CVE-2022-0137Public exploit

Application crash via undersized GIF mask buffer

Published Nov 14, 2022 · Updated Apr 25, 2025

Heap buffer overflow in HTMLDOC before 1.9.15 allows attackers to crash the application by processing a crafted GIF image. image_load_gif changes the image dimensions after image_need_mask allocates img->mask, so image_set_mask computes a pointer beyond the allocation and writes through it. Processing an attacker-supplied HTML document and its GIF is required, and the demonstrated consequence is an application crash.

CVSS severity7.5
High
EPSS probability0.59%
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 HTMLDOC before 1.9.15 allows attackers to crash the application by processing a crafted GIF image. image_load_gif changes the image dimensions after image_need_mask allocates img->mask, so image_set_mask computes a pointer beyond the allocation and writes through it. Processing an attacker-supplied HTML document and its GIF is required, and the demonstrated consequence is an application crash.

The record

CVE
CVE-2022-0137
Published
Nov 14, 2022
Updated
Apr 25, 2025
Vendor
HTMLDOC Project
Product
HTMLDOC
Classifications
CWE-787, CWE-119, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 25, 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=1.9.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

HTMLDOC Project · HTMLDOCversion=1.9.14

Published CVSS scores

7.5Fedora ProjectCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1204.002User Execution: Malicious 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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