{"id":"CVE-2026-110353","revision":"8b74bd850ce943b0875ce0503e75867a","records":[{"revision":"8b74bd850ce943b0875ce0503e75867a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-110353","aliases":[],"title":"HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the oth…","description":"HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.","state":0,"publishedAt":"2026-10-22T02:53:33.198+00:00","modifiedAt":"2026-10-22T19:10:34.428+00:00","affected":[{"ecosystem":"Vendor product","name":"HAProxy","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"mux-h2\"\n                    ],\n                    \"product\": \"HAProxy\",\n                    \"programFiles\": [\n                        \"src/mux_h2.c\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"h2c_handle_ping\"\n                        }\n                    ],\n                    \"repo\": \"https://git.haproxy.org/git/haproxy.git/\",\n                    \"vendor\": \"HAProxy\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"3.2.26\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.2.0\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"3.3.17\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.3.0\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"3.4.6\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.4.0\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"3.5-dev9\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.5-dev\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"HAProxy Enterprise Edition","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"HAProxy Enterprise Edition\",\n                    \"vendor\": \"HAProxy\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"3.2r1-378.1259\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.2.0r1\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"3.3r1-377.1005\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.3.0r1\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Kubernetes Ingress Controller","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"Kubernetes Ingress Controller\",\n                    \"vendor\": \"HAProxy\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"3.2.17\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.2.0\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Kubernetes Ingress Controller Enterprise","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"Kubernetes Ingress Controller Enterprise\",\n                    \"vendor\": \"Haproxy\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"3.2.17-ee1\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.2.0\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"3.0.16-ee17\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.0\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"1.11.14-ee11\",\n                            \"status\": \"affected\",\n                            \"version\": \"1.11\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.haproxy.org/?p=haproxy.git;a=commit;h=cec63e95f62a7412484f1134f5aa227e5b7e1466"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-110353","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-110353","identifiers":["CVE-2026-110353"]},"retained":false,"historicalAffected":[]}],"coverage":[]}