Bug 2567653 (CVE-2026-115473)

Summary: CVE-2026-115473 mongoose: Mongoose: Denial of service via out-of-bounds read during path validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Mongoose. Due to missing length validation during path sanitization, an unauthenticated remote attacker can trigger a heap out-of-bounds read by sending specially crafted HTTP requests with malformed short paths. This allows the application to read memory beyond allocated buffer boundaries, which may lead to a denial of service (DoS) by causing the service to crash, or result in information disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-05 22:15:15 UTC 
Mongoose is an embedded web server and network library. Prior to 7.22, mg_path_is_sane in src/util.c read path.buf[1] without first requiring path.len to be at least two and read s[2] when only two bytes remained. Unauthenticated remote requests reaching mg_http_upload or mg_http_serve_dir with the affected short path shapes could therefore trigger one-byte heap out-of-bounds reads. On bare-metal or RTOS targets without memory protection, the adjacent byte could be exposed or influence whether a path was accepted, and instrumented builds could crash. This issue is fixed in version 7.22.