Technology · HAProxy
HAProxy vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 4 vulnerabilities in HAProxy: 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-90678, was published on 13 September 2026.
- Last 7 days
- 0
- Last 90 days
- 1
- Critical, all time
- 0
- Exploited in the wild
- 0
About HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Latest HAProxy vulnerabilities
- CVE-2026-90678: HAProxy HTTP request smuggling in HTTP/3 multiplexerhighCVSS 7.5EPSS 0.8%
- CVE-2026-55204: HAProxy NULL pointer dereference in hpack_dht_inserthighCVSS 7.5
- CVE-2026-55203: HAProxy integer overflow in FCGI demultiplexerhighCVSS 7.5
- CVE-2026-33555: HAProxy request smuggling via HTTP/3 standalone FIN desynchronizationmediumCVSS 4EPSS 0.3%
Most severe HAProxy vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-90678: HAProxy HTTP request smuggling in HTTP/3 multiplexerhighCVSS 7.5EPSS 0.8%
- CVE-2026-55204: HAProxy NULL pointer dereference in hpack_dht_inserthighCVSS 7.5
- CVE-2026-55203: HAProxy integer overflow in FCGI demultiplexerhighCVSS 7.5
- CVE-2026-33555: HAProxy request smuggling via HTTP/3 standalone FIN desynchronizationmediumCVSS 4EPSS 0.3%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 1 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/haproxy.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "HAProxy vulnerabilities", https://junglewise.ai/threats/technologies/haproxy, 26 September 2026.