Bug 2571770 (CVE-2026-119723)

Summary: CVE-2026-119723 hhvm: hhvm: Denial of Service via crafted nested request parameters
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: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in HHVM. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a specially crafted HTTP GET or POST request containing nested parameters. Due to missing verification when appending nested arrays during request variable parsing, the server process crashes before any application code executes.
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Description OSIDB Bzimport 2026-11-11 17:01:19 UTC 
When parsing request variables such as query-string and form parameters, HHVM did not check that appending a nested array succeeded before descending into it. A remote, unauthenticated attacker could send a GET or POST request which would crash the HHVM server process before any application code runs, leading to denial of service. This issue affected HHVM prior to 23c061f4e804a51badd5f85227e65185651253b5.