CVE-2026-24400

File disclosure and SSRF via unsafe XML parsing

Published Jan 26, 2026 · Updated Jan 26, 2026

XXE in AssertJ Core 1.4.0 through 3.27.6 allows attackers to read local files, issue server-side requests, or exhaust resources. XmlStringPrettyFormatter.toXmlDocument(String) creates DocumentBuilderFactory with defaults that permit DTDs and external entities. Exploitation requires an application to pass untrusted XML to isXmlEqualTo(CharSequence) or xmlPrettyFormat(String); consequences are file disclosure, SSRF, or a denial-of-service hang.

CVSS severity8.2
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in AssertJ Core 1.4.0 through 3.27.6 allows attackers to read local files, issue server-side requests, or exhaust resources. XmlStringPrettyFormatter.toXmlDocument(String) creates DocumentBuilderFactory with defaults that permit DTDs and external entities. Exploitation requires an application to pass untrusted XML to isXmlEqualTo(CharSequence) or xmlPrettyFormat(String); consequences are file disclosure, SSRF, or a denial-of-service hang.

The record

CVE
CVE-2026-24400
Published
Jan 26, 2026
Updated
Jan 26, 2026
Vendor
AssertJ
Product
AssertJ Core
Classifications
CWE-611
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 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=>= 1.4.0, < 3.27.7

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

AssertJ · AssertJ Coreversion=>= 1.4.0, < 3.27.7

Published CVSS scores

8.2GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:H/SI:N/SA:N
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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