CVE-2026-3084

Code execution via unchecked H.266 tile index

Published Mar 13, 2026 · Updated Mar 13, 2026

Out-of-bounds write in GStreamer gst-plugins-bad 1.25.1 through 1.28.0 allows attackers to crash applications or execute code via crafted H.266 media. The gst_h266_parser_parse_picture_partition function adds untrusted tile-index deltas to tile_idx and indexes picture-partition arrays without validating the computed bounds. Processing malicious media in a GStreamer-consuming application is required; successful corruption runs code in that application's process, while failed attempts can crash it.

CVSS severity7.8
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in GStreamer gst-plugins-bad 1.25.1 through 1.28.0 allows attackers to crash applications or execute code via crafted H.266 media. The gst_h266_parser_parse_picture_partition function adds untrusted tile-index deltas to tile_idx and indexes picture-partition arrays without validating the computed bounds. Processing malicious media in a GStreamer-consuming application is required; successful corruption runs code in that application's process, while failed attempts can crash it.

The record

CVE
CVE-2026-3084
Published
Mar 13, 2026
Updated
Mar 13, 2026
Vendor
GStreamer Project
Product
GStreamer
Classifications
CWE-191, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1c6e163aa33962f5ee4a87d29319ccdd5cb67612

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

GStreamer Project · GStreamerversion=1c6e163aa33962f5ee4a87d29319ccdd5cb67612

Published CVSS scores

7.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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