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NVD / CVE Program· CNA redhat

CVE-2026-53704: Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer fileinfo metadata parser

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: gstreamer1-plugins-ugly-free (AlmaLinux:9) 1.22.12-6.el9_8.1; gst-plugins-ugly1.0 (Debian:14) 1.28.4-1; gstreamer1-plugins-ugly-free (Red Hat:enterprise_linux_eus:10.0) 0:1.24.11-1.el10_0.2.

Low priority for now. Upgrade to gstreamer1-plugins-ugly-free (AlmaLinux:9) 1.22.12-6.el9_8.1; gst-plugins-ugly1.0 (Debian:14) 1.28.4-1; gstreamer1-plugins-ugly-free (Red Hat:enterprise_linux_eus:10.0) 0:1.24.11-1.el10_0.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Jun 15, 2026
Updated
Sep 8, 2026
EPSS
0.2% · 15th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-53704

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:1.26.7-2.el10_2.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:1.24.11-1.el10_0.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 9

    • 0:1.22.12-6.el9_8.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support

    • 0:1.22.12-4.el9_6.1 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9gstreamer1-plugins-ugly-freebefore 1.22.12-6.el9_8.11.22.12-6.el9_8.1
Debian:12gst-plugins-ugly1.0from 0—
Debian:14gst-plugins-ugly1.0before 1.28.4-11.28.4-1
Red Hat:enterprise_linux_eus:10.0gstreamer1-plugins-ugly-freebefore 0:1.24.11-1.el10_0.20:1.24.11-1.el10_0.2
Red Hat:enterprise_linux_eus:10.0gstreamer1-plugins-ugly-free-debuginfobefore 0:1.24.11-1.el10_0.20:1.24.11-1.el10_0.2
Red Hat:enterprise_linux_eus:10.0gstreamer1-plugins-ugly-free-debugsourcebefore 0:1.24.11-1.el10_0.20:1.24.11-1.el10_0.2
Red Hat:enterprise_linux:10.2gstreamer1-plugins-ugly-freebefore 0:1.26.7-2.el10_2.10:1.26.7-2.el10_2.1
Red Hat:enterprise_linux:10.2gstreamer1-plugins-ugly-free-debuginfobefore 0:1.26.7-2.el10_2.10:1.26.7-2.el10_2.1
Red Hat:enterprise_linux:10.2gstreamer1-plugins-ugly-free-debugsourcebefore 0:1.26.7-2.el10_2.10:1.26.7-2.el10_2.1
Red Hat:enterprise_linux:9::appstreamgstreamer1-plugins-ugly-freebefore 0:1.22.12-6.el9_8.10:1.22.12-6.el9_8.1
Red Hat:enterprise_linux:9::appstreamgstreamer1-plugins-ugly-free-debuginfobefore 0:1.22.12-6.el9_8.10:1.22.12-6.el9_8.1
Red Hat:enterprise_linux:9::appstreamgstreamer1-plugins-ugly-free-debugsourcebefore 0:1.22.12-6.el9_8.10:1.22.12-6.el9_8.1
Red Hat:rhel_eus:9.6::appstreamgstreamer1-plugins-ugly-freebefore 0:1.22.12-4.el9_6.10:1.22.12-4.el9_6.1
Red Hat:rhel_eus:9.6::appstreamgstreamer1-plugins-ugly-free-debuginfobefore 0:1.22.12-4.el9_6.10:1.22.12-4.el9_6.1
Red Hat:rhel_eus:9.6::appstreamgstreamer1-plugins-ugly-free-debugsourcebefore 0:1.22.12-4.el9_6.10:1.22.12-4.el9_6.1
Rocky Linux:9gstreamer1-plugins-ugly-freebefore 0:1.22.12-6.el9_8.10:1.22.12-6.el9_8.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

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  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
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Published before and after this one in the same product

  • ← EarlierCVE-2026-52722Jun 15, 2026 · Gstreamer1-plugins-bad-free: gstreamer: signed integer overflow in vmnc decoder cursor payload handling
    28Monitor
  • ← EarlierCVE-2026-53703Jun 15, 2026 · Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer audio stream header parser
    28Monitor
  • Later →CVE-2026-53705Jun 15, 2026 · Gstreamer1-plugins-good: gstreamer: heap buffer overflow in wavpack decoder via integer overflow
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:gstreamer1-plugins-ugly-free1.22.12-6.el9_8.1 · AlmaLinux:9Package registry (OSV)
debian:gst-plugins-ugly1.01.28.4-1 · Debian:14Package registry (OSV)
red hat:gstreamer1-plugins-ugly-free0:1.26.7-2.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:gstreamer1-plugins-ugly-free-debuginfo0:1.26.7-2.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:gstreamer1-plugins-ugly-free-debugsource0:1.26.7-2.el10_2.1 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:gstreamer1-plugins-ugly-free0:1.22.12-6.el9_8.1 · Rocky Linux:9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-49796364 days apartLibxml: type confusion leads to denial of service (dos)
    36Monitor
  • CVE-2026-3400353 days apartXorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access
    31Monitor
  • CVE-2026-8523492 days apartTftp: tftp-hpa: denial of service due to out-of-bounds read/write in remap engine
    30Monitor
  • CVE-2026-115484130 days apartOpen-iscsi: open-iscsi: dhcpv4 option parser heap out-of-bounds read in iscsiuio parse_msg
    30Monitor
  • CVE-2025-11021262 days apartLibsoup: out-of-bounds read in cookie date handling of libsoup http library
    30Monitor
  • CVE-2025-32906427 days apartLibsoup: out of bounds reads in soup_headers_parse_request()
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records