Bug 2569124 (CVE-2026-125040)

Summary: CVE-2026-125040 gst-plugins-base: gst-plugins-base: Quadratic regex processing in SRT/WebVTT subtitle parser causes denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the SRT and WebVTT subtitle parser in GStreamer's gst-plugins-base. While sanitizing inline subtitle markup, the parser repeatedly searches the remaining text with unanchored regular expressions. A crafted subtitle cue with a long line of unmatched markup-like text can force quadratic CPU use and make a GStreamer-based application unresponsive.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2569213, 2569214    
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Description OSIDB Bzimport 2026-11-09 12:55:52 UTC
GStreamer-SA-2026-0023: The SRT/WebVTT subtitle parser (subparse) uses regular-expression matching and replacement with quadratic time complexity for long lines. A crafted subtitle file can cause excessive CPU use and application unresponsiveness. Fixed in gst-plugins-base 1.28.2.