Vendor
HAProxy Security Bypass Vulnerability
1 TTPA vulnerability in HAProxy (CVE-2023-45538) allows remote, unauthenticated attackers to bypass security restrictions, manipulate data, and trigger denial-of-service conditions.
Ted Backdoor Implant in Trojanized HAProxy Binaries
3 TTPs 8 IOCsNorth Korean state-sponsored actors are deploying a sophisticated Linux backdoor named 'ted' by replacing legitimate HAProxy binaries with trojanized versions to intercept web traffic and execute malicious commands.
Service Exhaustion via Stalled TLS ALPN Handshakes
1 TTP 2 CVEs 2 IOCsAttackers are exploiting unpatched TLS listeners by flooding them with incomplete ACME ALPN handshakes to exhaust server-side resources like goroutines and worker threads.
HAProxy Denial of Service Vulnerability (CVE-2026-26080)
1 CVEA denial of service vulnerability (CVE-2026-26080) in HAProxy Community Edition versions 3.2.x through 3.3.x before 3.3.3, HAProxy Enterprise, and ALOHA can lead to a loop or crash due to mishandled varint, impacting service availability.
HAProxy CVE-2021-40346 Integer Overflow Leading to HTTP Request Smuggling and ACL Bypass
2 TTPs 1 CVEA critical integer overflow vulnerability, CVE-2021-40346, in HAProxy's `htx_add_header()` function allows unauthenticated attackers to bypass access control rules by crafting HTTP requests with specific header name lengths, leading to HTTP request smuggling and unauthorized access to backend paths, for which a public exploit is available.
CVE-2026-55203 HAProxy Integer Overflow in FastCGI Handling
2 rules 3 TTPsAn integer overflow vulnerability (CVE-2026-55203) in HAProxy through version 3.4.0 allows malicious FastCGI backends to desynchronize the FCGI framing parser, leading to request routing errors, response smuggling, or memory safety issues.