Prototype pollution via inherited config key merge
Published Jul 14, 2026 · Updated Jul 14, 2026
Prototype pollution in Tamagui 2.3.0 and earlier allows remote authenticated users to modify Object.prototype through updateConfig. The function uses an attacker-controlled key for dynamic config lookup, so proto resolves through the prototype chain and Object.assign merges supplied properties into Object.prototype. Reachability requires a consuming application to expose configuration updates to partially trusted input; subsequent effects depend on how that application uses inherited properties.
Summary
What happened
Prototype pollution in Tamagui 2.3.0 and earlier allows remote authenticated users to modify Object.prototype through updateConfig. The function uses an attacker-controlled key for dynamic config lookup, so proto resolves through the prototype chain and Object.assign merges supplied properties into Object.prototype. Reachability requires a consuming application to expose configuration updates to partially trusted input; subsequent effects depend on how that application uses inherited properties.
The record
- CVE
- CVE-2026-15702
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Tamagui LLC
- Product
- Tamagui
- Classifications
- CWE-94, CWE-1321
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.0
- Affected versionversion=2.1
- Affected versionversion=2.2
- Affected versionversion=2.3.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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