CVE-2024-31581Network attack vector

Out-of-bounds access via unchecked H.266 tile delta

Published Apr 17, 2024 · Updated Nov 4, 2025

Improper array-index validation in FFmpeg 6.1 allows remote attackers to cause undefined behavior by supplying crafted H.266 data. The H.266 picture-parameter parser validates pps_tile_idx_delta_val against the total tile count rather than bounds relative to tile_idx, permitting out-of-array access. Processing attacker-controlled H.266 parameter-set data is required; public evidence establishes neither code execution nor a specific crash outcome.

CVSS severity9.8
Critical
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in FFmpeg 6.1 allows remote attackers to cause undefined behavior by supplying crafted H.266 data. The H.266 picture-parameter parser validates pps_tile_idx_delta_val against the total tile count rather than bounds relative to tile_idx, permitting out-of-array access. Processing attacker-controlled H.266 parameter-set data is required; public evidence establishes neither code execution nor a specific crash outcome.

The record

CVE
CVE-2024-31581
Published
Apr 17, 2024
Updated
Nov 4, 2025
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-129
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=6.1

Published CVSS scores

9.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index

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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