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CVE-2026-90558

9.8 · CRITICAL

sngrep through 1.8.4 contains stack buffer overflow vulnerabilities in SIP attribute formatting routines when header values exceed the 255-byte buffer limit.

Published Sep 12, 2026CWE-121EPSS 0.88%

Overview

CVE-2026-90558 is a critical-severity vulnerability. It was published on September 12, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/irontec/sngrepGitHubgithub.com/irontec/sngrep/blob/v1.8.4/src/sip_call.c#L260GitHubgithub.com/irontec/sngrep/blob/v1.8.4/src/sip_msg.c#L150GitHubgithub.com/irontec/sngrep/commit/1ff74ee3ab5ff280e8ba976aa8c744dca57eb35bRefwww.vulncheck.com/advisories/sngrep-through-1.8.4-stack-buffer-overflow-via-sip-headers

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90558?

CVE-2026-90558 is a critical-severity vulnerability. It was published on September 12, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-90558?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-90558?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90558?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90558 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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