CVE-2022-28366

Certain Neko-related HTML parsers allow a denial of service via crafted Processing Instruction (PI) input that causes excessive heap memory consumption. In particular, this issue exists in HtmlUnit-Neko through 2.26, and is fixed in 2.27. This issue also exists in CyberNeko HTML through 1.9.22 (also affecting OWASP AntiSamy before 1.6.6), but 1.9.22 is the last version of CyberNeko HTML. NOTE: this may be related to CVE-2022-24839.

Published: 2022-04-21 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-28366 is rated Moderate Risk (44/100): CVSS High severity, with low exploitation likelihood (EPSS 0.19%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-28366

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.40% 0.19% -0.21%
2 2025-11-18 0.16% 0.40% +0.24%
3 2025-09-25 — 0.16% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-28366

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2022-28366

GitHub Security Advisory for CVE-2022-28366

GHSA-g9hh-vvx3-v37v · Severity: high · Ecosystem: maven — Denial of service in HtmlUnit-Neko

OS Trackers for CVE-2022-28366

vendor priority summary link
debian not yet assigned CVE-2022-28366 not yet assigned priority: Debian including 1 source packages (libowasp-antisamy-java), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2022-28366
suse medium — https://www.suse.com/security/cve/CVE-2022-28366/
ubuntu medium CVE-2022-28366 medium priority: Ubuntu including 1 source packages (libowasp-antisamy-java), 13 status rows across 13 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, upstream, xenial): needs-triage 7, ignored 6. https://ubuntu.com/security/CVE-2022-28366

Affected software / configurations for CVE-2022-28366

Vendor Product Version Raw CPE
cyberneko_html_project cyberneko_html <= 1.9.22 cpe:2.3:a:cyberneko_html_project:cyberneko_html:*:*:*:*:*:*:*:*
htmlunit htmlunit < 2.27 cpe:2.3:a:htmlunit:htmlunit:*:*:*:*:*:*:*:*
antisamy_project antisamy < 1.6.6 cpe:2.3:a:antisamy_project:antisamy:*:*:*:*:*:*:*:*

References for CVE-2022-28366

cvelogic Threat Intelligence