Bug 2543013

Summary: CVE-2026-102474 dash: dash: Heap out-of-bounds write in conv_escape via undersized Unicode escape reservation [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Ganesh <gnaik>
Component: dashAssignee: Huzaifa S. Sidhpurwala <huzaifas>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: dcantrell, huzaifas, maxim, svashisht
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["ce531612-63dd-414f-9775-d3a97f16129f"]}
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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: 2543004    

Description Ganesh 2026-09-29 08:54:41 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 dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.