MEDIUM

CVE-2026-59877

CVSS v3

5.3

MEDIUM

EPSS Score

0.7 %

exploit probability, as of 2026-10-17

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

protobufjsnpmfrom 8.0.0 · fixed in 8.6.6

Vendor advisories

CVE-2026-59877 Red Hat Product Security45 products fixed · 11 known affected
protobufjs: protobufjs: Denial of Service via crafted .proto schema
openshift-pipelines/pipelines-console-plugin-pf5-rhel9 as a component of OpenShift Pipelines · openshift-pipelines/pipelines-console-plugin-rhel8 as a component of OpenShift Pipelines · openshift-pipelines/pipelines-console-plugin-rhel9 as a component of OpenShift Pipelines
RHSA-2026:71179 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update
RHSA-2026:68333 Red Hat Product Security2 products fixed
Red Hat Security Advisory: Red Hat build of Cryostat security update
RHSA-2026:67279 Red Hat Product Security2 products fixed
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update
RHSA-2026:62260 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.30.0 Release.
RHSA-2026:60477 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.21.31 bug fix and security update

10 more advisories

Full record on NVD

Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.

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: 2026-07-08
Last Modified: 2026-07-08
GitHub Advisory: GHSA-j3f2-48v5-ccww

Frequently asked questions

What is CVE-2026-59877?

Is CVE-2026-59877 actively exploited?

Active exploitation of CVE-2026-59877 has not been confirmed. Its EPSS score was 0.7% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-59877?

CVE-2026-59877 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.

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