CVE-2022-40303Network attack vector

Application crash via oversized XML counter overflow

Published Nov 22, 2022 · Updated Apr 29, 2025

Integer overflow in libxml2 before 2.10.3 allows remote attackers to crash XML-processing applications via oversized XML input. With XML_PARSE_HUGE enabled, parser.c lets multiple length counters wrap and then indexes an array at a negative 2 GB offset. The application must enable that parser option and accept a multi-gigabyte document; the documented consequence is a segmentation-fault service interruption.

CVSS severity7.5
High
EPSS probability22.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in libxml2 before 2.10.3 allows remote attackers to crash XML-processing applications via oversized XML input. With XML_PARSE_HUGE enabled, parser.c lets multiple length counters wrap and then indexes an array at a negative 2 GB offset. The application must enable that parser option and accept a multi-gigabyte document; the documented consequence is a segmentation-fault service interruption.

The record

CVE
CVE-2022-40303
Published
Nov 22, 2022
Updated
Apr 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, CAPEC-92, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 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?

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

7.5NISTCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CAPEC-92Forced Integer Overflow
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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