---
title: "CVE-2026-90558: sngrep - Buffer Overflow"
description: "sngrep <= 1.8.4 contains a stack buffer overflow caused by improper handling of oversized SIP header values in attribute formatting routines, letting attackers execute arbitrary code or cause crashes during packet parsing."
url: https://panop.io/threat-heartbeat/CVE-2026-90558/
---

# CVE-2026-90558 sngrep - Buffer Overflow

sngrep <= 1.8.4 contains a stack buffer overflow caused by improper handling of oversized SIP header values in attribute formatting routines, letting attackers execute arbitrary code or cause crashes during packet parsing.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.88% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90558)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

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

Published

12 September 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest version beyond 1.8.4.

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-2026-90558](https://nvd.nist.gov/vuln/detail/CVE-2026-90558)
- [https://github.com/irontec/sngrep](https://github.com/irontec/sngrep)
- [https://github.com/irontec/sngrep/blob/v1.8.4/src/sip\_call.c#L260](https://github.com/irontec/sngrep/blob/v1.8.4/src/sip_call.c#L260)
- [https://github.com/irontec/sngrep/blob/v1.8.4/src/sip\_msg.c#L150](https://github.com/irontec/sngrep/blob/v1.8.4/src/sip_msg.c#L150)
- [https://github.com/irontec/sngrep/commit/1ff74ee3ab5ff280e8ba976aa8c744dca57eb35b](https://github.com/irontec/sngrep/commit/1ff74ee3ab5ff280e8ba976aa8c744dca57eb35b)
- [https://www.vulncheck.com/advisories/sngrep-through-1.8.4-stack-buffer-overflow-via-sip-headers](https://www.vulncheck.com/advisories/sngrep-through-1.8.4-stack-buffer-overflow-via-sip-headers)

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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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