Vulnerability-Lookup

CVE-2026-41263 (GCVE-0-2026-41263)

Vulnerability from cvelistv5 – Published: 2026-04-30 20:39 – Updated: 2026-05-01 14:22

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

6.3 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-01 14:22 UTC

CWE

CWE-208 - Observable Timing Discrepancy

Assigner

GitHub_M mitre root

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

1 product

Vendor	Product	Version	CPE status
traefik	traefik	Affected: < 2.11.43 Affected: >= 3.0.0-beta1, < 3.6.14 Affected: >= 3.7.0-ea.1, < 3.7.0-rc.2	guessed

Show details on NVD website

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To clipboard

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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

Vendor	Product	Description
Traefik	Traefik	Traefik versions v3.7.0-rc.x antérieures à v3.7.0-rc.2
Traefik	Traefik	Traefik versions antérieures à v2.11.43
Traefik	Traefik	Traefik versions v3.6.x antérieures à v3.6.14

References

Title

Publication Time

CLEANSTART-2026-HD64585 (CVE-2026-41263)

Vulnerability from cleanstart – Published: 2026-09-18 09:51 – Updated: 2026-08-03 09:45 – Source website

Summary

Security fix for CVE-2026-41263 applied in: forecastle 1.0.159-r1

Details

Security vulnerability affects the forecastle package. This issue is resolved in later releases. See references for vulnerability details.

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-41263	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-41263	WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "forecastle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.159-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Security vulnerability affects the forecastle package. This issue is resolved in later releases. See references for vulnerability details.",
  "id": "CLEANSTART-2026-HD64585",
  "modified": "2026-08-03T09:45:51Z",
  "published": "2026-09-18T09:51:41.479157Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-HD64585.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-41263"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41263"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fix for CVE-2026-41263 applied in: forecastle 1.0.159-r1",
  "upstream": [
    "CVE-2026-41263"
  ]
}

CLEANSTART-2026-QI45196 (CVE-2026-40611)

Vulnerability from cleanstart – Published: 2026-08-13 12:10 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in forecastle 1.0.159-r1

Details

Package forecastle version 1.0.159-r1 fixes 43 vulnerabilities: CVE-2026-40611, CVE-2026-34986, CVE-2026-48020, CVE-2026-26999, CVE-2026-29054...

References

URL

Type

https://github.com/stakater/Forecastle

WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "forecastle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.159-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.159-r1"
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Package forecastle version 1.0.159-r1 fixes 43 vulnerabilities: CVE-2026-40611, CVE-2026-34986, CVE-2026-48020, CVE-2026-26999, CVE-2026-29054...",
  "id": "CLEANSTART-2026-QI45196",
  "modified": "2026-09-18T11:59:01.768079Z",
  "published": "2026-08-13T12:10:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/stakater/Forecastle"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes in forecastle 1.0.159-r1",
  "upstream": [
    "CVE-2026-40611",
    "CVE-2026-34986",
    "CVE-2026-48020",
    "CVE-2026-26999",
    "CVE-2026-29054",
    "CVE-2026-32305",
    "CVE-2026-35051",
    "CVE-2026-39858",
    "CVE-2026-40912",
    "ghsa-46wh-3698-f2cx",
    "ghsa-4hjq-9h5c-252j",
    "ghsa-gv8r-9rw9-9697",
    "CVE-2026-22045",
    "CVE-2026-26998",
    "CVE-2026-32595",
    "CVE-2026-33433",
    "CVE-2026-41174",
    "CVE-2026-41181",
    "CVE-2026-41263",
    "CVE-2026-44774",
    "CVE-2026-39828",
    "CVE-2026-39829",
    "CVE-2026-39830",
    "CVE-2026-39831",
    "CVE-2026-39832",
    "CVE-2026-39835",
    "CVE-2026-42508",
    "CVE-2026-46595",
    "CVE-2026-46597",
    "CVE-2026-39827",
    "CVE-2026-39833",
    "CVE-2026-39834",
    "CVE-2026-46598",
    "CVE-2026-25681",
    "CVE-2026-27136",
    "CVE-2026-33814",
    "CVE-2026-39821",
    "CVE-2026-25680",
    "CVE-2026-42502",
    "CVE-2026-42506",
    "CVE-2026-46600",
    "CVE-2026-39824",
    "CVE-2026-56852"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

FKIE_CVE-2026-41263

Vulnerability from fkie_nvd - Published: 2026-04-30 21:16 - Updated: 2026-06-17 10:46

Severity

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/traefik/traefik/releases/tag/v2.11.43	Product, Release Notes
security-advisories@github.com	https://github.com/traefik/traefik/releases/tag/v3.6.14	Product, Release Notes
security-advisories@github.com	https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2	Product, Release Notes
security-advisories@github.com	https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h	Patch, Vendor Advisory

Impacted products

Vendor	Product	Version
traefik	traefik	*
traefik	traefik	*
traefik	traefik	3.7.0
traefik	traefik	3.7.0
traefik	traefik	3.7.0
traefik	traefik	3.7.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "71119432-1348-4F69-A0E3-FA74592FA7EE",
              "versionEndExcluding": "2.11.43",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AA7AAE16-BBAD-434D-89F5-D52359D11D36",
              "versionEndExcluding": "3.6.14",
              "versionStartIncluding": "3.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*",
              "matchCriteriaId": "7881B288-5141-4508-AB71-3F7586168437",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:*",
              "matchCriteriaId": "AE5788A2-CCF9-4E87-8B94-133874F99CAE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:*",
              "matchCriteriaId": "B133B8F6-1C34-4354-9C1C-A5E063D27BC6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "976D40ED-187E-4C95-BB5A-126F06B8FAD9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "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."
    }
  ],
  "id": "CVE-2026-41263",
  "lastModified": "2026-06-17T10:46:24.157",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.7,
          "baseSeverity": "LOW",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-41263",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-01T14:22:30.689474Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-30T21:16:33.390",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-208"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-6X2Q-H3CR-8J2H

Vulnerability from github – Published: 2026-04-24 20:36 – Updated: 2026-05-06 21:24

Summary

Traefik: A timing side-channel vulnerability allows for valid username enumeration via BasicAuth middleware

Details

Summary

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.

Patches

https://github.com/traefik/traefik/releases/tag/v2.11.43
https://github.com/traefik/traefik/releases/tag/v3.6.14
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2

For more information

If there are any questions or comments about this advisory, please open an issue.

Original Description # BasicAuth Timing Regression: CVE-2026-32595 Fix Is a No-Op Due to Map Key/Value Confusion ## TL;DR The patch for CVE-2026-32595 is a no-op. Line 49 of `basic_auth.go` has a map key/value confusion that makes `notFoundSecret` always `""`. The "constant time" fallback calls `goauth.CheckSecret(password, "")`, which fast-fails in ~1us instead of running bcrypt (~60ms). ## Evidence (HEAD `786f7192e`, 2026-04-09) Black-box PoC against live traefik binary on port 28080: | bucket | n | median | min | |------------------------------|-----|----------|----------| | existing user (wrong pw) | 240 | 62.85 ms | 57.54 ms | | nonexistent user (wrong pw) | 400 | 0.48 ms | 0.35 ms | Median ratio: **130.4x**. Classification: **8/8 correct**. Go in-tree test: `goauth.CheckSecret` direct ratio **12,746x**. ## Root cause (4-step trace) 1. `basic_auth.go:49`: `users[slices.Collect(maps.Values(users))[0]]` -- looks up a hash as a username key, returns `""`. 2. `basic_auth.go:119-120`: calls `goauth.CheckSecret(password, "")`. 3. `go-http-auth/basic.go:87`: empty string matches no prefix, falls to default `compareMD5HashAndPassword`. 4. `basic.go:107-109`: `bytes.SplitN("", "$", 4)` returns length 1, function returns instantly. ## Files - `poc/exploit.py` -- black-box Python timing oracle - `poc/basic_auth_timing_regression_test.go` -- Go in-tree test - `poc/traefik.yml` + `poc/dynamic.yml` -- traefik config - `poc/live_http_poc_output_head.txt` -- verbatim PoC output on HEAD Koda Reef

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

6.3 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.7.0-ea.1"
            },
            {
              "fixed": "3.7.0-rc.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0-beta1"
            },
            {
              "fixed": "3.6.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.43"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/traefik/traefik"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.7.34"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41263"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-208"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-24T20:36:41Z",
    "nvd_published_at": "2026-04-30T21:16:33Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThere is a timing side-channel vulnerability in Traefik\u0027s BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences.\n\nThe 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.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.43\n- https://github.com/traefik/traefik/releases/tag/v3.6.14\n- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2\n\n## For more information\n\nIf there are any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n\u003cdetails\u003e\n\u003csummary\u003eOriginal Description\u003c/summary\u003e\n\n# BasicAuth Timing Regression: CVE-2026-32595 Fix Is a No-Op Due to Map Key/Value Confusion\n\n## TL;DR\n\nThe patch for CVE-2026-32595 is a no-op. Line 49 of `basic_auth.go` has a\nmap key/value confusion that makes `notFoundSecret` always `\"\"`. The\n\"constant time\" fallback calls `goauth.CheckSecret(password, \"\")`, which\nfast-fails in ~1us instead of running bcrypt (~60ms).\n\n## Evidence (HEAD `786f7192e`, 2026-04-09)\n\nBlack-box PoC against live traefik binary on port 28080:\n\n| bucket                       | n   | median   | min      |\n|------------------------------|-----|----------|----------|\n| existing user (wrong pw)     | 240 | 62.85 ms | 57.54 ms |\n| nonexistent user (wrong pw)  | 400 |  0.48 ms |  0.35 ms |\n\nMedian ratio: **130.4x**. Classification: **8/8 correct**.\n\nGo in-tree test: `goauth.CheckSecret` direct ratio **12,746x**.\n\n## Root cause (4-step trace)\n\n1. `basic_auth.go:49`: `users[slices.Collect(maps.Values(users))[0]]` -- looks\n   up a hash as a username key, returns `\"\"`.\n2. `basic_auth.go:119-120`: calls `goauth.CheckSecret(password, \"\")`.\n3. `go-http-auth/basic.go:87`: empty string matches no prefix, falls to default\n   `compareMD5HashAndPassword`.\n4. `basic.go:107-109`: `bytes.SplitN(\"\", \"$\", 4)` returns length 1, function\n   returns instantly.\n\n## Files\n\n- `poc/exploit.py` -- black-box Python timing oracle\n- `poc/basic_auth_timing_regression_test.go` -- Go in-tree test\n- `poc/traefik.yml` + `poc/dynamic.yml` -- traefik config\n- `poc/live_http_poc_output_head.txt` -- verbatim PoC output on HEAD\n\n\nKoda Reef\n\n\u003c/details\u003e\n\n---",
  "id": "GHSA-6x2q-h3cr-8j2h",
  "modified": "2026-05-06T21:24:51Z",
  "published": "2026-04-24T20:36:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41263"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/traefik/traefik"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Traefik: A timing side-channel vulnerability allows for valid username enumeration via BasicAuth middleware"
}

OPENSUSE-SU-2026:10697-1

Vulnerability from csaf_opensuse - Published: 2026-05-05 00:00 - Updated: 2026-09-17 17:03

Summary

traefik-3.6.15-1.1 on GA media

Severity

Moderate

Scope

6 vulnerabilities in this advisory, including CVE-2026-41263.

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

Recommended: 4 products

Open the full advisory

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

Scope

6 vulnerabilities in this advisory, including CVE-2026-41263.

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

Recommended: 4 products

Open the full advisory

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2026-41263 (GCVE-0-2026-41263)

CERTFR-2026-AVI-0490

Solutions

CLEANSTART-2026-HD64585 (CVE-2026-41263)

CLEANSTART-2026-QI45196 (CVE-2026-40611)

FKIE_CVE-2026-41263

GHSA-6X2Q-H3CR-8J2H

Summary

Patches

For more information

OPENSUSE-SU-2026:10697-1

OPENSUSE-SU-2026:10698-1

Tags

Sightings

Nomenclature

Related by attack behaviour