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CERTFR-2026-AVI-0490
Vulnerability from certfr_avis - Published: 2026-04-24 - Updated: 2026-04-24
De multiples vulnérabilités ont été découvertes dans Traefik. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données et un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Traefik versions v3.7.0-rc.x ant\u00e9rieures \u00e0 v3.7.0-rc.2",
"product": {
"name": "Traefik",
"vendor": {
"name": "Traefik",
"scada": false
}
}
},
{
"description": "Traefik versions ant\u00e9rieures \u00e0 v2.11.43",
"product": {
"name": "Traefik",
"vendor": {
"name": "Traefik",
"scada": false
}
}
},
{
"description": "Traefik versions v3.6.x ant\u00e9rieures \u00e0 v3.6.14",
"product": {
"name": "Traefik",
"vendor": {
"name": "Traefik",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-39858",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-39858"
},
{
"name": "CVE-2026-35051",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-35051"
},
{
"name": "CVE-2026-41174",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-41174"
},
{
"name": "CVE-2026-41263",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-41263"
},
{
"name": "CVE-2026-40912",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-40912"
}
],
"initial_release_date": "2026-04-24T00:00:00",
"last_revision_date": "2026-04-24T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0490",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-04-24T00:00:00.000000"
}
],
"risks": [
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Traefik. Elles permettent \u00e0 un attaquant de provoquer une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es et un contournement de la politique de s\u00e9curit\u00e9.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Traefik",
"vendor_advisories": [
{
"published_at": "2026-04-24",
"title": "Bulletin de s\u00e9curit\u00e9 Traefik GHSA-6jwx-7vp4-9847",
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-6jwx-7vp4-9847"
},
{
"published_at": "2026-04-24",
"title": "Bulletin de s\u00e9curit\u00e9 Traefik GHSA-6x2q-h3cr-8j2h",
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h"
},
{
"published_at": "2026-04-24",
"title": "Bulletin de s\u00e9curit\u00e9 Traefik GHSA-5m6w-wvh7-57vm",
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm"
},
{
"published_at": "2026-04-24",
"title": "Bulletin de s\u00e9curit\u00e9 Traefik GHSA-xhjw-95fp-8vgq",
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq"
},
{
"published_at": "2026-04-24",
"title": "Bulletin de s\u00e9curit\u00e9 Traefik GHSA-6384-m2mw-rf54",
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54"
}
]
}
CVE-2026-35051 (GCVE-0-2026-35051)
Vulnerability from cvelistv5 – Published: 2026-04-30 20:26 – Updated: 2026-05-01 21:20
VLAI
EPSS
Title
Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v3.6.14 | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-35051",
"options": [
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"timestamp": "2026-05-01T21:19:58.832533Z",
"version": "2.0.3"
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},
"title": "CISA ADP Vulnrichment"
}
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"vendor": "traefik",
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{
"status": "affected",
"version": "\u003c 2.11.43"
},
{
"status": "affected",
"version": "\u003e= 3.0.0-beta1, \u003c 3.6.14"
},
{
"status": "affected",
"version": "\u003e= 3.7.0-ea.1, \u003c 3.7.0-rc.2"
}
]
}
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"lang": "en",
"value": "Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik\u0027s ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-345",
"description": "CWE-345: Insufficient Verification of Data Authenticity",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-30T20:26:06.716Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.11.43",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
}
],
"source": {
"advisory": "GHSA-6384-m2mw-rf54",
"discovery": "UNKNOWN"
},
"title": "Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-35051",
"datePublished": "2026-04-30T20:26:06.716Z",
"dateReserved": "2026-03-31T21:06:06.429Z",
"dateUpdated": "2026-05-01T21:20:11.714Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39858 (GCVE-0-2026-39858)
Vulnerability from cvelistv5 – Published: 2026-04-30 20:26 – Updated: 2026-05-04 16:58
VLAI
EPSS
Title
Traefik: Forwarded alias spoofing top pre-auth decision bypass
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based authentication middleware. Traefik's forwarded-header sanitization logic targets only canonical header names (e.g., X-Forwarded-Proto) and does not strip or normalize alias variants that use underscores instead of dashes (e.g., X_Forwarded_Proto). These unsanitized alias headers are forwarded intact to the authentication backend. When the backend normalizes underscore and dash header forms equivalently, an attacker can inject spoofed trust context — such as a trusted scheme or host — through the alias headers and bypass authentication on protected routes without valid credentials. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v3.6.14 | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-39858",
"options": [
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},
{
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},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-04T16:57:57.062955Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-04T16:58:14.458Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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{
"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.43"
},
{
"status": "affected",
"version": "\u003e= 3.0.0-beta1, \u003c 3.6.14"
},
{
"status": "affected",
"version": "\u003e= 3.7.0-ea.1, \u003c 3.7.0-rc.2"
}
]
}
],
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}
],
"metrics": [
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"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
"version": "4.0",
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"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
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}
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"problemTypes": [
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"descriptions": [
{
"cweId": "CWE-290",
"description": "CWE-290: Authentication Bypass by Spoofing",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-306",
"description": "CWE-306: Missing Authentication for Critical Function",
"lang": "en",
"type": "CWE"
}
]
}
],
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"name": "https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm",
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"x_refsource_CONFIRM"
],
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.11.43",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
}
],
"source": {
"advisory": "GHSA-5m6w-wvh7-57vm",
"discovery": "UNKNOWN"
},
"title": "Traefik: Forwarded alias spoofing top pre-auth decision bypass"
}
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CVE-2026-40912 (GCVE-0-2026-40912)
Vulnerability from cvelistv5 – Published: 2026-04-30 20:38 – Updated: 2026-05-01 14:54
VLAI
EPSS
Title
Traefik: StripPrefixRegex auth bypass via Path/RawPath desync
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the percent-encoded raw path. When a dot (or multiple dots) appears in the prefix portion of the URL, the raw path after stripping becomes a dot-segment (e.g. /./admin/secret). ForwardAuth receives this dot-segment path in X-Forwarded-Uri, which does not match the protected path patterns and therefore allows the request through. The backend then normalizes the dot-segment to the real path per RFC 3986 and serves the protected content An unauthenticated attacker can exploit this against any backend that performs dot-segment normalization. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-706 - Use of Incorrectly-Resolved Name or Reference
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v3.6.14 | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-40912",
"options": [
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},
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}
],
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"timestamp": "2026-05-01T14:53:15.470528Z",
"version": "2.0.3"
},
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.43"
},
{
"status": "affected",
"version": "\u003e= 3.0.0-beta1, \u003c 3.6.14"
},
{
"status": "affected",
"version": "\u003e= 3.7.0-ea.1, \u003c 3.7.0-rc.2"
}
]
}
],
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{
"lang": "en",
"value": "Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik\u0027s StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the percent-encoded raw path. When a dot (or multiple dots) appears in the prefix portion of the URL, the raw path after stripping becomes a dot-segment (e.g. /./admin/secret). ForwardAuth receives this dot-segment path in X-Forwarded-Uri, which does not match the protected path patterns and therefore allows the request through. The backend then normalizes the dot-segment to the real path per RFC 3986 and serves the protected content An unauthenticated attacker can exploit this against any backend that performs dot-segment normalization. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2."
}
],
"metrics": [
{
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"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-706",
"description": "CWE-706: Use of Incorrectly-Resolved Name or Reference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-30T20:38:21.969Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/traefik/traefik/security/advisories/GHSA-6jwx-7vp4-9847",
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"x_refsource_CONFIRM"
],
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},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.11.43",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
}
],
"source": {
"advisory": "GHSA-6jwx-7vp4-9847",
"discovery": "UNKNOWN"
},
"title": "Traefik: StripPrefixRegex auth bypass via Path/RawPath desync"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-40912",
"datePublished": "2026-04-30T20:38:21.969Z",
"dateReserved": "2026-04-15T16:37:22.768Z",
"dateUpdated": "2026-05-01T14:54:06.078Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41174 (GCVE-0-2026-41174)
Vulnerability from cvelistv5 – Published: 2026-04-30 20:20 – Updated: 2026-05-04 13:26
VLAI
EPSS
Title
Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/traefik/commit/df00d82… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v3.6.14 | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
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"content": {
"id": "CVE-2026-41174",
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{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-04T13:25:25.541487Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-04T13:26:08.289Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.43"
},
{
"status": "affected",
"version": "\u003e= 3.7.0-ea.1, \u003c 3.7.0-rc.2"
}
]
}
],
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{
"lang": "en",
"value": "Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik\u0027s Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware\u0027s spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-863",
"description": "CWE-863: Incorrect Authorization",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-653",
"description": "CWE-653: Improper Isolation or Compartmentalization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-30T20:20:29.679Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq"
},
{
"name": "https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.11.43",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
}
],
"source": {
"advisory": "GHSA-xhjw-95fp-8vgq",
"discovery": "UNKNOWN"
},
"title": "Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding"
}
},
"cveMetadata": {
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"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41174",
"datePublished": "2026-04-30T20:20:29.679Z",
"dateReserved": "2026-04-17T16:34:45.526Z",
"dateUpdated": "2026-05-04T13:26:08.289Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-41263 (GCVE-0-2026-41263)
Vulnerability from cvelistv5 – Published: 2026-04-30 20:39 – Updated: 2026-05-01 14:22
VLAI
EPSS
Title
Traefik: BasicAuth middleware: timing side-channel vulnerability
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v3.6.14 | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41263",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-01T14:22:30.689474Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-01T14:22:40.566Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.43"
},
{
"status": "affected",
"version": "\u003e= 3.0.0-beta1, \u003c 3.6.14"
},
{
"status": "affected",
"version": "\u003e= 3.7.0-ea.1, \u003c 3.7.0-rc.2"
}
]
}
],
"descriptions": [
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"lang": "en",
"value": "Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik\u0027s BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208: Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-30T20:39:49.658Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.11.43",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
}
],
"source": {
"advisory": "GHSA-6x2q-h3cr-8j2h",
"discovery": "UNKNOWN"
},
"title": "Traefik: BasicAuth middleware: timing side-channel vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41263",
"datePublished": "2026-04-30T20:39:49.658Z",
"dateReserved": "2026-04-18T14:01:46.801Z",
"dateUpdated": "2026-05-01T14:22:40.566Z",
"state": "PUBLISHED"
},
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}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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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