MEDIUM

CVE-2026-79771

CVSS v3

5.3

MEDIUM

EPSS Score

0.4 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for nokogiri.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

nokogiriRubyGemsall versions · fixed in 1.19.3

Vendor advisories

CVE-2026-79771 Red Hat Product Security9 known affected
nokogiri: Nokogiri: Denial of Service via XSLT transform memory leak
3scale-amp2/backend-rhel8 as a component of Red Hat 3scale API Management Platform 2 · 3scale-amp2/system-rhel8 as a component of Red Hat 3scale API Management Platform 2 · 3scale-amp2/system-rhel9 as a component of Red Hat 3scale API Management Platform 2

Full record on NVD

Description

Nokogiri versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. Attackers can exploit this by passing attacker-controlled input with null bytes to transform parameters, causing heap allocations to leak and enabling denial of service against long-running processes.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: 2026-08-25
Last Modified: 2026-08-25

Frequently asked questions

What is CVE-2026-79771?

Is CVE-2026-79771 actively exploited?

Active exploitation of CVE-2026-79771 has not been confirmed. Its EPSS score was 0.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-79771?

CVE-2026-79771 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Running nokogiri? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? CVE Watch alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database