VulnerabilityPublished 9 Nov 2026

CVE-2026-121629: Red Hat Enterprise Linux 10 · External Control of File Name or Path

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 7.5 High.

Data as of 9 Nov 2026, 11:49 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (redhat)	CVSS 3.1	7.5

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red Hat Enterprise Linux 10gstreamer1-plugins-good	Affected–	Fixed in–
Red Hat Enterprise Linux 6gstreamer-plugins-good	Affected–	Fixed in–
Red Hat Enterprise Linux 7gstreamer1-plugins-good	Affected–	Fixed in–
Red Hat Enterprise Linux 7gstreamer-plugins-good	Affected–	Fixed in–
Red Hat Enterprise Linux 8gstreamer1-plugins-good	Affected–	Fixed in–
Red Hat Enterprise Linux 9gstreamer1-plugins-good	Affected–	Fixed in–

AI-suggested

Avoid opening HLS, DASH, or MSS manifests from untrusted network sources. Run GStreamer-based applications with minimal filesystem access using Linux namespaces or containers to restrict access to only necessary directories. Use network controls to limit which manifest hosts the application may contact. These mitigations reduce risk but do not fully remove the vulnerability. The vendor advisory does not explicitly state that a patch is available for RHEL 10 or Fedora; the upstream fix is in gstreamer1-plugins-good 1.28.9. Check the vendor advisory for updates on official fixes.

Description

CVE-2026-121629 is a vulnerability in GStreamer's adaptive streaming demuxers (HLS, DASH, MSS) used in Red Hat Enterprise Linux 10. It allows an attacker who controls or can inject content into a media manifest to include file:// URIs that cause the application to read arbitrary local files. This can lead to disclosure of sensitive local files in automated or server-side deployments. The vulnerability affects RHEL 10.2 and later streams shipping gstreamer1-plugins-good 1.26.x or newer, Fedora 43, and Fedora 44 and Rawhide versions prior to 1.28.9. RHEL 9 and earlier are not affected. Mitigations include avoiding untrusted manifest sources and restricting filesystem access via containers or namespaces.

Impact

An attacker who can control or inject content into adaptive streaming manifests can cause GStreamer-based applications to read arbitrary local files via file:// URIs. This leads to disclosure of sensitive local files, violating confidentiality. The vulnerability does not impact integrity or availability. It is particularly impactful in automated or server-side deployments where pipeline output is stored or forwarded. Existence of files can also be inferred through error responses even if content is not directly observable.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Nov 2026, 11:49 UTC

Technical details

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