Bug 2458960 (CVE-2026-5958)

Summary: CVE-2026-5958 sed: GNU sed TOCTOU race condition
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, crizzo, dpaolell, jdelft, jmitchel, jupierce, kaycoth, kshier, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, security-response-team, sghai, sidsharm, suppawar, teagle, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A Time-of-Check Time-of-Use (TOCTOU) race condition was found in GNU sed. When the -i (in-place) and --follow-symlinks options are used together, sed resolves the symlink but reopens the path for writing. An attacker with write access to the directory containing the symlink can swap it between the check and the open operations. If a privileged user executes sed in this manner on a path influenced by the attacker, it can lead to arbitrary file overwrites and potential privilege escalation.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Deadline: 2026-04-19   

Description OSIDB Bzimport 2026-04-16 16:21:19 UTC 
A Time-of-Check Time-of-Use (TOCTOU) race condition was found in GNU sed. When the -i (in-place) and --follow-symlinks options are used together, sed resolves the symlink but reopens the path for writing. An attacker with write access to the directory containing the symlink can swap it between the check and the open operations. If a privileged user executes sed in this manner on a path influenced by the attacker, it can lead to arbitrary file overwrites and potential privilege escalation.