ubuntu-cve-2025-12642
Vulnerability from osv_ubuntu
Published
2025-11-03 20:17
Modified
2026-05-20 15:16
Summary
Details
lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks. Successful exploitation may allow an attacker to: * Bypass access control rules * Inject unsafe input into backend logic that trusts request headers * Execute HTTP Request Smuggling attacks under some conditions This issue affects lighttpd1.4.80
Severity
9.1 (Critical)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-cml",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-magnet",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-mysql-vhost",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-trigger-b4-dl",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.33-1+nmu2ubuntu2.1+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.31-3ubuntu3",
"1.4.33-1ubuntu1",
"1.4.33-1+nmu2ubuntu1",
"1.4.33-1+nmu2ubuntu2",
"1.4.33-1+nmu2ubuntu2.1",
"1.4.33-1+nmu2ubuntu2.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.35-4ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-cml",
"binary_version": "1.4.35-4ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-magnet",
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},
{
"binary_name": "lighttpd-mod-mysql-vhost",
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},
{
"binary_name": "lighttpd-mod-trigger-b4-dl",
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},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.35-4ubuntu2.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.35-4ubuntu2.1+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.35-4ubuntu1",
"1.4.35-4ubuntu2",
"1.4.35-4ubuntu2.1",
"1.4.35-4ubuntu2.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-authn-ldap",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-authn-mysql",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-cml",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-geoip",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-magnet",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-mysql-vhost",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-trigger-b4-dl",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.45-1ubuntu3.18.04.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.45-1ubuntu3.18.04.1+esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.45-1ubuntu1",
"1.4.45-1ubuntu3",
"1.4.45-1ubuntu3+esm1",
"1.4.45-1ubuntu3.18.04",
"1.4.45-1ubuntu3.18.04+esm1",
"1.4.45-1ubuntu3.18.04.1",
"1.4.45-1ubuntu3.18.04.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-authn-pam",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-authn-sasl",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-cml",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-geoip",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-magnet",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-maxminddb",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-trigger-b4-dl",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-vhostdb-dbi",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-vhostdb-pgsql",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.55-1ubuntu1.20.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.55-1ubuntu1.20.04.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.53-4ubuntu2",
"1.4.54-2ubuntu1",
"1.4.55-1ubuntu1",
"1.4.55-1ubuntu1.20.04.1",
"1.4.55-1ubuntu1.20.04.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-authn-pam",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-authn-sasl",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-deflate",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-geoip",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-maxminddb",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-mbedtls",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-nss",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-openssl",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-trigger-b4-dl",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-vhostdb-pgsql",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-mod-wolfssl",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-modules-dbi",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-modules-lua",
"binary_version": "1.4.63-1ubuntu3.1"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.63-1ubuntu3.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.63-1ubuntu3.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.59-1ubuntu2",
"1.4.59-1ubuntu3",
"1.4.63-1ubuntu1",
"1.4.63-1ubuntu2",
"1.4.63-1ubuntu3",
"1.4.63-1ubuntu3.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-authn-pam",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-authn-sasl",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-deflate",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-gnutls",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-maxminddb",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-mbedtls",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-nss",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-openssl",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-vhostdb-pgsql",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-mod-wolfssl",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-modules-dbi",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-modules-lua",
"binary_version": "1.4.74-1ubuntu3"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.74-1ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.74-1ubuntu3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.69-1ubuntu1",
"1.4.69-1ubuntu2",
"1.4.73-1ubuntu1",
"1.4.73-1ubuntu2",
"1.4.74-1ubuntu2",
"1.4.74-1ubuntu3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-authn-pam",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-authn-sasl",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-deflate",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-gnutls",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-maxminddb",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-mbedtls",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-nss",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-openssl",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-vhostdb-pgsql",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-mod-wolfssl",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-dbi",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-lua",
"binary_version": "1.4.82-2ubuntu1"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.82-2ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.82-2ubuntu1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.79-1ubuntu1",
"1.4.79-2ubuntu1",
"1.4.82-2ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-authn-gssapi",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-authn-pam",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-authn-sasl",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-deflate",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-gnutls",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-maxminddb",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-mbedtls",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-nss",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-openssl",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-vhostdb-pgsql",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-mod-wolfssl",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-dbi",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-ldap",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-lua",
"binary_version": "1.4.82-2ubuntu2"
},
{
"binary_name": "lighttpd-modules-mysql",
"binary_version": "1.4.82-2ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd@1.4.82-2ubuntu2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.82-2ubuntu1",
"1.4.82-2ubuntu2"
]
}
],
"aliases": [],
"details": "lighttpd1.4.80 incorrectly merged trailer fields into headers\u00a0after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks. Successful exploitation may allow an attacker to: * Bypass access control rules * Inject unsafe input into backend logic that trusts request headers * Execute HTTP Request Smuggling attacks under some conditions This issue affects lighttpd1.4.80",
"id": "UBUNTU-CVE-2025-12642",
"modified": "2026-05-20T15:16:02Z",
"published": "2025-11-03T20:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-12642"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-12642"
},
{
"type": "REPORT",
"url": "https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2025-12642"
]
}
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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.
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- 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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