Bug 2509568

Summary: CVE-2026-0708 libucl: libucl: Denial of Service via embedded null byte in UCL input [fedora-42]
Product: [Fedora] Fedora Reporter: Patrick Del Bello <pdelbell>
Component: libuclAssignee: Timothée Floure <timothee.floure>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: 42CC: timothee.floure
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["a227f760-41e3-4abc-b194-84b98394649b"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2427770    

Description Patrick Del Bello 2026-07-30 19:05:43 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.

A SEGV fault occurs in ucl_object_emit when parsing and emitting an object created in UCL_PARSER_ZEROCOPY mode, if the input UCL contains a key with an embedded null byte (\u0000).