Critical Buffer Overflow Vulnerability in sngrep Affects Fedora Users

Linuxsecurity

Critical Buffer Overflow Vulnerability in sngrep Affects Fedora Users

First seen 30 Sep 2026, 04:05 UTC • •72.9

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ThreatCluster •September 30, 2026 at 05:08 UTC

•CVE-2026-90558 is a critical buffer overflow in sngrep affecting Fedora systems.
•CISA has confirmed active exploitation of this vulnerability.
•Users must upgrade to sngrep version 1.8.4-4 to mitigate the risk.

A critical buffer overflow vulnerability, CVE-2026-90558, has been identified in sngrep versions up to 1.8.4, affecting Fedora systems. The flaw allows for potential exploitation through SIP headers, posing a significant risk to users. CISA has confirmed that this vulnerability is being actively exploited in the wild. Fedora users are advised to upgrade to version 1.8.4-4, which includes a fix for this vulnerability. The advisory was published on September 12, 2026, and the patch was made available on September 21, 2026. Users are urged to check their systems and apply the necessary updates to mitigate the risk. Failure to address this vulnerability could lead to unauthorized access and data breaches.

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Timeline

2026-09-12

CVE-2026-90558 published

A critical buffer overflow vulnerability in sngrep was disclosed, affecting versions up to 1.8.4.

2026-09-21

Patch released for sngrep

Fedora released an update to sngrep version 1.8.4-4 to fix CVE-2026-90558, urging users to upgrade.

Recent

Active exploitation confirmed

CISA confirmed that the vulnerability is being actively exploited in the wild, prompting immediate action from users.

More articles in this cluster (3)

Threat Graph

6 entities, 5 inferred relationships (STIX 2.1).

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Technique (1)

Zero-day Exploit

Organization (1)

Fedora

Vulnerability (2)

CVE-2026-90558
Buffer overflow

Weakness (1)

CWE-120 - Classic Buffer Overflow

Affected Platform (1)

Linux

Relationships

CVE-2026-90558 targets Linux
Buffer overflow targets Linux
Zero-day Exploit targets Linux
CVE-2026-90558 related to Fedora
CVE-2026-90558 related to CWE-120 - Classic Buffer Overflow

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