VulnerabilityPublished 30 Oct 2026

CVE-2026-119727: Red Hat Enterprise Linux 10 · Heap-based Buffer Overflow

Affects Red Hat Enterprise Linux 10Source CVE Database V5

Compare

Not known to be exploited · CVSS 6.5 Medium.

Data as of 30 Oct 2026, 19:19 UTC

CVSS 3.1 base score

6.5Medium

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	6.5

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

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

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: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
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: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 30 Oct 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 30 Oct 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-bad-free	Affected–	Fixed in–
Red Hat Enterprise Linux 7gstreamer1-plugins-bad-free	Affected–	Fixed in–
Red Hat Enterprise Linux 8gstreamer1-plugins-bad-free	Affected–	Fixed in–
Red Hat Enterprise Linux 9gstreamer1-plugins-bad-free	Affected–	Fixed in–

AI-suggested

No mitigation meeting Red Hat's standards for usability and stability is currently available. Users should apply updates when Red Hat releases a fix. SELinux confinement may reduce impact in confined deployments. Avoid opening untrusted H.265 media files until patched.

Description

CVE-2026-119727 is a heap-based buffer overflow vulnerability in the GStreamer gst-plugins-bad H.265 video parser used in Red Hat Enterprise Linux 10. It arises from an integer underflow during parsing of a specially crafted H.265 bitstream with Screen Content Coding (SCC) palette predictor initializer settings, leading to out-of-bounds writes and application crashes. Exploitation requires an attacker to supply a malformed H.265 media file, resulting in denial-of-service without confidentiality or integrity impact. Red Hat Enterprise Linux 9 and 10 are affected, while RHEL 7 and 8 are not. No mitigation is currently available, and a fix exists upstream in GStreamer 1.28.1. Fedora 44 and rawhide include the fix, while Fedora 43 remains vulnerable.

Impact

Successful exploitation causes a denial-of-service condition by crashing the application processing the malformed H.265 media file. There is no demonstrated impact on confidentiality or integrity. The vulnerability requires user interaction to open a crafted file and is limited to applications using the vulnerable GStreamer plugin. The affected code path is uncommon in typical consumer video usage.

Summary

This vulnerability involves an integer underflow in the upper-bound computation of the number of palette predictor entries in the H.265 SCC extension parser within GStreamer's gst-plugins-bad. The underflow allows acceptance of an out-of-range value, causing writes beyond a fixed-size array and resulting in heap-based buffer overflow and application crash. The flaw affects Red Hat Enterprise Linux 9, 10, and Red Hat In-Vehicle OS versions shipping gstreamer1-plugins-bad-free versions prior to the upstream fix 1.28.1. RHEL 7 and 8 are unaffected due to older GStreamer versions lacking this parsing code. Exploitation requires user interaction to open a crafted H.265 file. The impact is limited to denial of service. SELinux confinement may limit impact after a crash. No vendor-supported mitigation is currently available. The vulnerability is rated medium severity with a CVSS 3.1 score of 6.5.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 30 Oct 2026, 19:04 UTC

Technical details

References

Community reviews

Related threats