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Vulnerabilities / CVE-2023-25725

critical

CVE-2023-25725

haproxy: request smuggling attack in HTTP/1 header parsing

Published Modified CWE 444
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Red Hat8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Bitnami9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD, Bitnami, CBL-Mariner, Photon OS. Rated lower by Red Hat (high), AlmaLinux (medium), Oracle (medium), Ubuntu (medium).

Description

HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29, and 2.0.31.

Affected packages and fixed versions

SourcePackageFixed in
bitnami::Bitnami Vulnerability Databasehaproxy2.0.31, 2.2.29, 2.4.22, 2.5.12, 2.6.9, 2.7.3
CBL-Mariner 1.0haproxy0:2.1.5-2.cm1
CBL-Mariner 2.0haproxy0:2.4.22-1.cm2
Photon OS 3.0haproxy2.2.6-5.ph3
Photon OS 4.0haproxy, haproxy-doc2.6.0-2.ph4
Photon OS 5.0haproxy, haproxy-doc2.7.3-1.ph5
alma 9haproxy2.4.17-3.el9_1.2
debian 10haproxy1.8.19-1+deb10u4
debian 11haproxy2.2.9-2+deb11u4
debian 12haproxy2.6.8-2
debian 13haproxy2.6.8-2
debian 14haproxy2.6.8-2
Show all 33 entries from 30 sources
SourcePackageFixed in
bitnami::Bitnami Vulnerability Databasehaproxy2.0.31, 2.2.29, 2.4.22, 2.5.12, 2.6.9, 2.7.3
CBL-Mariner 1.0haproxy0:2.1.5-2.cm1
CBL-Mariner 2.0haproxy0:2.4.22-1.cm2
Photon OS 3.0haproxy2.2.6-5.ph3
Photon OS 4.0haproxy2.6.0-2.ph4
Photon OS 4.0haproxy-doc2.6.0-2.ph4
Photon OS 5.0haproxy2.7.3-1.ph5
Photon OS 5.0haproxy-doc2.7.3-1.ph5
alma 9haproxy2.4.17-3.el9_1.2
debian 10haproxy1.8.19-1+deb10u4
debian 11haproxy2.2.9-2+deb11u4
debian 12haproxy2.6.8-2
debian 13haproxy2.6.8-2
debian 14haproxy2.6.8-2
echohaproxy2.6.8-2
Oracle Linux 9haproxy2.4.17-3.el9_1.2
rapidfort Oracle Linux 9haproxy0:2.4.17-3.el9_1.2
rapidfort ubuntu 20.04haproxy0:2.4.18-0ubuntu1.2
rapidfort ubuntu 22.04haproxy0:2.4.18-0ubuntu1.2
rapidfort ubuntu 24.04haproxy0:2.4.18-0ubuntu1.2
Red Hathaproxyno fix listed
Red Hathaproxy18no fix listed
ubuntu 16.04-ESMhaproxy1.6.3-1ubuntu0.3+esm2
ubuntu 18.04haproxy1.8.8-1ubuntu0.13
ubuntu 18.04-ESMhaproxy1.8.8-1ubuntu0.13
ubuntu 20.04haproxy2.0.29-0ubuntu1.3
ubuntu 20.04-ESMhaproxy2.0.29-0ubuntu1.3
ubuntu 22.04haproxy2.4.18-0ubuntu1.2
ubuntu 22.10haproxy2.4.18-1ubuntu1.2
ubuntu 23.04haproxy2.6.9-1ubuntu1
ubuntu 23.10haproxy2.6.9-1ubuntu1
ubuntu 24.04haproxy2.6.9-1ubuntu1
ubuntu 24.10haproxy2.6.9-1ubuntu1

References

All 19 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.