UBUNTU-CVE-2026-126083 (CVE-2026-126083)
Vulnerability from osv_ubuntu – Published: 2026-11-12 00:00 – Updated: 2026-11-12 00:00 – Source website
VLAI
Details
Action Pack is a framework for handling and responding to web requests. From 8.1 until 8.1.4.1, Since Rails 8.1.0, ActionDispatch::RemoteIp derives request.remote_ip from Rack::Request#forwarded_for, which under Rack 3 reads the RFC 7239 Forwarded header in preference to X-Forwarded-For. When a reverse proxy appends the client address to X-Forwarded-For but passes a client-supplied Forwarded header through unchanged, request.remote_ip returns an address chosen by the client, and the IP spoofing check does not raise, because it compares only Client-Ip with the forwarded addresses. An unauthenticated attacker could therefore spoof request.remote_ip, possibly bypassing IP-based access controls and rate limits keyed on the client address (including the default by: of rate_limit), and falsifying the client address in logs. An application is affected if it meets all of these requirements: Runs Rails 8.1.0 through 8.1.4 with Rack 3. Under Rack 2.2, forwarded_for reads only X-Forwarded-For. Is served behind a proxy that does not remove or overwrite a client-supplied Forwarded header. Relies on request.remote_ip for access control, rate limiting, or auditing. The fix detects a spoofed Forwarded header only when the proxy also sets X-Forwarded-For. An application whose proxy passes a client-supplied Forwarded header through and sets no X-Forwarded-For remains exposed after upgrading, and should configure the proxy to remove or overwrite Forwarded, or apply the workaround below. This issue is fixed in version 8.1.4.1.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
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{
"binary_name": "rails",
"binary_version": "2:4.2.6-1ubuntu0.1~esm2"
},
{
"binary_name": "ruby-actionmailer",
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{
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},
{
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},
{
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},
{
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},
{
"binary_name": "ruby-activerecord",
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},
{
"binary_name": "ruby-activesupport",
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},
{
"binary_name": "ruby-rails",
"binary_version": "2:4.2.6-1ubuntu0.1~esm2"
},
{
"binary_name": "ruby-railties",
"binary_version": "2:4.2.6-1ubuntu0.1~esm2"
}
]
},
"package": {
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"name": "rails",
"purl": "pkg:deb/ubuntu/rails@2:4.2.6-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
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}
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}
],
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"2:4.2.5-1",
"2:4.2.5.1-1",
"2:4.2.5.2-2",
"2:4.2.6-1",
"2:4.2.6-1ubuntu0.1~esm1",
"2:4.2.6-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
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{
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},
{
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},
{
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},
{
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},
{
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},
{
"binary_name": "ruby-activemodel",
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},
{
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},
{
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},
{
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{
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]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "rails",
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},
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],
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]
},
{
"ecosystem_specific": {
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{
"binary_name": "rails",
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},
{
"binary_name": "ruby-actioncable",
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},
{
"binary_name": "ruby-actionmailer",
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},
{
"binary_name": "ruby-actionpack",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "ruby-actionview",
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},
{
"binary_name": "ruby-activejob",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "ruby-activemodel",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "ruby-activerecord",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "ruby-activestorage",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "ruby-activesupport",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "ruby-rails",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "ruby-railties",
"binary_version": "2:5.2.3+dfsg-3ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "rails",
"purl": "pkg:deb/ubuntu/rails@2:5.2.3+dfsg-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
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{
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],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:5.2.2.1+dfsg-1ubuntu1",
"2:5.2.3+dfsg-3",
"2:5.2.3+dfsg-3ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rails",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
"binary_name": "ruby-actioncable",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
"binary_name": "ruby-actionmailbox",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
"binary_name": "ruby-actionmailer",
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},
{
"binary_name": "ruby-actionpack",
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},
{
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},
{
"binary_name": "ruby-actionview",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
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},
{
"binary_name": "ruby-activemodel",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
"binary_name": "ruby-activerecord",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
"binary_name": "ruby-activestorage",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
"binary_name": "ruby-activesupport",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
"binary_name": "ruby-rails",
"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
},
{
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"binary_version": "2:6.1.4.1+dfsg-8ubuntu2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "rails",
"purl": "pkg:deb/ubuntu/rails@2:6.1.4.1+dfsg-8ubuntu2+esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:6.0.3.7+dfsg-2",
"2:6.1.4.1+dfsg-8ubuntu2",
"2:6.1.4.1+dfsg-8ubuntu2+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rails",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-actioncable",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-actionmailbox",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-actionmailer",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-actionpack",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-actiontext",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-actionview",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-activejob",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-activemodel",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-activerecord",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-activestorage",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-activesupport",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-rails",
"binary_version": "2:6.1.7.3+dfsg-3"
},
{
"binary_name": "ruby-railties",
"binary_version": "2:6.1.7.3+dfsg-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "rails",
"purl": "pkg:deb/ubuntu/rails@2:6.1.7.3+dfsg-3?arch=source\u0026distro=noble"
},
"ranges": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:6.1.7.3+dfsg-2build1",
"2:6.1.7.3+dfsg-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rails",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-actioncable",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-actionmailbox",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-actionmailer",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-actionpack",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-actiontext",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-actionview",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-activejob",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-activemodel",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-activerecord",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-activestorage",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-activesupport",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-rails",
"binary_version": "2:7.2.3.2+dfsg-2"
},
{
"binary_name": "ruby-railties",
"binary_version": "2:7.2.3.2+dfsg-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.10",
"name": "rails",
"purl": "pkg:deb/ubuntu/rails@2:7.2.3.2+dfsg-2?arch=source\u0026distro=stonking"
},
"ranges": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:7.2.3+dfsg-2",
"2:7.2.3.2+dfsg-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rails",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-actioncable",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-actionmailbox",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-actionmailer",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-actionpack",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-actiontext",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-actionview",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-activejob",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-activemodel",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-activerecord",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-activestorage",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-activesupport",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-rails",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-railties",
"binary_version": "2:7.2.3+dfsg-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "rails",
"purl": "pkg:deb/ubuntu/rails@2:7.2.3+dfsg-2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:7.2.2.1+dfsg-7",
"2:7.2.2.2+dfsg-2",
"2:7.2.3+dfsg-2"
]
}
],
"aliases": [],
"details": "Action Pack is a framework for handling and responding to web requests. From 8.1 until 8.1.4.1, Since Rails 8.1.0, ActionDispatch::RemoteIp derives request.remote_ip from Rack::Request#forwarded_for, which under Rack 3 reads the RFC 7239 Forwarded header in preference to X-Forwarded-For. When a reverse proxy appends the client address to X-Forwarded-For but passes a client-supplied Forwarded header through unchanged, request.remote_ip returns an address chosen by the client, and the IP spoofing check does not raise, because it compares only Client-Ip with the forwarded addresses. An unauthenticated attacker could therefore spoof request.remote_ip, possibly bypassing IP-based access controls and rate limits keyed on the client address (including the default by: of rate_limit), and falsifying the client address in logs. An application is affected if it meets all of these requirements: Runs Rails 8.1.0 through 8.1.4 with Rack 3. Under Rack 2.2, forwarded_for reads only X-Forwarded-For. Is served behind a proxy that does not remove or overwrite a client-supplied Forwarded header. Relies on request.remote_ip for access control, rate limiting, or auditing. The fix detects a spoofed Forwarded header only when the proxy also sets X-Forwarded-For. An application whose proxy passes a client-supplied Forwarded header through and sets no X-Forwarded-For remains exposed after upgrading, and should configure the proxy to remove or overwrite Forwarded, or apply the workaround below. This issue is fixed in version 8.1.4.1.",
"id": "UBUNTU-CVE-2026-126083",
"modified": "2026-11-12T00:00:00Z",
"published": "2026-11-12T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-126083"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-126083"
},
{
"type": "REPORT",
"url": "https://github.com/rails/rails/security/advisories/GHSA-2gff-2mmg-m73p"
},
{
"type": "REPORT",
"url": "https://github.com/rails/rails/commit/2a01a5ac521184419d9a92fa2c25e102e68cd227"
},
{
"type": "REPORT",
"url": "https://github.com/rails/rails/releases/tag/v8.1.4.1"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-126083"
]
}
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.