MEDIUM

CVE-2026-79772

CVSS v3

5.3

MEDIUM

EPSS Score

0.3 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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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

nokogiriRubyGemsfrom 1.5.1 · fixed in 1.19.1

Vendor advisories

CVE-2026-79772 Red Hat Product Security7 known affected
nokogiri: Nokogiri: Signature validation bypass via unchecked return value
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 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.

Technical details

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

Frequently asked questions

What is CVE-2026-79772?

Is CVE-2026-79772 actively exploited?

Active exploitation of CVE-2026-79772 has not been confirmed. Its EPSS score was 0.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-79772?

CVE-2026-79772 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:L/A:N.

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