{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-88829", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-09-10T09:42:04.558Z", "datePublished": "2026-10-14T10:00:42.946Z", "dateUpdated": "2026-10-14T10:00:42.946Z"}, "containers": {"cna": {"title": "Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "busybox", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:hummingbird:1"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-88829", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531343", "name": "RHBZ#2531343", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-10-14T08:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-444", "description": "Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')", "workarounds": [{"lang": "en", "value": "Do not use BusyBox httpd P: rules as the sole path-based access control in front of sensitive backends. Remove P: lines if proxying is not required, or place a full reverse proxy (for example nginx or HAProxy) in front of the backend. Recompile with FEATURE_HTTPD_PROXY disabled if the applet is not needed."}], "timeline": [{"lang": "en", "time": "2026-09-07T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-10-14T08:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-10-14T10:00:42.946Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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{"affected": [{"affectedData": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:hummingbird:1"], "defaultStatus": "affected", "packageName": "busybox", "product": "Red Hat Hardened Images", "vendor": "Red Hat"}], "source": "secalert@redhat.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy."}], "id": "CVE-2026-88829", "lastModified": "2026-10-14T10:17:57.077", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.7, "source": "secalert@redhat.com", "type": "Primary"}]}, "published": "2026-10-14T10:17:57.077", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-88829"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531343"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "secalert@redhat.com", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue.", "bugzilla": {"description": "busybox: busybox: HTTP request smuggling via pipelined requests in httpd reverse proxy", "id": "2531343", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531343"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy."], "mitigation": {"lang": "en:us", "value": "Do not use BusyBox httpd P: rules as the sole path-based access control in front of sensitive backends. Remove P: lines if proxying is not required, or place a full reverse proxy (for example nginx or HAProxy) in front of the backend. Recompile with FEATURE_HTTPD_PROXY disabled if the applet is not needed."}, "name": "CVE-2026-88829", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "busybox", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-14T08:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88829\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88829"], "statement": "Red Hat product impact analysis is pending. Fedora ships busybox with CONFIG_FEATURE_HTTPD_PROXY enabled and is affected when P: reverse proxy rules are used. RHEL does not ship busybox as a standard package. The flaw applies only where httpd.conf defines P: directives that are meant to limit which backend URL paths are reachable through the proxy. It does not apply to static/CGI-only httpd without proxy rules. BusyBox does not enforce httpd Basic authentication on proxied URLs by design; that behavior is not part of this CVE.", "threat_severity": "Moderate"}

{"created": "2026-10-14T15:30:03.399922+00:00", "updated": "2026-10-14T15:30:03.399936+00:00", "vendors": []}