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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["mux-h1"], "product": "HAProxy", "programFiles": ["src/h1_htx.c"], "programRoutines": [{"name": "h1_parse_msg_data"}], "repo": "https://git.haproxy.org/git/haproxy.git", "vendor": "HAProxy", "versions": [{"lessThan": "3.0.30", "status": "affected", "version": "3.0.0", "versionType": "custom"}, {"lessThan": "3.2.26", "status": "affected", "version": "3.2.0", "versionType": "custom"}, {"lessThan": "3.3.17", "status": "affected", "version": "3.3.0", "versionType": "custom"}, {"lessThan": "3.4.6", "status": "affected", "version": "3.4.0", "versionType": "custom"}, {"lessThan": "3.5-dev9", "status": "affected", "version": "3.5-dev", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "HAProxy Enterprise Edition", "vendor": "HAProxy", "versions": [{"lessThan": "3.0r1-362.1441", "status": "affected", "version": "3.0r1", "versionType": "custom"}, {"lessThan": "3.2r1-378.1259", "status": "affected", "version": "3.2r1", "versionType": "custom"}, {"lessThan": "3.3r1-377.1005", "status": "affected", "version": "3.3r1", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "HAProxy Kubernetes Ingress Controller", "vendor": "HAProxy Technologies", "versions": [{"lessThan": "3.2.17", "status": "affected", "version": "3.2.0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "Kubernetes Ingress Controller Enterprise", "vendor": "HAProxy Technologies", "versions": [{"lessThan": "3.2.17-ee1", "status": "affected", "version": "3.2.0", "versionType": "custom"}, {"lessThan": "3.0.16-ee17", "status": "affected", "version": "3.0", "versionType": "custom"}, {"lessThan": "1.11.14-ee11", "status": "affected", "version": "1.11", "versionType": "custom"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted."}], "id": "CVE-2026-110354", "lastModified": "2026-10-22T03:16:31.427", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-10-22T03:16:31.427", "references": [{"source": "cve@mitre.org", "url": "https://git.haproxy.org/?p=haproxy.git;a=commit;h=077906da140a35873bf451d7e9f67646c9f37c81"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "cve@mitre.org", "type": "Primary"}]}

{"bugzilla": {"description": "haproxy: haproxy: Denial of Service via specially crafted HTTP/1.1 chunked request", "id": "2558749", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558749"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["A flaw was found in haproxy. A remote, unauthenticated attacker can trigger a denial of service (DoS) by sending a specially crafted HTTP/1.1 chunked request. When processing the request, the parser repeatedly re-evaluates the same data without making forward progress, trapping the worker thread in a continuous loop that consumes 100% CPU. Multiple malicious requests can exhaust all worker threads, rendering the proxy completely unresponsive until restarted."], "name": "CVE-2026-110354", "package_state": [{"cpe": "cpe:/a:redhat:ceph_storage:5", "fix_state": "Fix deferred", "package_name": "haproxy", "product_name": "Red Hat Ceph Storage 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "haproxy", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "haproxy", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "haproxy", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "haproxy", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "haproxy", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "haproxy", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-22T02:46:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-110354\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-110354\nhttps://git.haproxy.org/?p=haproxy.git;a=commit;h=077906da140a35873bf451d7e9f67646c9f37c81"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0,3.0.30)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.0,3.2.26)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.3.0,3.3.17)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.0,3.4.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.5-dev,3.5-dev9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "HAProxy", "source": "cna", "vendor": "HAProxy"}, "product": "haproxy", "vendor": "haproxy"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.0r1,3.0r1-362.1441)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.2r1,3.2r1-378.1259)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.3r1,3.3r1-377.1005)"}}], "enrichment": {"confidence": 87.0, "confidence_source": "matching", "scores": [{"score": 87.0, "source": "matching"}]}, "original": {"product": "HAProxy Enterprise Edition", "source": "cna", "vendor": "HAProxy"}, "product": "haproxy_enterprise", "vendor": "haproxy"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.0,3.2.17)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "HAProxy Kubernetes Ingress Controller", "source": "cna", "vendor": "HAProxy Technologies"}, "product": "kubernetes_ingress_controller", "vendor": "haproxy"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.2.0,3.2.17-ee1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.0,3.0.16-ee17)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.11,1.11.14-ee11)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Kubernetes Ingress Controller Enterprise", "source": "cna", "vendor": "HAProxy Technologies"}, "product": "kubernetes_ingress_controller_enterprise", "vendor": "haproxy"}], "created": "2026-10-22T05:45:14.854140+00:00", "title": "Remote Denial of Service via HTTP Chunked Request in HAProxy", "updated": "2026-10-22T10:39:14.320521+00:00", "vendors": ["haproxy", "haproxy$PRODUCT$haproxy", "haproxy$PRODUCT$haproxy_enterprise", "haproxy$PRODUCT$kubernetes_ingress_controller", "haproxy$PRODUCT$kubernetes_ingress_controller_enterprise"]}