CVE-2022-24839: org.cyberneko.html is an html parser written in Java

This month

HIGH 7.5REMOTEUPGRADEDOWNGRADE

CVE-2022-24839 is a high-severity flaw (CVSS 7.5) affecting nekohtml, weblogic server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

org.cyberneko.html is an html parser written in Java. The fork of `org.cyberneko.html` used by Nokogiri (Rubygem) raises a `java.lang.OutOfMemoryError` exception when parsing ill-formed HTML markup. Users are advised to upgrade to `>= 1.9.22.noko2`. Note: The upstream library `org.cyberneko.html` is no longer maintained. Nokogiri uses its own fork of this library located at https://github.com/sparklemotion/nekohtml and this CVE applies only to th

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-400
Published	2022-04-11
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nekohtml project · oracle

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-11 22:15 UTCPublished CVE record published
2026-06-17 04:32 UTCUpdated Record last modified

nekohtml project nekohtml UPGRADE

Affected: < 1.9.22.noko2

Fixed in: 1.9.22.noko2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nekohtml || rpm -q nekohtml || nekohtml --version

2. UPGRADE to 1.9.22.noko2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nekohtml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nekohtml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

oracle weblogic server DOWNGRADE

Affected: 12.2.1.3.0 · 12.2.1.4.0 · 14.1.1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.2.1.3.0

1. Check installed version

apt-cache policy weblogic-server || rpm -q weblogic-server || weblogic-server --version

2. No fixed release: DOWNGRADE to a release before 12.2.1.3.0 (Debian / Ubuntu)

apt-cache madison weblogic-server sudo apt install weblogic-server=<VERSION_BEFORE_12.2.1.3.0> sudo apt-mark hold weblogic-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list weblogic-server sudo dnf downgrade weblogic-server-<VERSION_BEFORE_12.2.1.3.0> sudo dnf versionlock add weblogic-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-24839?

nekohtml: upgrade to 1.9.22.noko2; weblogic server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-24839 being exploited?

CVE-2022-24839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-24839 affect?

CVE-2022-24839 affects nekohtml, weblogic server. Severity is high (CVSS 7.5). org.cyberneko.html is an html parser written in Java. The fork of `org.cyberneko.html` used by Nokogiri (Rubygem) raises a `java.lang.OutOfMemoryError` exception when parsing ill-formed HTML markup. Users are advised to upgrade to `>= 1.9.2

How urgent is CVE-2022-24839?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities · GitHub vulnerabilities · Oracle WebLogic vulnerabilities

References

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