CVE-2022-29546: HtmlUnit NekoHtml Parser before 2.61.0 suffers from a denial of service vulnerability

Q: How do I fix CVE-2022-29546?

htmlunit: upgrade to 2.61.0. Exact commands for each OS are on this page.

Q: Is CVE-2022-29546 being exploited?

CVE-2022-29546 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-29546 affect?

CVE-2022-29546 affects htmlunit. Severity is high (CVSS 7.5). HtmlUnit NekoHtml Parser before 2.61.0 suffers from a denial of service vulnerability. Crafted input associated with the parsing of Processing Instruction (PI) data leads to heap memory consumption. This is similar to CVE-2022-28366 but aff

Q: How urgent is CVE-2022-29546?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2022-29546 is a high-severity flaw (CVSS 7.5) affecting htmlunit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HtmlUnit NekoHtml Parser before 2.61.0 suffers from a denial of service vulnerability. Crafted input associated with the parsing of Processing Instruction (PI) data leads to heap memory consumption. This is similar to CVE-2022-28366 but affects a much later version of the product.

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	1.2% (top 31%)
CISA exploited list	No
Published	2022-04-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: htmlunit

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

Am I affected?

Timeline

2022-04-25 03:15 UTCPublished CVE record published
2026-06-17 04:40 UTCUpdated Record last modified

htmlunit htmlunit UPGRADE

Affected: < 2.61.0

Fixed in: 2.61.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.61.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade htmlunit

Note

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

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-2022-29546?

htmlunit: upgrade to 2.61.0. Exact commands for each OS are on this page.

Is CVE-2022-29546 being exploited?

CVE-2022-29546 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-2022-29546 affect?

CVE-2022-29546 affects htmlunit. Severity is high (CVSS 7.5). HtmlUnit NekoHtml Parser before 2.61.0 suffers from a denial of service vulnerability. Crafted input associated with the parsing of Processing Instruction (PI) data leads to heap memory consumption. This is similar to CVE-2022-28366 but aff

How urgent is CVE-2022-29546?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-26119 CRITICAL 9.8 UPGRADE Versions of the package net.sourceforge.htmlunit:htmlunit from 0 and before 3.0.0 are vulnerable to Remote Cod
CVE-2023-49093 CRITICAL 9.8 UPGRADE HtmlUnit is a GUI-less browser for Java programs
CVE-2023-2798 HIGH 7.5 UPGRADE Those using HtmlUnit to browse untrusted webpages may be vulnerable to Denial of service attacks (DoS)
CVE-2022-28366 HIGH 7.5 UPGRADE UPGRADE Certain Neko-related HTML parsers allow a denial of service via crafted Processing Instruction (PI) input that
CVE-2020-5529 HIGH 8.1 UPGRADE MITIGATE HtmlUnit prior to 2.37.0 contains code execution vulnerabilities

References

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