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CVE Record

CVE-2026-3084: GStreamer H.266 Codec Parser Integer Underflow Remote Code Execution Vulnerability

GStreamer H.266 Codec Parser Integer Underflow 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 parsing of picture partitions. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28910.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-3084 is a high-severity memory corruption flaw in GStreamer's H.266 parser. A malicious media input could cause code execution inside the application using GStreamer. User or application interaction with media parsing is required; the source bundle does not show confirmed active exploitation.

Executive priority

Prioritize remediation for systems that ingest user-provided media or process media automatically. Treat this as high business risk where GStreamer runs in trusted application contexts, but avoid emergency claims unless vendor or KEV evidence changes.

Technical view

The flaw is an integer underflow in H.266 picture partition parsing caused by insufficient validation of user-supplied data before a memory write. ZDI describes arbitrary code execution in the current process context. CVSS 3.0 is 7.8 with UI required and no privileges required.

Likely exposure

Exposure is most likely where GStreamer parses untrusted or externally supplied H.266/VVC media, including desktop media players, transcoders, thumbnailers, upload pipelines, or embedded applications. The provided affected data is limited and does not define all impacted release versions.

Exploitation context

The source bundle describes remote attacker code execution, but the CVSS vector requires local interaction and user interaction. Attack vectors depend on how an application uses GStreamer. KEV is false, and no cited source in the bundle confirms exploitation in the wild.

Researcher notes

Evidence is strongest for the parser class, flaw type, and fix reference. Version impact is incomplete in the provided bundle, listing a commit-like version identifier and unknown default status. Validate exposure through actual package provenance and downstream advisories.

Mitigation direction

  • Apply the vendor GStreamer fix commit or downstream patched packages when available.
  • Check Red Hat and vendor advisories for product-specific affected and fixed package status.
  • Restrict processing of untrusted H.266/VVC media until affected systems are patched.
  • Reduce privileges for media-processing services that invoke GStreamer.
  • Monitor vendor guidance for additional mitigations or corrected version ranges.

Validation and detection

  • Inventory systems and applications that include or dynamically load GStreamer.
  • Identify workflows that parse externally supplied H.266/VVC media.
  • Verify builds include GStreamer commit 496e4f296e658fba7fd40027d3bbe6095633ec91 or downstream equivalent.
  • Check Red Hat CVE and Bugzilla entries for package status in your distributions.
  • Confirm media-processing services run with least required privileges.
Prepared
Confidence
medium
Sources
7

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-191: 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-2026-3084 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
6Source 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-2026-3084Attack 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: GStreamer: Remote Code Execution via integer underflow in H.266 Codec Parser
other:Red Hat severity ratingcvssV3_1
  • 2026-03-13T21:01:25.452Z: Reported to Red Hat.
  • 2026-03-13T20:42:03.443Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GStreamerGStreamer1c6e163aa33962f5ee4a87d29319ccdd5cb67612unknown
Weakness

CWE details

CWE-191

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

CWE-191 · source CWE mapping

Integer Underflow (Wrap or Wraparound)

Integer Underflow (Wrap or Wraparound) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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