CVE-2026-110353
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-252 |
| Vendor | haproxy |
| Product | haproxy |
| Published | Oct 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
HAProxy / HAProxy
3.2.0 < 3.2.26 3.3.0 < 3.3.17 3.4.0 < 3.4.6 3.5-dev < 3.5-dev9
HAProxy / HAProxy Enterprise Edition
3.2.0r1 < 3.2r1-378.1259 3.3.0r1 < 3.3r1-377.1005
HAProxy / Kubernetes Ingress Controller
3.2.0 < 3.2.17
Haproxy / Kubernetes Ingress Controller Enterprise
3.2.0 < 3.2.17-ee1 3.0 < 3.0.16-ee17 1.11 < 1.11.14-ee11