---
title: "CVE-2026-45705\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-45705?format=md
keywords: index, follow
---

# CVE-2026-45705

Publication date 5 August 2026

Last updated 7 August 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2026-45705?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| opensips | 26.04 LTS resolute | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| 18.04 LTS bionic | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.3 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | Low |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-45705)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-45705)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-45705)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-45705)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-45705>
* <https://github.com/OpenSIPS/opensips/commit/4d23613b65579b073784a07a65d3bf52443a4efb>
* <https://github.com/OpenSIPS/opensips/commit/5f103effaf5f372cccffe0b138f16998eba12668>
* <https://github.com/OpenSIPS/opensips/security/advisories/GHSA-chxf-9368-fqcp>