--- title: "CVE-2026-110353: HAProxy - Denial of Service" description: "HAProxy < 3.4.6 contains a denial of service caused by improper handling of truncated HTTP/2 PING frames in h2c_handle_ping, letting remote unauthenticated attackers exhaust CPU via repeated wakeups, exploit requires sending truncated frames." url: https://panop.io/threat-heartbeat/CVE-2026-110353/ --- # CVE-2026-110353 HAProxy - Denial of Service HAProxy < 3.4.6 contains a denial of service caused by improper handling of truncated HTTP/2 PING frames in h2c\_handle\_ping, letting remote unauthenticated attackers exhaust CPU via repeated wakeups, exploit requires sending truncated frames. CVSS base score 7.5 /10 High CISA KEV Not listed Public exploit None known Authentication Not required EPSS 0.68% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-110353) ## Details Type Denial of Service Impact Denial Of Service CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Published 22 October 2026 Updated 23 October 2026 Weakness [CWE-252](https://cwe.mitre.org/data/definitions/252.html) ## Vendor fix Upgrade to version 3.4.6 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-110353](https://nvd.nist.gov/vuln/detail/CVE-2026-110353) - [https://git.haproxy.org/?p=haproxy.git;a=commit;h=cec63e95f62a7412484f1134f5aa227e5b7e1466](https://git.haproxy.org/?p=haproxy.git;a=commit;h=cec63e95f62a7412484f1134f5aa227e5b7e1466) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)