CVE-2022-31796Public exploitNetwork attack vector

Decoder crash via inconsistent hierarchical MCU sizes

Published May 29, 2022 · Updated Aug 3, 2024

Heap-based buffer over-read in libjpeg 1.63 allows remote attackers to crash an image-decoding process via a crafted JPEG image. HierarchicalBitmapRequester::FetchRegion copies image data using MCU dimensions that can differ from those used to allocate the source line buffer. A user or consuming application must decode an image containing inconsistent component subsampling across hierarchical levels.

CVSS severity6.5
Medium
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer over-read in libjpeg 1.63 allows remote attackers to crash an image-decoding process via a crafted JPEG image. HierarchicalBitmapRequester::FetchRegion copies image data using MCU dimensions that can differ from those used to allocate the source line buffer. A user or consuming application must decode an image containing inconsistent component subsampling across hierarchical levels.

The record

CVE
CVE-2022-31796
Published
May 29, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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