Bug 2542593 (CVE-2026-101909)

Summary: CVE-2026-101909 axios: axios: Denial of Service via prototype pollution gadget in form serialization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in axios. In applications affected by prototype pollution, where an attacker can modify base JavaScript object properties, axios processes inherited options during form data serialization without verifying property ownership. An attacker can leverage this behavior to trigger a Denial of Service (DoS) by causing requests to fail, alter outgoing serialized request data, or potentially execute arbitrary code if function injection is possible.
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Description OSIDB Bzimport 2026-09-28 17:57:47 UTC 
Axios is a promise-based HTTP client for the browser and Node.js. From 0.28.0 until 0.34.0 and 1.15.1 until 1.20.0, ToFormData processes inherited serialization options and visitor properties supplied through prototype pollution. A separate same-process prototype-pollution flaw supplies inherited dots, indexes, metaTokens, maxDepth, visitor, or Blob values before object serialization. The inherited options alter toFormData field naming and data interpretation, maxDepth can force request failure, Blob changes value handling, and a polluted visitor can execute when an attacker already has the stronger ability to inject a function. Serialized field naming and data interpretation can change, maxDepth can cause request failure, Blob can alter value handling, and a polluted visitor can execute under the stronger function-injection primitive. This issue is fixed in versions 0.34.0 and 1.20.0.