# HAProxy vulnerabilities

Source: https://junglewise.ai/threats/vendors/haproxy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/haproxy.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 8 vulnerabilities in HAProxy: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-110354, was published on 22 October 2026. 2 vulnerabilities in the last four weeks, up from none in the four before. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 2
- Last 90 days: 3
- All time: 8 (0 critical, 0 exploited in the wild)

## About HAProxy

HAProxy is a provider of high-availability load balancing and proxying software for TCP and HTTP applications.

## Latest HAProxy vulnerabilities

- [CVE-2026-110354: HAProxy denial of service in HTTP/1.1 chunked request parsing](https://junglewise.ai/threats/cve-2026-110354-haproxy-3-before-3-4-6-allows-a-remote-unauthenticated-attacker) (high, CVSS 7.5, published 22 Oct 2026)
- [CVE-2026-110353: HAProxy denial of service via truncated HTTP/2 PING frame](https://junglewise.ai/threats/cve-2026-110353-haproxy-3-2-before-3-4-6-allows-a-remote-unauthenticated) (high, CVSS 7.5, published 22 Oct 2026)
- [CVE-2026-90678: HAProxy HTTP request smuggling in HTTP/3 multiplexer](https://junglewise.ai/threats/cve-2026-90678-haproxy-http-request-smuggling-in-http-3-multiplexer) (high, CVSS 7.5, published 13 Sep 2026)
- [CVE-2026-26081: HAProxy missing length check in NEW_TOKEN format handling](https://junglewise.ai/threats/cve-2026-26081-haproxy-missing-length-check-in-new-token-format-handling) (medium, CVSS 4.8, published 20 Jul 2026)
- [CVE-2026-26080: HAProxy denial of service via varint mishandling in QUIC parsing](https://junglewise.ai/threats/cve-2026-26080-haproxy-denial-of-service-via-varint-mishandling-in-quic-parsing) (low, CVSS 3.7, published 20 Jul 2026)
- [CVE-2026-55204: HAProxy NULL pointer dereference in hpack_dht_insert](https://junglewise.ai/threats/cve-2026-55204-haproxy-null-pointer-dereference-in-hpack-dht-insert) (high, CVSS 7.5, published 18 Jun 2026)
- [CVE-2026-55203: HAProxy integer overflow in FCGI demultiplexer](https://junglewise.ai/threats/cve-2026-55203-haproxy-integer-overflow-in-fcgi-demultiplexer) (high, CVSS 7.5, published 18 Jun 2026)
- [CVE-2026-33555: HAProxy request smuggling via HTTP/3 standalone FIN desynchronization](https://junglewise.ai/threats/cve-2026-33555-haproxy-request-smuggling-via-http-3-standalone-fin) (medium, CVSS 4, published 13 Apr 2026)

## Most severe HAProxy vulnerabilities

- [CVE-2026-90678: HAProxy HTTP request smuggling in HTTP/3 multiplexer](https://junglewise.ai/threats/cve-2026-90678-haproxy-http-request-smuggling-in-http-3-multiplexer) (high, CVSS 7.5, published 13 Sep 2026)
- [CVE-2026-110354: HAProxy denial of service in HTTP/1.1 chunked request parsing](https://junglewise.ai/threats/cve-2026-110354-haproxy-3-before-3-4-6-allows-a-remote-unauthenticated-attacker) (high, CVSS 7.5, published 22 Oct 2026)
- [CVE-2026-110353: HAProxy denial of service via truncated HTTP/2 PING frame](https://junglewise.ai/threats/cve-2026-110353-haproxy-3-2-before-3-4-6-allows-a-remote-unauthenticated) (high, CVSS 7.5, published 22 Oct 2026)
- [CVE-2026-55204: HAProxy NULL pointer dereference in hpack_dht_insert](https://junglewise.ai/threats/cve-2026-55204-haproxy-null-pointer-dereference-in-hpack-dht-insert) (high, CVSS 7.5, published 18 Jun 2026)
- [CVE-2026-55203: HAProxy integer overflow in FCGI demultiplexer](https://junglewise.ai/threats/cve-2026-55203-haproxy-integer-overflow-in-fcgi-demultiplexer) (high, CVSS 7.5, published 18 Jun 2026)
- [CVE-2026-26081: HAProxy missing length check in NEW_TOKEN format handling](https://junglewise.ai/threats/cve-2026-26081-haproxy-missing-length-check-in-new-token-format-handling) (medium, CVSS 4.8, published 20 Jul 2026)
- [CVE-2026-33555: HAProxy request smuggling via HTTP/3 standalone FIN desynchronization](https://junglewise.ai/threats/cve-2026-33555-haproxy-request-smuggling-via-http-3-standalone-fin) (medium, CVSS 4, published 13 Apr 2026)
- [CVE-2026-26080: HAProxy denial of service via varint mishandling in QUIC parsing](https://junglewise.ai/threats/cve-2026-26080-haproxy-denial-of-service-via-varint-mishandling-in-quic-parsing) (low, CVSS 3.7, published 20 Jul 2026)

## Vulnerabilities per week

2 vulnerabilities in the last four weeks, up from none in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 1 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 2 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## HAProxy technologies

- [HAProxy](https://junglewise.ai/threats/technologies/haproxy): 6 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "HAProxy vulnerabilities", https://junglewise.ai/threats/vendors/haproxy, 9 November 2026.