2026-08-05 14:17:06 UTC
DescriptionOpenSIPS 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSIPS Opensips affected >= 3.4.0, < 3.6.6 Not specified
CNA OpenSIPS Opensips affected >= 4.0.0-beta, < 4.0.0-rc1 Not specified

References

ReferenceSourceLinkTags
github.com/OpenSIPS/opensips/commit/4d23613b65579b073784a07a65d3bf52443a... [email protected] github.com
github.com/OpenSIPS/opensips/security/advisories/GHSA-chxf-9368-fqcp 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/OpenSIPS/opensips/commit/5f103effaf5f372cccffe0b138f16998eba1... [email protected] github.com
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