CVE-2026-44291
highpriority · track · 0EPSS 0.005 · 43 %ileDEEURUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (16)
Products and version ranges known to be affected.
- Red Hat Ansible Automation Platform 2.2all versionscert_bundDEcpe:/a:redhat:ansible_automation_platform:2.2
- Red Hat OpenShift Container Platformall versionscert_bundDEcpe:/a:redhat:openshift:container_platform
- protobufjs project protobufjs8.0.0 → 8.0.2nvdUScpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:*:*:*
advisories (2)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2452Red Hat Ansible Automation Platform (node-tar, linkify-it, protobufjs, brace-expansion, fast-uri, DOMPurify): Mehrere SchwachstellenDeutsch2026-07-21csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Ansible Automation Platform ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen, Daten zu manipulieren, einen Denial-of-Service-Zustand auszulösen oder beliebigen Code auszuführen.
- GHSA-75px-5xx7-5xc7protobuf.js: Code generation gadget after prototype pollution2026-05-12ghsa · osvUS
## Summary 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. ## Impact An attacker who can first trigger a prototype pollution vulnerability may be able to influence generated protobufjs encode or decode functions in a way that can lead to arbitrary JavaScript execution. This issue requires a separate prototype pollution primitive before protobufjs is invoked. Applications without a reachable prototype pollution primitive are not directly exploitable through this issue alone. ## Preconditions - The application or one of its dependencies must allow an attacker to pollute `Object.prototype`. - The polluted property must affect protobufjs internal type lookup behavior. - The application must use protobufjs functionality that generates encode or decode code for affected types. - The generated code path must be reached after the prototype pollution has occurred. ## Workarounds Avoid running affected versions in applications where attacker-controlled input can pollute `Object.prototype`. If immediate upgrade is not possible, remove or mitigate reachable prototype pollution primitives and isolate schema/message processing from untrusted application state.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (4)
External citations — patches, advisories, analysis.
- https://github.com/protobufjs/protobuf.js/Patchcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-44291cnnvd
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-75px-5xx7-5xc7enisa_euvd
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-75px-5xx7-5xc7MitigationVendor Advisorynvd
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