CVE-2026-9494 (GCVE-0-2026-9494)

Vulnerability from cvelistv5 – Published: 2026-07-16 12:12 – Updated: 2026-07-16 15:11
VLAI
Title
ubuntu-pro-client Information Disclosure via Cleartext Bearer Token Exposure in Process Command Line
Summary
An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT credentials by executing /usr/lib/apt/apt-helper using the download-file command. During this process, the secret bearer token is embedded directly in the cleartext URL component passed via the command-line arguments (argv), resulting in a URL format such as https://bearer:<token>@esm.ubuntu.com/.../. On systems utilizing a default-mounted /proc file system where process-hiding mitigations (such as hidepid) are disabled, an unprivileged local attacker can monitor system processes and read the sensitive bearer token directly from /proc/cmdline while the helper process is actively running. This leaked token can subsequently be used to gain unauthorized access to the victim's Ubuntu Pro or Expanded Security Maintenance (ESM) repositories.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-16 13:36 UTC
CWE
  • CWE-214 - Invocation of process using visible sensitive information
Assigner
canonical CNA under the mitre root
CNA scorecard B 82/100 over 60 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Canonical ubuntu-pro-client (ubuntu-advantage-tools) Affected: 0 , < 37.3 (python)
guessed Create a notification for this product.
Canonical Ubuntu 26.04 LTS Unaffected: 37.2ubuntu0.1 (dpkg)
guessed Create a notification for this product.
Canonical Ubuntu 24.04 LTS Unaffected: 37.2ubuntu~24.04.1 (dpkg)
guessed Create a notification for this product.
Canonical Ubuntu 22.04 LTS Unaffected: 37.2ubuntu~22.04.1 (dpkg)
guessed Create a notification for this product.
Canonical Ubuntu 20.04 LTS Unaffected: 37.1ubuntu0~20.04.1 (dpkg)
guessed Create a notification for this product.
Canonical Ubuntu 18.04 LTS Unaffected: 37.1ubuntu0~18.04.1 (dpkg)
guessed Create a notification for this product.
Canonical Ubuntu 16.04 LTS Unaffected: 37.1ubuntu0~16.04.1 (dpkg)
guessed Create a notification for this product.
Canonical Ubuntu 14.04 LTS Unaffected: 19.7ubuntu0.1 (dpkg)
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Date Public
2026-07-16 12:00
Credits
Show details on NVD website

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                  "version": "19.7ubuntu0.1",
                  "versionType": "dpkg"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Bilal Teke"
            }
          ],
          "datePublic": "2026-07-16T12:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "An information disclosure vulnerability exists in Canonical ubuntu-pro-client\u003cbr\u003e(formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT\u003cbr\u003ecredentials by executing /usr/lib/apt/apt-helper using the download-file\u003cbr\u003ecommand. During this process, the secret bearer token is embedded directly in\u003cbr\u003ethe cleartext URL component passed via the command-line arguments (argv),\u003cbr\u003eresulting in a URL format such as https://bearer:\u003ctoken\u003e@esm.ubuntu.com/.../.\u003cbr\u003eOn systems utilizing a default-mounted /proc file system where process-hiding\u003cbr\u003emitigations (such as hidepid) are disabled, an unprivileged local attacker can\u003cbr\u003emonitor system processes and read the sensitive bearer token directly from\u003cbr\u003e/proc/cmdline while the helper process is actively running. This leaked\u003cbr\u003etoken can subsequently be used to gain unauthorized access to the victim\u0027s\u003cbr\u003eUbuntu Pro or Expanded Security Maintenance (ESM) repositories.\u003cbr\u003e"
                }
              ],
              "value": "An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT credentials by executing /usr/lib/apt/apt-helper using the download-file command. During this process, the secret bearer token is embedded directly in\nthe cleartext URL component passed via the command-line arguments (argv), resulting in a URL format such as https://bearer:\u003ctoken\u003e@esm.ubuntu.com/.../. On systems utilizing a default-mounted /proc file system where process-hiding mitigations (such as hidepid) are disabled, an unprivileged local attacker can\nmonitor system processes and read the sensitive bearer token directly from /proc/cmdline while the helper process is actively running. This leaked token can subsequently be used to gain unauthorized access to the victim\u0027s Ubuntu Pro or Expanded Security Maintenance (ESM) repositories."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-13",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-13 Subverting Environment Variable Values"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-214",
                  "description": "CWE-214 Invocation of process using visible sensitive information",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-16T12:12:27.447Z",
            "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
            "shortName": "canonical"
          },
          "references": [
            {
              "tags": [
                "vdb-entry"
              ],
              "url": "https://ubuntu.com/security/CVE-2026-9494"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "ubuntu-pro-client Information Disclosure via Cleartext Bearer Token Exposure in Process Command Line"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
        "assignerShortName": "canonical",
        "cveId": "CVE-2026-9494",
        "datePublished": "2026-07-16T12:12:27.447Z",
        "dateReserved": "2026-05-25T08:23:24.573Z",
        "dateUpdated": "2026-07-16T15:11:07.229Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.