CVE-2026-18298

Code execution via stale output buffer pool

Published Aug 20, 2026 · Updated Aug 21, 2026

Heap buffer overflow in the gdkpixbufdec element in GStreamer gst-plugins-good before 1.28.5 allows attackers to execute code via crafted image sequences. The decoder sizes its output buffer pool from the first frame only and does not reconfigure it when later frames change dimensions or pixel format, so larger subsequent frames overflow undersized heap buffers. Reachability requires an application to process consecutive untrusted images through gdkpixbufdec, such as in a container, stream, or web-delivered sequence; successful exploitation can crash the process, corrupt data, or execute code with the current process privileges.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in the gdkpixbufdec element in GStreamer gst-plugins-good before 1.28.5 allows attackers to execute code via crafted image sequences. The decoder sizes its output buffer pool from the first frame only and does not reconfigure it when later frames change dimensions or pixel format, so larger subsequent frames overflow undersized heap buffers. Reachability requires an application to process consecutive untrusted images through gdkpixbufdec, such as in a container, stream, or web-delivered sequence; successful exploitation can crash the process, corrupt data, or execute code with the current process privileges.

The record

CVE
CVE-2026-18298
Published
Aug 20, 2026
Updated
Aug 21, 2026
Vendor
GStreamer Project
Product
GStreamer
Classifications
CWE-122, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13fcb641ed33d1472e4ffdec2846180b15405053

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

GStreamer Project · GStreamerversion=13fcb641ed33d1472e4ffdec2846180b15405053

Published CVSS scores

7.8ZDI CNACVSS: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

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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-122Heap-based Buffer Overflow
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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