CVE-2026-110353 (GCVE-0-2026-110353)

Vulnerability from cvelistv5 – Published: 2026-10-22 02:53 – Updated: 2026-10-22 02:53
VLAI
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
mitre CNA under the mitre root
CNA scorecard E 29/100 over 2354 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
HAProxy HAProxy Affected: 3.2.0 , < 3.2.26 (custom)
Affected: 3.3.0 , < 3.3.17 (custom)
Affected: 3.4.0 , < 3.4.6 (custom)
Affected: 3.5-dev , < 3.5-dev9 (custom)
guessed Create a notification for this product.
HAProxy HAProxy Enterprise Edition Affected: 3.2.0r1 , < 3.2r1-378.1259 (custom)
Affected: 3.3.0r1 , < 3.3r1-377.1005 (custom)
guessed Create a notification for this product.
HAProxy Kubernetes Ingress Controller Affected: 3.2.0 , < 3.2.17 (custom)
guessed Create a notification for this product.
Haproxy Kubernetes Ingress Controller Enterprise Affected: 3.2.0 , < 3.2.17-ee1 (custom)
Affected: 3.0 , < 3.0.16-ee17 (custom)
Affected: 1.11 , < 1.11.14-ee11 (custom)
guessed Create a notification for this product.
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{
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          "modules": [
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        }
      ],
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      "references": [
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          "url": "https://git.haproxy.org/?p=haproxy.git;a=commit;h=cec63e95f62a7412484f1134f5aa227e5b7e1466"
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    "datePublished": "2026-10-22T02:53:33.198Z",
    "dateReserved": "2026-10-13T23:18:04.062Z",
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          }
        ],
        "id": "CVE-2026-110353",
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      "title": "haproxy: HAProxy: Denial of Service via truncated HTTP/2 PING frame",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110353.json",
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    }
  }
}



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