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Full vulnerability report · 2026
CVE-2026-53704High confidence

Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer fileinfo metadata parser

Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support

7.1HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivegst-plugins-ugly1.0Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 11 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-53704 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitygstreamer1-plugins-ugly-free: GStreamer: Out-of-bounds read in RealMedia demuxer FILEINFO metadata parser
46 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • gstreamer1-plugins-ugly-free-0:1.24.11-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-0:1.24.11-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-0:1.24.11-1.el10_0.2.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-0:1.24.11-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-debuginfo-0:1.24.11-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-debuginfo-0:1.24.11-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-debuginfo-0:1.24.11-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-debugsource-0:1.24.11-1.el10_0.2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-debugsource-0:1.24.11-1.el10_0.2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-debugsource-0:1.24.11-1.el10_0.2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • gstreamer1-plugins-ugly-free-0:1.26.7-2.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • gstreamer1-plugins-ugly-free-0:1.26.7-2.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
Summary
A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-36802

No EUVD known-exploited evidence

A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.

What

A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may disrupt the affected service.

What

A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Out-of-bounds Read → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-125
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-36802Official EUVD mapping

A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.

Official EUVD record ↗
BSI · German · WID-SEC-2026-1919GStreamer: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in GStreamer ausnutzen, um einen Denial of Service Angriff durchzuführen, Daten zu manipulieren oder vertrauliche Informationen offenzulegen.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 15 Jun 2026 · Last source change 5 Aug 2026, 08:42 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-36802
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Missing structured fields: affected versions. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link.
    Before
    authoritative remediation link
    After
    authoritative remediation link
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 0:1.26.7-2.el10_2.1 < *; 0:1.24.11-1.el10_0.2 < *; 0:1.22.12-6.el9_8.1 < *; 0:1.22.12-4.el9_6.1 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Enterprise Linux 10.0 Extended Update Support: 0:1.24.11-1.el10_0.2 < *; Red Hat Enterprise Linux 9: 0:1.22.12-6.el9_8.1 < *; Red Hat Enterprise Linux 9.6 Extended Update Support: 0:1.22.12-4.el9_6.1 < *
    CNA ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link · vendor advisory to authoritative remediation link.
    Before
    authoritative remediation link · vendor advisory
    After
    authoritative remediation link
    CNA ↗
  4. Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link · vendor advisory.
    Before
    authoritative remediation link
    After
    authoritative remediation link · vendor advisory
    53f830b8-0a3f-465b-8143-3b8a9948e749 ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 0:1.24.11-1.el10_0.2 < *; 0:1.22.12-6.el9_8.1 < *; 0:1.22.12-4.el9_6.1 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: 0:1.26.7-2.el10_2.1 < *; 0:1.24.11-1.el10_0.2 < *; 0:1.22.12-6.el9_8.1 < *; 0:1.22.12-4.el9_6.1 < *
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-36802↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-53704 · cve.blacktree.nl