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CVE Record

CVE-2026-2923: GStreamer DVB Subtitles Out-Of-Bounds Write Remote Code Execution Vulnerability

GStreamer DVB Subtitles Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the handling of coordinates. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28838.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-2923 is a GStreamer DVB subtitle parsing flaw that can write outside an allocated memory buffer. A malicious media or subtitle input could let code run inside the application using GStreamer. Business risk is highest where servers or desktop workflows process untrusted media.

Executive priority

Treat as high priority for environments processing untrusted media. Patch managed Linux fleets and media-processing workloads first, then confirm embedded or bundled GStreamer dependencies are not missed.

Technical view

The flaw is a CWE-787 out-of-bounds write in GStreamer coordinate handling for DVB subtitles. ZDI describes arbitrary code execution in the current process, requiring interaction with the library. The CVSS vector is 7.8 high, with user interaction required and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure depends on whether applications use vulnerable GStreamer builds and process DVB subtitle data. The bundle does not provide clear affected release ranges, only a specific version identifier and upstream commit reference. Red Hat advisories indicate packaged ecosystem impact for some Red Hat products.

Exploitation context

The supplied sources do not establish active exploitation, and the CVE is not marked KEV. Attack vectors may vary by implementation, but exploitation requires a crafted input to reach GStreamer DVB subtitle handling through an application or service.

Researcher notes

The bundle supports RCE impact through an out-of-bounds write but does not include exploit evidence or complete release-level affected-version mapping. Validate exposure through actual package metadata, build manifests, and vendor advisories rather than relying only on the commit hash shown.

Mitigation direction

  • Apply GStreamer or distribution updates referenced by upstream and Red Hat advisories.
  • Review Red Hat errata for impacted platforms and package-specific fixed versions.
  • Update bundled GStreamer copies in products, containers, appliances, and desktop images.
  • Limit processing of untrusted media or DVB subtitle content until patched.
  • Check vendor guidance if no package update is available for your platform.

Validation and detection

  • Inventory systems and applications that include or dynamically load GStreamer.
  • Identify media ingestion, playback, transcoding, or broadcast workflows using DVB subtitles.
  • Compare installed GStreamer packages against applicable vendor advisories and fixed builds.
  • Confirm third-party products are rebuilt against patched GStreamer components.
  • Review crash telemetry for suspicious failures in subtitle or media parsing paths.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-787: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-2923 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
13Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.0HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9zdi
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2026-2923Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPgstreamer-plugins-bad: GStreamer: Remote Code Execution via out-of-bounds write in DVB Subtitles handling
other:Red Hat severity ratingcvssV3_1
  • 2026-03-13T21:02:25.746Z: Reported to Red Hat.
  • 2026-03-13T20:39:01.199Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GStreamerGStreamer1c6e163aa33962f5ee4a87d29319ccdd5cb67612unknown
Weakness

CWE details

CWE-787

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-787 · source CWE mapping

Out-of-bounds Write

Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs