CVE-2026-109140 (GCVE-0-2026-109140)

Vulnerability from cvelistv5 – Published: 2026-11-02 15:41 – Updated: 2026-11-02 16:12
VLAI
Title
Krill login-session tokens reuse their encryption nonce across restarts, so any user who can log in can forge an "admin" token
Summary
The vulnerability is that Krill encrypts every login-session token with a nonce built from a counter that is reset to 0 on every Krill restart, so the same (key, nonce) pair is used again after each restart.
Severity
8.4 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 16:12 UTC
CWE
  • CWE-323 - Reusing a Nonce, Key Pair in Encryption
Assigner
NLnet Labs CNA
CNA scorecard B 82/100 over 76 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
NLnet Labs Krill Unaffected: 0.16.1 , < * (semver)
guessed Create a notification for this product.
Date Public
2026-11-02 00:00
Credits
Anthropic and Ada Logics, Aymen Benlamari
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-109140",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-02T16:12:47.575702Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-02T16:12:58.713Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "Krill",
          "vendor": "NLnet Labs",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0.16.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Anthropic and Ada Logics, Aymen Benlamari"
        }
      ],
      "datePublic": "2026-11-02T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The vulnerability is that Krill encrypts every login-session token with a nonce built from a counter that is reset to 0 on every Krill restart, so the same (key, nonce) pair is used again after each restart."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-323",
              "description": "CWE-323 Reusing a Nonce, Key Pair in Encryption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-02T15:41:58.436Z",
        "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "shortName": "NLnet Labs"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109140.txt"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "This issue is fixed in 0.16.1 and all later versions."
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-10-03T00:00:00.000Z",
          "value": "Issue reported"
        },
        {
          "lang": "en",
          "time": "2026-11-02T00:00:00.000Z",
          "value": "Fixes released"
        }
      ],
      "title": "Krill login-session tokens reuse their encryption nonce across restarts, so any user who can log in can forge an \"admin\" token",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
    "assignerShortName": "NLnet Labs",
    "cveId": "CVE-2026-109140",
    "datePublished": "2026-11-02T15:41:58.436Z",
    "dateReserved": "2026-10-12T11:22:34.614Z",
    "dateUpdated": "2026-11-02T16:12:58.713Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-109140",
      "date": "2026-11-04",
      "epss": "0.00309",
      "percentile": "0.23895"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "affected",
                "product": "Krill",
                "vendor": "NLnet Labs",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "unaffected",
                    "version": "0.16.1",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "sep@nlnetlabs.nl"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The vulnerability is that Krill encrypts every login-session token with a nonce built from a counter that is reset to 0 on every Krill restart, so the same (key, nonce) pair is used again after each restart."
          }
        ],
        "id": "CVE-2026-109140",
        "lastModified": "2026-11-02T19:35:33.347",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 6.0,
              "source": "sep@nlnetlabs.nl",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-109140",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-02T16:12:47.575702Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-11-02T16:17:26.953",
        "references": [
          {
            "source": "sep@nlnetlabs.nl",
            "url": "https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109140.txt"
          }
        ],
        "sourceIdentifier": "sep@nlnetlabs.nl",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-323"
              }
            ],
            "source": "sep@nlnetlabs.nl",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-109140",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-02T16:12:47.575702Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-02T16:12:53.519Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "affected",
              "product": "Krill",
              "vendor": "NLnet Labs",
              "versions": [
                {
                  "lessThan": "*",
                  "status": "unaffected",
                  "version": "0.16.1",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Anthropic and Ada Logics, Aymen Benlamari"
            }
          ],
          "datePublic": "2026-11-02T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "The vulnerability is that Krill encrypts every login-session token with a nonce built from a counter that is reset to 0 on every Krill restart, so the same (key, nonce) pair is used again after each restart."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-323",
                  "description": "CWE-323 Reusing a Nonce, Key Pair in Encryption",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-11-02T15:41:58.436Z",
            "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
            "shortName": "NLnet Labs"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109140.txt"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "This issue is fixed in 0.16.1 and all later versions."
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-10-03T00:00:00.000Z",
              "value": "Issue reported"
            },
            {
              "lang": "en",
              "time": "2026-11-02T00:00:00.000Z",
              "value": "Fixes released"
            }
          ],
          "title": "Krill login-session tokens reuse their encryption nonce across restarts, so any user who can log in can forge an \"admin\" token",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "assignerShortName": "NLnet Labs",
        "cveId": "CVE-2026-109140",
        "datePublished": "2026-11-02T15:41:58.436Z",
        "dateReserved": "2026-10-12T11:22:34.614Z",
        "dateUpdated": "2026-11-02T16:12:58.713Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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

Loading timeline…




    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.