CVE-2022-0534Public exploit

Application crash via malformed GIF LZW code size

Published Feb 9, 2022 · Updated Aug 2, 2024

Out-of-bounds read in HTMLDOC 1.9.15 allows context-dependent attackers to crash the application by supplying HTML with a crafted GIF. The gif_read_image function accepts an LZW code size above 12, causing unsigned index arithmetic in gif_get_code to wrap and read beyond its stack buffer. Exploitation requires a user or automated conversion workflow to process the document; the published proof demonstrates a segmentation fault only.

CVSS severity5.5
Medium
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in HTMLDOC 1.9.15 allows context-dependent attackers to crash the application by supplying HTML with a crafted GIF. The gif_read_image function accepts an LZW code size above 12, causing unsigned index arithmetic in gif_get_code to wrap and read beyond its stack buffer. Exploitation requires a user or automated conversion workflow to process the document; the published proof demonstrates a segmentation fault only.

The record

CVE
CVE-2022-0534
Published
Feb 9, 2022
Updated
Aug 2, 2024
Vendor
HTMLDOC Project
Product
HTMLDOC
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=htmldoc 1.9.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

HTMLDOC Project · HTMLDOCversion=htmldoc 1.9.15

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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
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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