What is CVE-2026-45103?

CVE-2026-45103 is a high-severity vulnerability in Opensips, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-08-04.

How severe is CVE-2026-45103?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Opensips

CVE-2026-45103

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the TCP message framing layer parses the Content-Length header using unsigned int arithmetic with no overflow check. When an a…

Vulnerability class: Integer Overflow

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Opensips — versions >= 3.4.0, < 3.6.6, >= 4.0.0-beta, < 4.0.0-rc1

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-45103?: CVE-2026-45103 is a high-severity vulnerability in Opensips, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-08-04.
How severe is CVE-2026-45103?: High severity. CVSS v3 base score is 7.5 out of 10.