# CVE-2026-45537 — opensips

> As of 2026-08-05, CVE-2026-45537 is a CRITICAL-severity vulnerability in opensips, CVSS v3.1 9.1, EPSS 0.3% (28.4th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-45537 as of 2026-08-05; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-05

## What is CVE-2026-45537?

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the construct_uri() function concatenates multiple URI components (protocol, username, domain, port, params) into a fixed 1024-byte global BSS buffer without any bounds checking. When a routing script calls construct_uri() with an attacker-controlled username, a combined component length exceeding 1024 bytes overflows the buffer, corrupting adjacent global data with attacker-controlled content. The overflow reaches disable_503_translation, a global flag controlling SIP 503 response handling, allowing an attacker to deterministically set the flag via the URI username and alter the server's routing behavior for subsequent messages. Because the same buffer is shared with contact_builder(), the overflow also corrupts that function's data, and without a memory sanitizer the adjacent globals are silently overwritten on every request containing a long username. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.

The record classifies CVE-2026-45537 under weakness class [CWE-120](https://intel.threadlinqs.com/cwe/CWE-120). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 62 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 28.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-04, last modified 2026-08-05

## Is CVE-2026-45537 being exploited?

It currently carries a trending score of 37 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **OpenSIPS**: opensips

## How to fix CVE-2026-45537

No vendor patch reference has been recorded for CVE-2026-45537 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-45537

No threat campaign in the Threadlinqs corpus currently references CVE-2026-45537, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-06. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/OpenSIPS/opensips/security/advisories/GHSA-v7h4-fwrc-c66v)

**Other references**

- [github.com](https://github.com/OpenSIPS/opensips/commit/4d23613b65579b073784a07a65d3bf52443a4efb)
- [github.com (5f103effaf5f372cccffe0b138f16998eba12668)](https://github.com/OpenSIPS/opensips/commit/5f103effaf5f372cccffe0b138f16998eba12668)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-45537
Full detection coverage and IOCs for threats exploiting CVE-2026-45537 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp