Is CVE-2026-57436 in the CISA KEV catalog?

No. CVE-2026-57436 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-57436?

CVE-2026-57436 has a CVSS v3 base score of 5.3 (Moderate).

What is the EPSS score for CVE-2026-57436?

CVE-2026-57436 has an EPSS score of 0.31% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-57436?

Upgrade ruby-nokogiri on debian unstable to 1.19.4+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-57436

MEDIUM

5.3

CVSS v3

NVD

Description

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.

CWE-416Use After Free

How to fix

Remediation Available

ruby-nokogiriDebian

Fixed in:1.19.4+dfsg-1CVE-2026-57436

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

Embed a live status badge for CVE-2026-57436

Markdown

[![CVE-2026-57436](https://tridentstack.com/cve/badge/CVE-2026-57436.svg)](https://tridentstack.com/cve/CVE-2026-57436)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-57436"><img src="https://tridentstack.com/cve/badge/CVE-2026-57436.svg" alt="CVE-2026-57436"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-26.