Bug 2538991 (CVE-2026-88341)

Summary: CVE-2026-88341 yara: YARA: Denial of Service via crafted compiled rule file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in YARA. A remote attacker could exploit this vulnerability by providing a specially crafted compiled rule file (.yrc) with an invalid arena configuration. This malicious file, when loaded, triggers an assertion failure, leading to the application's termination. This results in a denial of service.
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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: 2539101    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-22 21:55:54 UTC
A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule files. An attacker can provide a malicious file with an invalid arena configuration (num_buffers=0) that triggers an assertion failure in yr_arena_get_ptr(), causing the application to terminate.