---
cve: "CVE-2026-45705"
severity: "MEDIUM"
cvss: 5.3
epss: "29%"
vendor: "OpenSIPS"
kev: false
exploited: false
published: "2026-08-05 00:16:59"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T07:18:57+02:00"
---

# CVE-2026-45705

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 26c0c4e3364806e77c2915b1c3e03bf9bd90dccd (Commit)
- b3621031661ed10d6af511d7c41f512075357a00 (Commit)

## Referenzen

- <https://github.com/OpenSIPS/opensips/security/advisories/GHSA-chxf-9368-fqcp>
- <https://github.com/OpenSIPS/opensips/commit/4d23613b65579b073784a07a65d3bf52443a4efb>
- <https://github.com/OpenSIPS/opensips/commit/5f103effaf5f372cccffe0b138f16998eba12668>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45705) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_