CVE-2023-4255

W3m: out-of-bounds write in function checktype() in etc.c (incomplete fix for cve-2022-38223)

MEDIUM
5.5
CVSS Score
Published: December 21, 2023 at 04:08 PM UTC
Updated: June 17, 2026 at 06:37 AM UTC
3 products affected across 2 vendorsFedoraExtra Packages for Enterprise LinuxW3M

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%

Description

An out-of-bounds write issue has been discovered in the backspace handling of the checkType() function in etc.c within the W3M application. This vulnerability is triggered by supplying a specially crafted HTML file to the w3m binary. Exploitation of this flaw could lead to application crashes, resulting in a denial of service condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

5.5MEDIUMredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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