CVE-2022-24836 | Inefficient Regular Expression Complexity in Nokogiri

Nokogiri is an open source XML and HTML library for Ruby. Nokogiri `< v1.13.4` contains an inefficient regular expression that is susceptible to excessive backtracking when attempting to detect encoding in HTML documents. Users are advised to upgrade to Nokogiri `>= 1.13.4`. There are no known workarounds for this issue.

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

CVE-2022-24836 is rated Moderate Risk (59.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.83%). 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-2022-24836

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 2026-05-27 1.45% 1.83% +0.37%
2 2026-05-11 1.34% 1.45% +0.11%
3 2026-04-22 — 1.34% —

Full EPSS history (41 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-24836

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]
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-2022-24836

GitHub Security Advisory for CVE-2022-24836

GHSA-crjr-9rc5-ghw8 · Severity: high · Ecosystem: rubygems — Nokogiri Inefficient Regular Expression Complexity

OS Trackers for CVE-2022-24836

vendor priority summary link
alpine high CVE-2022-24836: 1 source package rows (ruby-nokogiri); 11 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 4. https://security.alpinelinux.org/vuln/CVE-2022-24836
debian not yet assigned CVE-2022-24836 not yet assigned priority: Debian including 1 source packages (ruby-nokogiri), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2022-24836
gentoo low CVE-2022-24836: 1 GLSA(s) (202208-29), 1 atom(s) (dev-ruby/nokogiri); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-24836
redhat high — https://access.redhat.com/security/cve/CVE-2022-24836
suse high — https://www.suse.com/security/cve/CVE-2022-24836/
ubuntu medium CVE-2022-24836 medium priority: Ubuntu including 1 source packages (ruby-nokogiri), 14 status rows across 14 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 6, needed 5, ignored 2, released 1. https://ubuntu.com/security/CVE-2022-24836

Affected software / configurations for CVE-2022-24836

Vendor Product Version Raw CPE
nokogiri nokogiri < 1.13.4 cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
fedoraproject fedora 36 cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
apple macos >= 13.0, < 13.1 cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*

References for CVE-2022-24836

URL Tags
http://seclists.org/fulldisclosure/2022/Dec/23 Mailing List Third Party Advisory
https://github.com/sparklemotion/nokogiri/commit/e444525ef1634b675cd1cf52d39f4320ef0aecfd Patch Third Party Advisory
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-crjr-9rc5-ghw8 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00013.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6DHCOWMA5PQTIQIMDENA7R2Y5BDYAIYM/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OUPLBUZVM4WPFSXBEP2JS3R6LMKRTLFC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XMDCWRQXJQ3TFSETPCEFMQ6RR6ME5UA3/
https://security.gentoo.org/glsa/202208-29 Third Party Advisory
https://support.apple.com/kb/HT213532 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00010.html
cvelogic Threat Intelligence