OPENSUSE-SU-2026:10698-1

Vulnerability from csaf_opensuse - Published: 2026-05-05 00:00 - Updated: 2026-09-17 17:03
Summary
traefik2-2.11.44-1.1 on GA media
Severity
Moderate
Notes
Title of the patch: traefik2-2.11.44-1.1 on GA media
Description of the patch: These are all security issues fixed in the traefik2-2.11.44-1.1 package on the GA media of openSUSE Tumbleweed.
Patchnames: openSUSE-Tumbleweed-2026-10698
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-34986
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64 —
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le —
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x —
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64 —
Vendor Fix
Threats
Impact important
CVE-2026-35051
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-34986
Threats
Impact critical
CVE-2026-39858
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-34986
Threats
Impact critical
CVE-2026-40912
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-34986
Threats
Impact important
CVE-2026-41174
6.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-34986
Threats
Impact moderate
CVE-2026-41263
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-34986
Threats
Impact moderate
References
To clipboard 

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          "text": "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 ForwardAuth and snippet-based authentication middleware. Traefik\u0027s 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.",
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          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-40912",
          "url": "https://www.suse.com/security/cve/CVE-2026-40912"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263868 for CVE-2026-40912",
          "url": "https://bugzilla.suse.com/1263868"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-40912"
    },
    {
      "cve": "CVE-2026-41174",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-41174"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-41174",
          "url": "https://www.suse.com/security/cve/CVE-2026-41174"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263869 for CVE-2026-41174",
          "url": "https://bugzilla.suse.com/1263869"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T00:00:00Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-41174"
    },
    {
      "cve": "CVE-2026-41263",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-41263"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
          "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-41263",
          "url": "https://www.suse.com/security/cve/CVE-2026-41263"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263870 for CVE-2026-41263",
          "url": "https://bugzilla.suse.com/1263870"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.aarch64",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.ppc64le",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.s390x",
            "openSUSE Tumbleweed:traefik2-0:2.11.44-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T00:00:00Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-41263"
    }
  ]
}



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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.
  • 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.



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.