---
title: "CVE-2026-90778: SIPp - Buffer Overflow"
description: "SIPp <= 3.7.7 contains a buffer overflow caused by processing SIP To headers with tag parameters of 2049 bytes or more in get_peer_tag() function, letting unauthenticated remote attackers crash the process."
url: https://panop.io/threat-heartbeat/CVE-2026-90778/
---

# CVE-2026-90778 SIPp - Buffer Overflow

SIPp <= 3.7.7 contains a buffer overflow caused by processing SIP To headers with tag parameters of 2049 bytes or more in get\_peer\_tag() function, letting unauthenticated remote attackers crash the process.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.86% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90778)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

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

Published

13 September 2026

Updated

15 October 2026

Weakness

[CWE-120](https://cwe.mitre.org/data/definitions/120.html)

## Vendor fix

Update to the latest version of SIPp.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90778](https://nvd.nist.gov/vuln/detail/CVE-2026-90778)
- [https://github.com/SIPp/sipp/commit/ddf22d1a54e0396b2e18ebaf4cf5a3fa860e5da4](https://github.com/SIPp/sipp/commit/ddf22d1a54e0396b2e18ebaf4cf5a3fa860e5da4)
- [https://github.com/SIPp/sipp/pull/879](https://github.com/SIPp/sipp/pull/879)
- [https://www.vulncheck.com/advisories/sipp-through-3.7.7-buffer-overflow-via-sip-to-header-tag](https://www.vulncheck.com/advisories/sipp-through-3.7.7-buffer-overflow-via-sip-to-header-tag)
- [https://github.com/SIPp/sipp](https://github.com/SIPp/sipp)
- [https://github.com/SIPp/sipp/blob/v3.7.7/src/sip\_parser.cpp#L76-L113](https://github.com/SIPp/sipp/blob/v3.7.7/src/sip_parser.cpp#L76-L113)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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