CVE-2026-125040
NVDCVSS scored by secalert@redhat.com
Vulnerability Summary
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.
CVSS v3.1 Base Metrics — Score 6.5 (MEDIUM)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HAttack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Affected & Patched Versions
Not provided by NVD for this CVE.
No patched version published yet
Until a fix ships, reduce exposure:
- Restrict access to the affected service or interface to trusted networks.
- Disable the affected feature if you do not need it.
- Watch the vendor advisory for a firmware or software update.
What to do
Fix it during your normal patch cycle. No exploitation is confirmed yet.
- Check whether you run the affected product and which version.
- No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
- Subscribe to the vendor advisory so you learn when a fix ships.
Timeline
- Nov 9, 2026Published
- Nov 10, 2026Record last modified
Score, severity and exploitation changes are tracked from the day Watchtower started logging them.
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Set up CVE alertsExternal References
- Vendor Advisoryhttps://access.redhat.com/security/cve/CVE-2026-125040
- Issue Trackinghttps://bugzilla.redhat.com/show_bug.cgi?id=2569124
- Vendor Advisoryhttps://gstreamer.freedesktop.org/security/sa-2026-0023.html
Data last checked: Nov 13, 2026 21:28 UTC