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CVE-2026-125040— Gst-plugins-base: gst-plugins-base: quadratic regex processing in srt/webvtt subtitle parser causes denial of service

Quick assessment

Affected

Red Hat Red Hat Enterprise Linux 10

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 GStreamer 的 gst-plugins-base 组件中，SRT 和 WebVTT 字幕解析器存在一个漏洞。在清理内联字幕标记时，解析器会使用未锚定的正则表达式反复扫描剩余文本。攻击者可构造包含长行未匹配标记样文本的字幕提示（cue），从而迫使 CPU 使用量呈二次方增长，导致基于 GStreamer 的应用程序无响应。

CVSS 6.5 · Medium Updated Nov 10, 2026

Possible ATT&CK Techniques 2 AI

T1190 · Exploit Public-Facing Application T1562.003

Affected Version Matrix 4

Vendor	Product	Version Range	Status
Red Hat	Red Hat Enterprise Linux 10	`any`	affected
Red Hat	Red Hat Enterprise Linux 7	`any`	affected
Red Hat	Red Hat Enterprise Linux 8	`any`	affected
Red Hat	Red Hat Enterprise Linux 9	`any`	affected

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Vulnerability Information

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Vulnerability Title

Gst-plugins-base: gst-plugins-base: quadratic regex processing in srt/webvtt subtitle parser causes denial of service

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

CWE-1333

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Enterprise Linux 10	-	`cpe:/a:redhat:enterprise_linux:10`
Red Hat	Red Hat Enterprise Linux 7	-	`cpe:/o:redhat:rhel_els:7`
Red Hat	Red Hat Enterprise Linux 8	-	`cpe:/a:redhat:enterprise_linux:8`
Red Hat	Red Hat Enterprise Linux 9	-	`cpe:/a:redhat:enterprise_linux:9`

II. Public POCs for CVE-2026-125040

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-125040

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Other References for CVE-2026-125040 (3)

https://gstreamer.freedesktop.org/security/sa-2026-0023.html
https://access.redhat.com/security/cve/CVE-2026-125040 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2569124 issue-tracking x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-125040

Same Patch Batch · Red Hat · 2026-11-09 · 22 CVEs total

CVE-2026-12977	8.8 HIGH	Org.wildfly.core/wildfly-server: wildfly: rbac bypass in wildfly deployment-operation hand
CVE-2026-19706	8.3 HIGH	Openshift/installer: openshift installer: unconditional csr approval during agent-based in
CVE-2026-119610	8.2 HIGH	Gstreamer1-plugins-good: gstreamer1-plugins-good: out-of-bounds heap read in mtap16/mtap24
CVE-2026-119079	7.5 HIGH	Krb5: mit krb5 kdc unauthenticated cpu dos via quadratic asn.1 sequence of decoding
CVE-2026-121629	7.5 HIGH	Gst-plugins-good: gst-plugins-good: local file disclosure via unvalidated file:// uris in
CVE-2026-112322	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated cpu dos via auth_gssapi client states cleanup
CVE-2026-112323	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated memory exhaustion via failed auth_gssapi_init reque
CVE-2026-112320	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching
CVE-2026-112321	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated memory leak dos via auth_gssapi_init error paths
CVE-2026-112314	7.5 HIGH	Krb5: mit krb5 gss-rpc client memory leak on xid mismatch retries
CVE-2026-84503	6.7 MEDIUM	Ansible-core: ansible-core: ansible.builtin.git invokes git without a `--` separator, allo
CVE-2026-112316	6.5 MEDIUM	Krb5: mit krb5 kadmind authenticated memory leak dos in xdr_krb5_tl_data() decode failure
CVE-2026-112318	6.5 MEDIUM	Krb5: mit krb5 kadmind authenticated dos exploiting dereference of null policy name pointe
CVE-2026-112319	6.5 MEDIUM	Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocatio
CVE-2026-121611	6.5 MEDIUM	Gstreamer1-plugins-bad-free: gst-plugins-bad: use of uninitialized gsth265hrdparams in gst
CVE-2026-121601	6.1 MEDIUM	Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: out-of-bounds read in mxfdemux v
CVE-2026-122056	5.9 MEDIUM	Openscap: one-byte heap buffer overflow in sds-compose may lead to denial-of-service
CVE-2026-125041	5.5 MEDIUM	Gst-plugins-good: gst-plugins-good: qtdemux out-of-bounds heap read from invalid uncompres
CVE-2026-112317	5.3 MEDIUM	Krb5: mit krb5 kdc unauthenticated memory leak dos in kdb keytab key decryption error path
CVE-2026-112315	5.3 MEDIUM	Krb5: mit krb5 kadmind unauthenticated memory leak dos in rpcsec_gss buffer decode failure

Showing top 20 of 22 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10

Same vendor: Red Hat

Same weakness: CWE-1333