# CVE-2026-90778

## Summary

- **CVE ID:** CVE-2026-90778
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-120
- **Published:** Sep 13, 2026
- **Last Modified:** Sep 14, 2026

## Description

SIPp through 3.7.7 contains a buffer overflow vulnerability in get_peer_tag() function when processing SIP To headers with tag parameters of 2049 bytes or more. Unauthenticated remote attackers can send crafted SIP messages with oversized tag parameters to overflow the static buffer and crash the process.

## Affected Products

- SIPp — sipp (0)

## References

- [CNA](https://github.com/SIPp/sipp/pull/879)
- [CNA](https://github.com/SIPp/sipp/commit/ddf22d1a54e0396b2e18ebaf4cf5a3fa860e5da4)
- [CNA](https://github.com/SIPp/sipp/blob/v3.7.7/src/sip_parser.cpp#L76-L113)
- [CNA](https://github.com/SIPp/sipp)
- [CNA](https://www.vulncheck.com/advisories/sipp-through-3.7.7-buffer-overflow-via-sip-to-header-tag)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.63%
- **EPSS Percentile:** 48.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._