CVE-2026-5056

Code execution via unchecked frame-config length

Published Jul 29, 2026 · Updated Jul 29, 2026

Stack-based buffer overflow in GStreamer qtdemux allows attackers to execute code by processing a crafted UncompressedFrameConfigBox. The box parser copies user-supplied data into a fixed-length stack buffer without first validating that the supplied length fits. Processing attacker-controlled media through qtdemux is required; successful exploitation runs code in the current media process, while failed attempts can crash it.

CVSS severityUnavailable
Unscored
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in GStreamer qtdemux allows attackers to execute code by processing a crafted UncompressedFrameConfigBox. The box parser copies user-supplied data into a fixed-length stack buffer without first validating that the supplied length fits. Processing attacker-controlled media through qtdemux is required; successful exploitation runs code in the current media process, while failed attempts can crash it.

The record

CVE
CVE-2026-5056
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
GStreamer Project
Product
GStreamer
Classifications
T1203
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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=a303670510771b993867ddf62bff3bce0cb988c3

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

GStreamer Project · GStreamerversion=a303670510771b993867ddf62bff3bce0cb988c3

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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