High Β· published November 19, 2025
β‘ A crafty JSON request can turn HAProxy into a sluggish sloth! π Letβs break down the efficient algorithm complexity issue at play here. Think of it like a busy restaurant where a few diners keep ordering the most complicated dishes β the kitchen gets overwhelmed, and service slows to a crawl. The inefficient algorithm in HAProxy is like that kitchen, struggling under the weight of overly complex requests. If exploited, attackers could bombard your server with these specially crafted JSON requests, causing a denial of service that brings your application to a screeching halt. Your users will experience frustrating downtime, which could lead to loss of trust and business. Thatβs absolutely devastating!
Think of it like a busy restaurant where a few diners keep ordering the most complicated dishes β the kitchen gets overwhelmed, and service slows to a crawl. The inefficient algorithm in HAProxy is like that kitchen, struggling under the weight of overly complex requests. This vulnerability arises from inefficient algorithm complexity in the mjson module of HAProxy, allowing attackers to send customized JSON requests that exploit this inefficiency, leading to resource exhaustion and service slowdown.
If exploited, attackers could bombard your server with these specially crafted JSON requests, causing a denial of service that brings your application to a screeching halt. Your users will experience frustrating downtime, which could lead to loss of trust and business. Thatβs absolutely devastating! To mitigate this issue, update HAProxy to the latest version as soon as possible. Additionally, implement rate limiting on incoming requests to prevent abuse, and monitor your logs for unusual activity that may indicate an ongoing attack. Don't let your service suffer! You've got this! Follow these steps, and you'll keep your application running smoothly and securely! π‘οΈ
| Product | Versions | Fixed in |
|---|---|---|
| haproxy/aloha_appliance | β₯ 14.5.0, < 14.5.33 | 14.5.33 |
| haproxy/aloha_appliance | β₯ 15.5.0, < 15.5.28 | 15.5.28 |
| haproxy/aloha_appliance | β₯ 16.5.0, < 16.5.19 | 16.5.19 |
| haproxy/aloha_appliance | β₯ 17.0.0, < 17.0.7 | 17.0.7 |
| haproxy/haproxy | β₯ 2.4.0, < 2.4.30 | 2.4.30 |
| haproxy/haproxy | β₯ 2.6.0, < 2.6.23 | 2.6.23 |
| haproxy/haproxy | β₯ 2.8.0, < 2.8.16 | 2.8.16 |
| haproxy/haproxy | β₯ 3.0.0, < 3.0.12 | 3.0.12 |
| haproxy/haproxy | β₯ 3.1.0, < 3.1.9 | 3.1.9 |
| haproxy/haproxy | β₯ 3.2.0, < 3.2.6 | 3.2.6 |
| haproxy/haproxy_enterprise | all versions | β |
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| haproxy/kubernetes_ingress_controller | < 1.9.14-ee7 | 1.9.14-ee7 |
| haproxy/kubernetes_ingress_controller | < 3.1.12 | 3.1.12 |
| haproxy/kubernetes_ingress_controller | β₯ 1.10.10-ee1, < 1.11.12-ee10 | 1.11.12-ee10 |
| haproxy/kubernetes_ingress_controller | β₯ 3.0.0-ee1, < 3.0.15-ee4 | 3.0.15-ee4 |