Service interruption via recursive __proto__ assignment
Published May 3, 2021 · Updated Jul 9, 2026
Prototype pollution in Adaltas mixme before 0.5.1 allows remote attackers to alter inherited object properties through crafted input. The mutate and merge functions recursively assign every enumerable source key into a target object without rejecting proto, which changes Object.prototype. Exploitation requires an application to pass attacker-controlled objects into either function; polluted properties then corrupt application state or interrupt the service.
Summary
What happened
Prototype pollution in Adaltas mixme before 0.5.1 allows remote attackers to alter inherited object properties through crafted input. The mutate and merge functions recursively assign every enumerable source key into a target object without rejecting proto, which changes Object.prototype. Exploitation requires an application to pass attacker-controlled objects into either function; polluted properties then corrupt application state or interrupt the service.
The record
- CVE
- CVE-2021-28860
- Published
- May 3, 2021
- Updated
- Jul 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 3, 2021CVE publishedPublication date reported by the CVE source.
- Jul 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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