Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gst-plugins-base1.0 | 1.28.2-1 | — |
| Debian 13 | gst-plugins-base1.0 | No fix yet | — |
| Debian 12 | gst-plugins-base1.0 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | gst-plugins-base1.0 | No fix yet | — |
| Ubuntu 26.04 LTS | gst-plugins-base1.0 | No fix yet | — |
| Ubuntu 24.04 LTS | gst-plugins-base1.0 | No fix yet | — |
| Ubuntu 22.04 LTS | gst-plugins-base1.0 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | gst-plugins-base1.0 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | gst-plugins-base1.0 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | gst-plugins-base1.0 | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gstreamer1-plugins-base | No fix yet | — |
Advisories 1
- WID-SEC-2026-4421 GStreamer: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026