Bug 2511492

Summary: CVE-2026-59879 seamonkey: Immutable.js: Denial of Service due to mishandling of large index values in List operations [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Vipul Nair <vinair>
Component: seamonkeyAssignee: Jan Horak <jhorak>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: dmitry, gecko-bugs-nobody, jhorak
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["91ec21a5-1ddf-475b-b59d-a6713c7862e5"]}
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Clone Of: Environment:
Last Closed: 2026-08-05 14:37:17 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2498158    

Description Vipul Nair 2026-08-05 12:48:42 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.

Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, List#set, List#setSize, List#setIn, List#updateIn, and the functional set, setIn, and updateIn mishandle an index or size in the range 2 ** 30 to 2 ** 31 in setListBounds in src/List.js, causing an empty List to enter an uncatchable infinite loop, a populated List to allocate without bound until process abort, or setSize to silently wrap large values. This issue is fixed in versions 4.3.9 and 5.1.8.
Comment 1 Dmitry Butskoy 2026-08-05 14:37:17 UTC 
SeaMonkey does not use immutable.js npm.