VulnerabilityPublished 15 Jun 2026Updated 5 Aug 2026

CVE-2026-53703: Red Hat Enterprise Linux 10 · Out-of-bounds Read

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 7.1 High.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score

7.1High

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: Low
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: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to 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 15 Jun 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 29 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-ugly-free	Affected–	Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update Supportgstreamer1-plugins-ugly-free	Affected–	Fixed in–
Red Hat Enterprise Linux 9gstreamer1-plugins-ugly-free	Affected–	Fixed in–
Red Hat Enterprise Linux 9.6 Extended Update Supportgstreamer1-plugins-ugly-free	Affected–	Fixed in–
Red Hat Enterprise Linux 7gstreamer1-plugins-ugly-free	Affected–	Fixed in–
Red Hat Enterprise Linux 8gstreamer1-plugins-ugly-free	Affected–	Fixed in–

AI-suggested

Red Hat has released official security updates for the gstreamer1-plugins-ugly-free package to address this vulnerability. Users should apply the updates provided in Red Hat Enterprise Linux 10 and 10.2 as detailed in Red Hat advisory RHSA-2026:36673. For update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation actions are required beyond applying the official patches.

Description

A vulnerability was found in the GStreamer RealMedia demuxer (gst-plugins-ugly). When processing a RealMedia (.rm) file, the demuxer parses MDPR (media properties) chunks to configure audio streams. For audio stream header versions 4 and 5, the parser reads fields such as codec type, packet size, sample rate, channel count, and extra codec data length from fixed offsets within the chunk without first checking that the chunk contains enough data. If a malicious file provides an MDPR chunk that is too small to contain a complete audio stream header, the parser reads beyond the end of the buffer. This can cause the application to crash. In some cases, bytes read past the buffer boundary may be incorporated into stream metadata, which could result in limited information disclosure.

Impact

Exploitation of this vulnerability can cause denial of service via application crashes and may result in limited information disclosure through incorporation of out-of-bounds bytes into stream metadata. The CVSS v3.1 base score is 7.1 (High), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, low confidentiality impact, no integrity impact, and high availability impact.

Summary

The vulnerability exists in the GStreamer RealMedia demuxer component of the gst-plugins-ugly package used in Red Hat Enterprise Linux 10. When parsing MDPR chunks of RealMedia files, the demuxer reads fixed offsets for audio stream header fields without verifying chunk size, leading to out-of-bounds reads if the chunk is too small. This can cause crashes and potentially disclose limited memory contents. Red Hat has issued security advisories and updates (gstreamer1-plugins-ugly-free-1.26.7-2.el10_2.1) to fix this issue.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Aug 2026, 13:02 UTC

Technical details

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