What is CVE-2026-90558?

CVE-2026-90558 is a critical-severity vulnerability in Irontec Sngrep, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-09-12.

How severe is CVE-2026-90558?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Irontec Sngrep

CVE-2026-90558

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.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Irontec Sngrep

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

disclosure@vulncheck.com (product)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-90558?: CVE-2026-90558 is a critical-severity vulnerability in Irontec Sngrep, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-09-12.
How severe is CVE-2026-90558?: Critical severity. CVSS v3 base score is 9.8 out of 10.