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MEDIUM

CVE-2026-71497

CVSS v3

4.7

MEDIUM

EPSS Score

0.3 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • org.jsoup:jsoupMavenfrom 1.14.3 · fixed in 1.23.1

Vendor advisories

  • CVE-2026-71497 Red Hat Product Security96 known affected

    org.jsoup/jsoup: jsoup: Cross-site scripting via malformed HTML tag names

    jsoup as a component of Cryostat 4 · mta/mta-cli-rhel9 as a component of Migration Toolkit for Applications 8 · mta/mta-java-external-provider-rhel9 as a component of Migration Toolkit for Applications 8

  • RHSA-2026:69440 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Quarkus 3.33.3.SP2 release and security update

  • RHSA-2026:69470 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Quarkus 3.27.5.SP2 release and security update

Full record on NVD

Description

jsoup is a Java library for working with real-world HTML. From 1.14.3 until 1.23.1, jsoup's HTML parser could incorrectly handle a malformed tag name ending in a control character, causing the tag to acquire the parsing behavior of a different element. When a custom Safelist permits certain raw-text elements, this misparsing can cause content that should remain inert text to be emitted as active markup after serialization, potentially resulting in cross-site scripting. jsoup's built-in Safelists are not affected. This issue is fixed in version 1.23.1.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2026-08-06
Last Modified
2026-08-07

Frequently asked questions

What is CVE-2026-71497?

jsoup is a Java library for working with real-world HTML. From 1.14.3 until 1.23.1, jsoup's HTML parser could incorrectly handle a malformed tag name ending in a control character, causing the tag to acquire the parsing behavior of a different element. When a custom Safelist permits certain raw-text elements, this misparsing can cause content that should remain inert text to be emitted as active markup after serialization, potentially resulting in cross-site scripting. jsoup's built-in Safelists are not affected. This issue is fixed in version 1.23.1.

Is CVE-2026-71497 actively exploited?

Active exploitation of CVE-2026-71497 has not been confirmed. Its EPSS score was 0.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-71497?

CVE-2026-71497 has a CVSS v3 base score of 4.7 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.

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