# CVE-2026-90558

## Summary

- **CVE ID:** CVE-2026-90558
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-121
- **Published:** Sep 12, 2026
- **Last Modified:** Sep 14, 2026

## Description

sngrep through 1.8.4 contains stack buffer overflow vulnerabilities in SIP attribute formatting routines when header values exceed the 255-byte buffer limit. Attackers can craft malicious SIP packets with oversized Call-ID, X-Call-ID, or other header fields to overflow stack buffers and cause crashes or execute arbitrary code during packet parsing and rendering.

## Affected Products

- irontec — sngrep (0)

## References

- [CNA](https://github.com/irontec/sngrep/commit/1ff74ee3ab5ff280e8ba976aa8c744dca57eb35b)
- [CNA](https://github.com/irontec/sngrep)
- [CNA](https://github.com/irontec/sngrep/blob/v1.8.4/src/sip_call.c#L260)
- [CNA](https://github.com/irontec/sngrep/blob/v1.8.4/src/sip_msg.c#L150)
- [CNA](https://www.vulncheck.com/advisories/sngrep-through-1.8.4-stack-buffer-overflow-via-sip-headers)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.51%
- **EPSS Percentile:** 42.0

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