---
id: CVE-2026-90558
title: >-
  sngrep through 1.8.4 contains stack buffer overflow vulnerabilities in SIP
  attribute formatting routines when header values exceed the 255-byte buffer
  limit
summary: >-
  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…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
vendor: irontec
product: sngrep
affected:
  - sngrep <= 1.8.4
published: '2026-09-12'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:44.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90558'
references:
  - url: 'https://github.com/irontec/sngrep'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/irontec/sngrep/blob/v1.8.4/src/sip_call.c#L260'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/irontec/sngrep/blob/v1.8.4/src/sip_msg.c#L150'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/irontec/sngrep/commit/1ff74ee3ab5ff280e8ba976aa8c744dca57eb35b
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/sngrep-through-1.8.4-stack-buffer-overflow-via-sip-headers
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90558.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90558'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90558'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00879
epssPercentile: 0.57291
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-14T18:23:35.937384Z'
ingestedAt: '2026-09-14T15:23:07.478Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90558.json)