crítica
CVE-2026-55203
haproxy: HAProxy: Response smuggling due to integer overflow in FastCGI record length handling
En la Trivy database desde, como mínimo, el 24 oct 2026, 07:11 UTCNo consta cuándo entró antes de ese build.
Severidad por fuente
NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Red Hat7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
Bitnami9.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N
La etiqueta propia de Trivy es CRITICAL. Crítica según NVD, Bitnami. Más baja según Red Hat (alta), AlmaLinux (alta), Azure Linux (alta), Oracle (alta), Rocky Linux (alta), Ubuntu (media).
Descripción
HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's drl field that allows buffer misparse as new FCGI record headers. When contentLength is 65535 and paddingLength is 1 or more, the drl field wraps to 0, causing incorrect record consumption and allowing malicious FastCGI backends to desynchronize the FCGI framing parser, potentially causing request routing errors, response smuggling, or memory safety issues.
Paquetes afectados y versiones corregidas
| Fuente | Paquete | Corregido en |
|---|---|---|
| bitnami::Bitnami Vulnerability Database | haproxy | 2.4.36, 2.6.30, 2.8.25, 3.0.24, 3.2.20, 3.4.1 |
| alma 10 | haproxy | 3.0.5-6.el10_2.2 |
| alma 9 | haproxy | 2.8.14-3.el9_8.2 |
| Azure Linux 3.0 | haproxy | 0:2.9.11-7.azl3 |
| chainguard | haproxy-2.4, haproxy-2.6, haproxy-2.8 y 3 más | 2.4.36-r0 y 5 más |
| debian 11 | haproxy | sin corrección indicada |
| debian 12 | haproxy | sin corrección indicada |
| debian 13 | haproxy | sin corrección indicada |
| debian 14 | haproxy | 3.2.20-1 |
| echo | haproxy | sin corrección indicada |
| minimos | haproxy-2.6, haproxy-2.8, haproxy-3.0 y 2 más | 2.6.30-r0 y 4 más |
| Oracle Linux 9 | haproxy | 2.8.14-3.el9_8.2 |
Mostrar las 49 entradas de 34 fuentes
| Fuente | Paquete | Corregido en |
|---|---|---|
| bitnami::Bitnami Vulnerability Database | haproxy | 2.4.36, 2.6.30, 2.8.25, 3.0.24, 3.2.20, 3.4.1 |
| alma 10 | haproxy | 3.0.5-6.el10_2.2 |
| alma 9 | haproxy | 2.8.14-3.el9_8.2 |
| Azure Linux 3.0 | haproxy | 0:2.9.11-7.azl3 |
| chainguard | haproxy-2.4 | 2.4.36-r0 |
| chainguard | haproxy-2.6 | 2.6.31-r0 |
| chainguard | haproxy-2.8 | 2.8.26-r0 |
| chainguard | haproxy-3.0 | 3.0.24-r0 |
| chainguard | haproxy-3.2 | 3.2.20-r0 |
| chainguard | haproxy-3.3 | 3.3.11-r0 |
| debian 11 | haproxy | sin corrección indicada |
| debian 12 | haproxy | sin corrección indicada |
| debian 13 | haproxy | sin corrección indicada |
| debian 14 | haproxy | 3.2.20-1 |
| echo | haproxy | sin corrección indicada |
| minimos | haproxy-2.6 | 2.6.30-r0 |
| minimos | haproxy-2.8 | 2.8.25-r0 |
| minimos | haproxy-3.0 | 3.0.24-r0 |
| minimos | haproxy-3.2 | 3.2.20-r0 |
| minimos | haproxy-3.4 | 3.4.1-r0 |
| Oracle Linux 9 | haproxy | 2.8.14-3.el9_8.2 |
| rapidfort alma 10 | haproxy | 3.0.5-6.el10_2.2 |
| rapidfort alma 9 | haproxy | 2.8.14-3.el9_8.2 |
| rapidfort alpine 3.20 | haproxy | 3.0.24-r0 |
| rapidfort alpine 3.21 | haproxy | 3.0.24-r0 |
| rapidfort amazon linux 2023 | haproxy | 3.0.23-2.amzn2023.0.1 |
| rapidfort debian 12 | haproxy | 0:3.2.20-1 |
| rapidfort debian 13 | haproxy | 0:3.2.20-1 |
| rapidfort fedora 43 | haproxy | 3.0.24-1.fc43 |
| rapidfort Oracle Linux 10 | haproxy | 0:3.0.5-6.el10_2.2 |
| rapidfort Oracle Linux 9 | haproxy | 0:2.8.14-3.el9_8.2 |
| rapidfort rocky 9 | haproxy | 0:2.8.14-3.el9_8.2 |
| rapidfort ubuntu 20.04 | haproxy | 0:2.4.30-0ubuntu0.22.04.2, 0:2.8.16-0ubuntu0.24.04.3, 0:3.2.9-1ubuntu2.2 |
| rapidfort ubuntu 22.04 | haproxy | 0:2.4.30-0ubuntu0.22.04.2, 0:2.8.16-0ubuntu0.24.04.3, 0:3.2.9-1ubuntu2.2 |
| rapidfort ubuntu 24.04 | haproxy | 0:2.4.30-0ubuntu0.22.04.2, 0:2.8.16-0ubuntu0.24.04.3, 0:3.2.9-1ubuntu2.2 |
| Red Hat | haproxy | sin corrección indicada |
| Red Hat | haproxy28 | sin corrección indicada |
| Red Hat | rhceph-ci/haproxy | sin corrección indicada |
| Red Hat | rhceph/rhceph-haproxy-rhel10 | sin corrección indicada |
| Red Hat | rhceph/rhceph-haproxy-rhel8 | sin corrección indicada |
| Red Hat | rhceph/rhceph-haproxy-rhel9 | sin corrección indicada |
| rocky 10 | haproxy | 0.0.0 |
| rocky 9 | haproxy | 2.8.14-3.el9_8.2 |
| ubuntu 22.04 | haproxy | 2.4.30-0ubuntu0.22.04.2 |
| ubuntu 24.04 | haproxy | 2.8.16-0ubuntu0.24.04.3 |
| ubuntu 25.10 | haproxy | 3.0.12-0ubuntu0.25.10.5 |
| ubuntu 26.04 | haproxy | 3.2.9-1ubuntu2.2 |
| wolfi | haproxy-3.2 | 3.2.20-r0 |
| wolfi | haproxy-3.3 | 3.3.11-r0 |
Referencias
- https://access.redhat.com/errata/RHSA-2026:55772
- https://access.redhat.com/security/cve/CVE-2026-55203
- https://bugzilla.redhat.com/2490518
- https://bugzilla.redhat.com/2490522
- https://bugzilla.redhat.com/show_bug.cgi?id=2490518
- https://bugzilla.redhat.com/show_bug.cgi?id=2490522
- https://creativecommons.org/licenses/by/4.0/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-55203
Las 18 referencias
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-55204
- https://errata.almalinux.org/9/ALSA-2026-55772.html
- https://errata.rockylinux.org/RLSA-2026:55772
- https://github.com/haproxy/haproxy/commit/5985276735777634d8c85f1d73bb7764aab0d6dd
- https://linux.oracle.com/cve/CVE-2026-55203.html
- https://linux.oracle.com/errata/ELSA-2026-55772.html
- https://nvd.nist.gov/vuln/detail/CVE-2026-55203
- https://ubuntu.com/security/notices/USN-8459-1
- https://www.cve.org/CVERecord?id=CVE-2026-55203
- https://www.vulncheck.com/advisories/haproxy-integer-overflow-in-fcgi-demux-record-length-field