Bug 2571612

Summary: CVE-2026-124738 busybox: httpd password rule bypass for pre-compressed .gz files via Accept-Encoding: gzip [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Vladimir Vasilev <vvasilev>
Component: busyboxAssignee: Tom "spot" Callaway <spotrh>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: admiller, davide, dvlasenk, epel-packagers-sig, spotrh, suraj.ghimire7
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["47ff53ec-c174-4e24-98c2-5722b37a981e"]}
Fixed In Version: Doc Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2571610    

Description Vladimir Vasilev 2026-11-11 09:34:02 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 flaw was found in BusyBox's httpd. When FEATURE_HTTPD_GZIP is enabled and a request for /FILE includes an Accept-Encoding: gzip header, httpd serves the pre-compressed FILE.gz if it exists, but authentication rules are matched against the request path only. As a result, a password rule configured for /secret.txt.gz can be bypassed by requesting /secret.txt with Accept-Encoding: gzip, disclosing the contents of the protected file. Only rules naming a specific .gz file are affected; directory rules cover both names.