CVE-2025-4056Network attack vector

Application crash via process-spawn length overflow

Published Jul 28, 2025 · Updated Jun 30, 2026

Denial of service in GLib before 2.84.1 allows remote attackers to crash Windows applications via oversized process-spawn arguments. The Windows gspawn implementation accumulates argument lengths in a signed integer, allowing a very long command line to wrap the allocation size before copying. Reachability requires a Windows application to pass attacker-influenced data into a g_spawn function and construct a command line approaching 2 GB.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in GLib before 2.84.1 allows remote attackers to crash Windows applications via oversized process-spawn arguments. The Windows gspawn implementation accumulates argument lengths in a signed integer, allowing a very long command line to wrap the allocation size before copying. Reachability requires a Windows application to pass attacker-influenced data into a g_spawn function and construct a command line approaching 2 GB.

The record

CVE
CVE-2025-4056
Published
Jul 28, 2025
Updated
Jun 30, 2026
Vendor
XMLSoft
Product
GLib
Classifications
CWE-94, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record 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=0 <2.84.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

XMLSoft · GLibversion=0 <2.84.1

Published CVSS scores

7.5Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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