CVE-2021-22564Public exploit

Decoder crash via out-of-bounds border copy

Published Nov 1, 2021 · Updated Sep 17, 2024

Heap buffer overflow in libjxl 0.6.0 and earlier allows local users to crash decoding processes via crafted JPEG XL images. LoadBorders() copies the right or bottom border from a nonexistent next group when an undersized edge group is decoded out of order. Triggering requires a slightly oversized image and out-of-order group processing caused by file ordering or heavily loaded multithreaded decoding, producing an out-of-bounds heap read and write.

CVSS severity5.5
Medium
EPSS probability0.31%
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 libjxl 0.6.0 and earlier allows local users to crash decoding processes via crafted JPEG XL images. LoadBorders() copies the right or bottom border from a nonexistent next group when an undersized edge group is decoded out of order. Triggering requires a slightly oversized image and out-of-order group processing caused by file ordering or heavily loaded multithreaded decoding, producing an out-of-bounds heap read and write.

The record

CVE
CVE-2021-22564
Published
Nov 1, 2021
Updated
Sep 17, 2024
Vendor
Go standard library
Product
libjxl
Classifications
CWE-122, CWE-787, T1204.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=unspecified <=0.6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Go standard library · libjxlversion=unspecified <=0.6.0

Published CVSS scores

4.5Google LLCCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1204.002Malicious File

Public exploit references

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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