Bug 2533104

Summary: CVE-2026-90771 fbthrift: joi: Prototype Pollution via custom messages [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Jon Weiser <jweiser>
Component: fbthriftAssignee: Michel Lind <michel>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: michel
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["99e7e222-ec26-4f35-acab-e0a4f3b4589c"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
Last Closed: 2026-09-29 19:18:22 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2443016, 2532688    

Description Jon Weiser 2026-09-14 14:14:17 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code. Attackers can supply __proto__ keys in custom messages to replace the returned object's prototype, breaking downstream code relying on Object.prototype methods.
Comment 1 Michel Lind 2026-09-29 19:18:22 UTC 
This CVE is in a JavaScript/NodeJS package; the JavaScript here is not shipped in the binary RPMs.