Fix CVE(s): CVE-2026-94054, CVE-2026-94056
* SECURITY UPDATE: out-of-bounds access in Proxy-Protocol v1 header parsing with an attacker-controlled proxy - debian/patches/CVE-2026-94054.patch: set ret to the length of the heap copy of the PROXY v1 line instead of adding the swallow_until_crlf() count, so the memchr() for the CR stays inside the copy - CVE-2026-94054 * SECURITY UPDATE: uninitialised stack data read on a short Proxy-Protocol v2 header from an attacker-controlled proxy - debian/patches/CVE-2026-94056.patch: repeat the read of the v2 length fields until all 16 header octets have arrived, and abort on EOF or error instead of using uninitialised length data - CVE-2026-94056
- Products
- exim4, exim4-base, exim4-config, exim4-daemon-heavy, exim4-daemon-light, exim4-dev, eximon4
- Affected versions
- Not specified
- Fixed versions
- 4.93-13ubuntu1.12+tuxcare.els4
- CVEs
- CVE-2026-94054, CVE-2026-94056
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:00 UTC · Revision 1
Source evidence
* SECURITY UPDATE: out-of-bounds access in Proxy-Protocol v1 header parsing with an attacker-controlled proxy - debian/patches/CVE-2026-94054.patch: set ret to the length of the heap copy of the PROXY v1 line instead of adding the swallow_until_crlf() count, so the memchr() for the CR stays inside the copy - CVE-2026-94054 * SECURITY UPDATE: uninitialised stack data read on a short Proxy-Protocol v2 header from an attacker-controlled proxy - debian/patches/CVE-2026-94056.patch: repeat the read of the v2 length fields until all 16 header octets have arrived, and abort on EOF or error instead of using uninitialised length data - CVE-2026-94056
osv:CLSA-2026-1791403476
exim4
Fixed versions: 4.93-13ubuntu1.12+tuxcare.els4
exim4-base
Fixed versions: 4.93-13ubuntu1.12+tuxcare.els4
exim4-config
Fixed versions: 4.93-13ubuntu1.12+tuxcare.els4
exim4-daemon-heavy
Fixed versions: 4.93-13ubuntu1.12+tuxcare.els4
exim4-daemon-light
Fixed versions: 4.93-13ubuntu1.12+tuxcare.els4
exim4-dev
Fixed versions: 4.93-13ubuntu1.12+tuxcare.els4
eximon4
Fixed versions: 4.93-13ubuntu1.12+tuxcare.els4
Complete source record
{
"id": "f9292c09d259de4c9aef83aa179b115ce1775749fa84b3d45cd876b9c98b2584",
"url": "https://osv.dev/vulnerability/CLSA-2026-1791403476",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-94054, CVE-2026-94056",
"summary": "* SECURITY UPDATE: out-of-bounds access in Proxy-Protocol v1 header parsing with an attacker-controlled proxy - debian/patches/CVE-2026-94054.patch: set ret to the length of the heap copy of the PROXY v1 line instead of adding the swallow_until_crlf() count, so the memchr() for the CR stays inside the copy - CVE-2026-94054 * SECURITY UPDATE: uninitialised stack data read on a short Proxy-Protocol v2 header from an attacker-controlled proxy - debian/patches/CVE-2026-94056.patch: repeat the read of the v2 length fields until all 16 header octets have arrived, and abort on EOF or error instead of using uninitialised length data - CVE-2026-94056",
"evidence": "osv:CLSA-2026-1791403476",
"products": [
{
"name": {
"value": "exim4",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.93-13ubuntu1.12+tuxcare.els4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "exim4-base",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.93-13ubuntu1.12+tuxcare.els4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "exim4-config",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.93-13ubuntu1.12+tuxcare.els4",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "exim4-daemon-heavy",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.93-13ubuntu1.12+tuxcare.els4",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "exim4-daemon-light",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.93-13ubuntu1.12+tuxcare.els4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "exim4-dev",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.93-13ubuntu1.12+tuxcare.els4",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "eximon4",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.93-13ubuntu1.12+tuxcare.els4",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1791403476",
"aliases": [
"CLSA-2026-1791403476"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.12+tuxcare.els4"
}
]
}
],
"package": {
"name": "exim4",
"purl": "pkg:deb/tuxcare/exim4?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1791403476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.12+tuxcare.els4"
}
]
}
],
"package": {
"name": "exim4-base",
"purl": "pkg:deb/tuxcare/exim4-base?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1791403476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.12+tuxcare.els4"
}
]
}
],
"package": {
"name": "exim4-config",
"purl": "pkg:deb/tuxcare/exim4-config?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1791403476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.12+tuxcare.els4"
}
]
}
],
"package": {
"name": "exim4-daemon-heavy",
"purl": "pkg:deb/tuxcare/exim4-daemon-heavy?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1791403476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.12+tuxcare.els4"
}
]
}
],
"package": {
"name": "exim4-daemon-light",
"purl": "pkg:deb/tuxcare/exim4-daemon-light?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1791403476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.12+tuxcare.els4"
}
]
}
],
"package": {
"name": "exim4-dev",
"purl": "pkg:deb/tuxcare/exim4-dev?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1791403476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.12+tuxcare.els4"
}
]
}
],
"package": {
"name": "eximon4",
"purl": "pkg:deb/tuxcare/eximon4?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1791403476.json"
}
}
],
"modified": "2026-10-26T09:31:40.200035495Z",
"provider": "osv",
"upstream": [
"CVE-2026-94054",
"CVE-2026-94056"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1791403476.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-94054",
"https://nvd.nist.gov/vuln/detail/CVE-2026-94056"
]
},
"related_cves": [
{
"value": "CVE-2026-94054",
"evidence": "/upstream"
},
{
"value": "CVE-2026-94056",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448046,
"published_at": "2026-10-07T20:04:49+00:00"
}