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.
Published: 2026-09-12
Score: 9.3 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

Impact

sngrep, a network traffic monitoring tool, contains an unchecked stack buffer in its SIP attribute formatting routines. When SIP header values exceed the 255‑byte limit, the application can overflow the stack while parsing incoming packets. An attacker can craft SIP packets with oversized Call‑ID, X‑Call‑ID, or other header fields, causing the process to crash or potentially execute arbitrary code during rendering.

Affected Systems

The flaw affects irontec sngrep version 1.8.4. Any deployment that receives or processes SIP traffic with this version is susceptible to the overflow.

Risk and Exploitability

The vulnerability carries a CVSS score of 9.3, indicating critical severity. EPSS data indicates a very low exploitation probability (< 1 %), yet the flaw is reachable over the network and does not require local privileges. The issue is not listed in the CISA KEV catalog, but the combination of high severity and network accessibility makes timely remediation essential.

Generated by OpenCVE AI on September 21, 2026 at 13:25 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the vendor‑supplied patch referenced by commit 1ff74ee3ab5ff280e8ba976aa8c744dca57eb35b, which adds bounds checking on SIP header values and mitigates the stack‑based buffer overflow identified as CWE‑121.
  • Upgrade to the latest sngrep release that includes the fixed code, ensuring all buffer‑bound checks are updated.
  • Configure network filtering or firewall rules to block or drop SIP packets whose header fields exceed 255 bytes until a patch is applied, reducing exposure to the CWE‑121 vulnerability.

Generated by OpenCVE AI on September 21, 2026 at 13:25 UTC.

Tracking

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Advisories

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History

Mon, 21 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-120
References
Metrics threat_severity

None

 threat_severity

Critical

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Sat, 12 Sep 2026 18:15:00 +0000

Type Values Removed Values Added
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.
Title sngrep through 1.8.4 Stack Buffer Overflow via SIP Headers
First Time appeared Irontec
Irontec sngrep
Weaknesses CWE-121
CPEs cpe:2.3:a:irontec:sngrep:*:*:*:*:*:*:*:*
Vendors & Products Irontec
Irontec sngrep
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Subscriptions

Irontec Sngrep
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-14T18:24:23.055Z

Reserved: 2026-09-12T11:13:43.326Z

Link: CVE-2026-90558

cve-icon Vulnrichment

Updated: 2026-09-14T18:24:17.751Z

cve-icon NVD

Status : Deferred

Published: 2026-09-12T18:16:44.587

Modified: 2026-09-23T17:17:44.290

Link: CVE-2026-90558

cve-icon Redhat

Severity : Critical

Publid Date: 2026-09-12T18:06:42Z

Links: CVE-2026-90558 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-21T13:30:16Z

Weaknesses
  • CWE-120

    Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

  • CWE-121

    Stack-based Buffer Overflow