usn-8459-1
Vulnerability from osv_ubuntu
Published
2026-06-22 13:55
Modified
2026-06-29 10:54
Summary
haproxy vulnerabilities
Details
It was discovered that HAProxy incorrectly handled the FCGI demultiplexer record length field. A remote attacker could possibly use this issue to cause incorrect request routing, response smuggling, or other memory safety issues. (CVE-2026-55203)
It was discovered that HAProxy failed to validate the return value of the HPACK dynamic table defragmentation function when memory was exhausted. A remote attacker could possibly use this issue to cause HAProxy to crash, resulting in a denial of service. (CVE-2026-55204)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-55203",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-55204",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "haproxy",
"binary_version": "2.4.30-0ubuntu0.22.04.2"
},
{
"binary_name": "vim-haproxy",
"binary_version": "2.4.30-0ubuntu0.22.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "haproxy",
"purl": "pkg:deb/ubuntu/haproxy@2.4.30-0ubuntu0.22.04.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.30-0ubuntu0.22.04.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.9-2ubuntu2",
"2.4.8-1",
"2.4.8-2ubuntu3",
"2.4.11-1ubuntu1",
"2.4.12-1ubuntu1",
"2.4.12-1ubuntu2",
"2.4.13-1ubuntu1",
"2.4.14-1ubuntu1",
"2.4.18-0ubuntu1",
"2.4.18-0ubuntu1.1",
"2.4.18-0ubuntu1.2",
"2.4.18-0ubuntu1.3",
"2.4.22-0ubuntu0.22.04.1",
"2.4.22-0ubuntu0.22.04.2",
"2.4.22-0ubuntu0.22.04.3",
"2.4.24-0ubuntu0.22.04.1",
"2.4.24-0ubuntu0.22.04.2",
"2.4.24-0ubuntu0.22.04.3",
"2.4.29-0ubuntu0.22.04.1",
"2.4.30-0ubuntu0.22.04.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-55203",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-55204",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "haproxy",
"binary_version": "2.8.16-0ubuntu0.24.04.3"
},
{
"binary_name": "vim-haproxy",
"binary_version": "2.8.16-0ubuntu0.24.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "haproxy",
"purl": "pkg:deb/ubuntu/haproxy@2.8.16-0ubuntu0.24.04.3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.8.16-0ubuntu0.24.04.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.6.15-1ubuntu2",
"2.8.5-1ubuntu1",
"2.8.5-1ubuntu2",
"2.8.5-1ubuntu3",
"2.8.5-1ubuntu3.1",
"2.8.5-1ubuntu3.2",
"2.8.5-1ubuntu3.3",
"2.8.5-1ubuntu3.4",
"2.8.15-0ubuntu0.24.04.1",
"2.8.16-0ubuntu0.24.04.1",
"2.8.16-0ubuntu0.24.04.2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-55203",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-55204",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:25.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "haproxy",
"binary_version": "3.0.12-0ubuntu0.25.10.5"
},
{
"binary_name": "vim-haproxy",
"binary_version": "3.0.12-0ubuntu0.25.10.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "haproxy",
"purl": "pkg:deb/ubuntu/haproxy@3.0.12-0ubuntu0.25.10.5?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.12-0ubuntu0.25.10.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.8-1ubuntu1",
"3.0.8-1ubuntu1.1",
"3.0.10-1ubuntu1",
"3.0.10-1ubuntu2",
"3.0.10-1ubuntu3",
"3.0.12-0ubuntu0.25.10.1",
"3.0.12-0ubuntu0.25.10.3",
"3.0.12-0ubuntu0.25.10.4"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-55203",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-55204",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "haproxy",
"binary_version": "3.2.9-1ubuntu2.2"
},
{
"binary_name": "vim-haproxy",
"binary_version": "3.2.9-1ubuntu2.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "haproxy",
"purl": "pkg:deb/ubuntu/haproxy@3.2.9-1ubuntu2.2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.2.9-1ubuntu2.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.10-1ubuntu3",
"3.2.9-1ubuntu1",
"3.2.9-1ubuntu2",
"3.2.9-1ubuntu2.1"
]
}
],
"aliases": [],
"details": "It was discovered that HAProxy incorrectly handled the FCGI demultiplexer\nrecord length field. A remote attacker could possibly use this issue to\ncause incorrect request routing, response smuggling, or other memory safety\nissues. (CVE-2026-55203)\n\nIt was discovered that HAProxy failed to validate the return value of the\nHPACK dynamic table defragmentation function when memory was exhausted. A\nremote attacker could possibly use this issue to cause HAProxy to crash,\nresulting in a denial of service. (CVE-2026-55204)",
"id": "USN-8459-1",
"modified": "2026-06-29T10:54:22Z",
"published": "2026-06-22T13:55:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8459-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55203"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55204"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "haproxy vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-55203",
"UBUNTU-CVE-2026-55204"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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