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No exploitation reportedFix available

CVE-2026-44291

No exploitation reported by the sources we read.

  • Published2026-05-13
  • Fixed in8.0.2 · 7.5.6
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. This vulnerability is fixed in 7.5.6 and 8.0.2.

Timeline

dates in UTC
  1. 2026-05-1316:16CVE publishedNVD

Versions per branch

NVD · OSV
Protobufjs project protobufjs
BranchAffectedFixed in
8.0≥ 8.0.0, < 8.0.28.0.2
7.5< 7.5.67.5.6

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • protobufjs protobuf.js
    Affected
    • = < 7.5.6no fix stated
    • = >= 8.0.0, < 8.0.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-05-13

Distribution builds and vendor advisories

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

  • @rootio/protobufjsRoot:npmall versions · fixed in 7.4.0-root.io.2
  • @rootio/protobufjsRoot:npmall versions · fixed in 6.11.2-root.io.1
  • @rootio/protobufjsRoot:npmall versions · fixed in 6.11.4-root.io.1
  • @rootio/protobufjsRoot:npmall versions · fixed in 6.11.4-root.io.2
  • @rootio/protobufjsRoot:npmall versions · fixed in 6.11.4-root.io.3
  • @rootio/protobufjsRoot:npmall versions · fixed in 6.11.4-root.io.4
  • @rootio/protobufjsRoot:npmall versions · fixed in 6.11.4-root.io.5
  • @rootio/protobufjsRoot:npmall versions · fixed in 6.11.6-root.io.1

117 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-44291 Red Hat Product Security31 products fixed · 8 known affected

    protobufjs: protobufjs: Arbitrary Code Execution via prototype pollution

    openshift-pipelines/pipelines-console-plugin-rhel8 as a component of OpenShift Pipelines · openshift-pipelines/pipelines-console-plugin-rhel9 as a component of OpenShift Pipelines · rhceph/alloy-rhel10 as a component of Red Hat Ceph Storage 9 · +5 more

  • RHSA-2026:84734 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • RHSA-2026:60520 Red Hat Product Security24 products fixed

    Red Hat Security Advisory: RHOAI 3.4.4 - Red Hat OpenShift AI

  • RHSA-2026:48151 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat build of Cryostat security update

  • RHSA-2026:42815 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.2 security update

Full record on NVD

Fix

  1. Update Protobufjs project protobufjs to 8.0.2 · 7.5.6
  2. Vendor fix Red Hat Product Security RHSA-2026:84734 · 4 productsFor Red Hat OpenShift AI 3.4.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  3. Vendor fix Red Hat Product Security RHSA-2026:60520 · 24 productsFor Red Hat OpenShift AI 3.4.4 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  4. Vendor fix Red Hat Product Security RHSA-2026:48151 · 2 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  5. Vendor fix Red Hat Product Security RHSA-2026:42815 · 1 productFor more about Ansible plugins for Red Hat Developer Hub, see References links
  6. Workaround from the vendor Red Hat Product Security RHSA-2026:84734 · 321 productsMitigation involves preventing prototype pollution within applications that utilize protobufjs. Administrators should ensure that untrusted input cannot pollute `Object.prototype` in the application or its dependencies. Additionally, isolating schema and message processing from untrusted applicatio…
  7. No fix available, says the vendor Red Hat Product Security CVE-2026-44291 · 1 productFix deferred

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-05-13
  • CNACVSS 3.18.1known since 2026-10-23
  • CNAweakness (CWE)CWE-94known since 2026-10-23
  • FIRST EPSSEPSS score0.5 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-05-12

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-05-13
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-75px-5xx7-5xc7

Frequently asked questions

What is CVE-2026-44291?

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. This vulnerability is fixed in 7.5.6 and 8.0.2.

Is CVE-2026-44291 actively exploited?

Active exploitation of CVE-2026-44291 has not been confirmed. Its EPSS score was 0.5% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-44291?

CVE-2026-44291 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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