CVE-2026-13051: Software Security Vulnerability Vulnerability
CRITICALCVE-2026-13051 is a CRITICAL (CVSS 9.1) security vulnerability vulnerability (CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-13051 at a Glance
Security Impact
CVSS: 9.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2026-13051
To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-13051, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection'), where the product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
References
Frequently Asked Questions
What is CVE-2026-13051?
Which Software versions are affected?
What version fixes CVE-2026-13051?
What is the CVSS score of CVE-2026-13051?
What CWE is associated with CVE-2026-13051?
How can I check Maven dependencies for CVE-2026-13051?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-fhx5-grqf-hx29",
"modified" : "2026-08-14T18:31:29Z",
"published" : "2026-08-13T18:31:39Z",
"aliases" : [ "CVE-2026-13051" ],
"details" : "Form::Processor::Field::HtmlArea versions from 0.06 through 1.162360 for Perl allow attacker selected method dispatch and resource exhaustion via an HTML::Tidy diagnostic that validate passes to add_error as a Locale::Maketext template.\n\nvalidate runs HTML::Tidy over the submitted markup and passes each resulting message to add_error as its first argument, which add_error hands to the language handle as the Locale::Maketext message key. The default handle's lexicon sets `_AUTO`, so a message that is not a lexicon entry is compiled as a bracket notation template instead of being looked up. Tidy diagnostics quote the offending attribute name or value, so a bracket group in the submitted markup reaches the template position, where the first token of the group names a method called on the language handle and the remaining tokens are its arguments. A group such as `[0]` makes the compile croak, and neither the field nor the handle catches it, so the exception leaves validate. `[sprintf,%2000000000d,7]` reaches CORE::sprintf with an attacker chosen field width.\n\nOne submission of crafted markup to an HtmlArea field throws an unhandled exception out of form validation or allocates an arbitrary amount of memory, and an application whose language handle subclass defines side effecting public methods makes those callable with attacker chosen arguments. The other field types pass fixed templates with the submitted value in an argument slot, where it stays inert, and are unaffected.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-13051"
}, {
"type" : "WEB",
"url" : "https://metacpan.org/release/HANK/Form-Processor-1.162360/source/lib/Form/Processor/Field.pm#L163"
}, {
"type" : "WEB",
"url" : "https://metacpan.org/release/HANK/Form-Processor-1.162360/source/lib/Form/Processor/Field/HtmlArea.pm#L28-31"
}, {
"type" : "WEB",
"url" : "https://security.metacpan.org/patches/F/Form-Processor/1.162360/CVE-2026-13051-r1.patch"
}, {
"type" : "WEB",
"url" : "https://www.cve.org/CVERecord?id=CVE-2012-6329"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-470" ],
"severity" : "CRITICAL",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-08-13T17:17:19Z"
}
}