Vulnerability-Lookup

GHSA-GX3X-VQ4P-MHHV

Vulnerability from github – Published: 2026-02-02 22:11 – Updated: 2026-02-05 00:34

Summary

cert-manager-controller DoS via Specially Crafted DNS Response

Details

Impact

The cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS.

An attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager's DNS cache. Accessing this entry will trigger a panic, resulting in Denial of Service (DoS) of the cert-manager controller.

The issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor.

Patches

The vulnerability was introduced in cert-manager v1.18.0 and has been patched in cert-manager v1.19.3 and v1.18.5, which are the supported minor releases at the time of publishing.

cert-manager versions prior to v1.18.0 are unaffected.

Workarounds

Using DNS-over-HTTPS reduces the risk of DNS traffic being intercepted and modified.
- Note that DNS-over-HTTPS does not prevent the risk of an attacker-controlled authoritative DNS server.

Resources

Fix for cert-manager 1.18: https://github.com/cert-manager/cert-manager/pull/8467
Fix for cert-manager 1.19: https://github.com/cert-manager/cert-manager/pull/8468
Fix for master branch: https://github.com/cert-manager/cert-manager/pull/8469

Credits

Huge thanks to Oleh Konko (@1seal) for reporting the issue, providing a detailed PoC and an initial patch!

Severity ?

5.9 (Medium)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/cert-manager/cert-manager"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.18.0"
            },
            {
              "fixed": "1.18.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/cert-manager/cert-manager"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.19.0"
            },
            {
              "fixed": "1.19.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25518"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-129",
      "CWE-704"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-02T22:11:06Z",
    "nvd_published_at": "2026-02-04T22:15:58Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nThe cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS.\n\nAn attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager\u0027s DNS cache. Accessing this entry will trigger a panic, resulting in Denial of Service (DoS) of the cert-manager controller.\n\nThe issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor.\n\n### Patches\n\nThe vulnerability was introduced in cert-manager v1.18.0 and has been patched in cert-manager v1.19.3 and v1.18.5, which are the supported minor releases at the time of publishing.\n\ncert-manager versions prior to v1.18.0 are unaffected.\n\n### Workarounds\n\n- Using DNS-over-HTTPS reduces the risk of DNS traffic being intercepted and modified.\n    - Note that DNS-over-HTTPS does *not* prevent the risk of an attacker-controlled authoritative DNS server.\n\n### Resources\n\n- Fix for cert-manager 1.18: https://github.com/cert-manager/cert-manager/pull/8467\n- Fix for cert-manager 1.19: https://github.com/cert-manager/cert-manager/pull/8468\n- Fix for master branch: https://github.com/cert-manager/cert-manager/pull/8469\n\n### Credits\n\nHuge thanks to Oleh Konko (@1seal) for reporting the issue, providing a detailed PoC and an initial patch!",
  "id": "GHSA-gx3x-vq4p-mhhv",
  "modified": "2026-02-05T00:34:16Z",
  "published": "2026-02-02T22:11:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cert-manager/cert-manager/security/advisories/GHSA-gx3x-vq4p-mhhv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25518"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cert-manager/cert-manager/pull/8467"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cert-manager/cert-manager/pull/8468"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cert-manager/cert-manager/pull/8469"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cert-manager/cert-manager/commit/409fc24e539711a07aae45ed45abbe03dfdad2cc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cert-manager/cert-manager/commit/9a73a0b3853035827edd37ac463e4803ba10327d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cert-manager/cert-manager/commit/d4faed26ae12115cceb807cdc12507ebc28980e2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cert-manager/cert-manager"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "cert-manager-controller DoS via Specially Crafted DNS Response"
}

cleanstart-2026-jn44153

Vulnerability from cleanstart

Published

2026-02-06 00:39

Modified

2026-02-05 12:20

Summary

Security fixes for GHSA-f6x5-jh6r-wrfv, GHSA-gx3x-vq4p-mhhv, GHSA-j5w8-q4qc-rx2x applied in versions: 1.18.0-r0, 1.19.0-r1

Details

Multiple security vulnerabilities affect the percona-xtradb-cluster-operator-fips package. These issues are resolved in later releases. See references for individual vulnerability details.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "percona-xtradb-cluster-operator-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.0-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Multiple security vulnerabilities affect the percona-xtradb-cluster-operator-fips package. These issues are resolved in later releases. See references for individual vulnerability details.",
  "id": "CLEANSTART-2026-JN44153",
  "modified": "2026-02-05T12:20:16Z",
  "published": "2026-02-06T00:39:29.662228Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-JN44153.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/GHSA-f6x5-jh6r-wrfv"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/GHSA-gx3x-vq4p-mhhv"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/GHSA-j5w8-q4qc-rx2x"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes for GHSA-f6x5-jh6r-wrfv, GHSA-gx3x-vq4p-mhhv, GHSA-j5w8-q4qc-rx2x applied in versions: 1.18.0-r0, 1.19.0-r1",
  "upstream": [
    "GHSA-f6x5-jh6r-wrfv",
    "GHSA-gx3x-vq4p-mhhv",
    "GHSA-j5w8-q4qc-rx2x"
  ]
}

CVE-2026-25518 (GCVE-0-2026-25518)

Vulnerability from cvelistv5 – Published: 2026-02-04 21:18 – Updated: 2026-02-05 14:31

Title

cert-manager-controller DoS via Specially Crafted DNS Response

Summary

cert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. In versions from 1.18.0 to before 1.18.5 and from 1.19.0 to before 1.19.3, the cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS. An attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager's DNS cache. Accessing this entry will trigger a panic, resulting in denial‑of‑service (DoS) of the cert-manager controller. The issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor. This issue has been patched in versions 1.18.5 and 1.19.3.

Severity ?

5.9 (Medium)


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

CWE

CWE-129 - Improper Validation of Array Index
CWE-704 - Incorrect Type Conversion or Cast

Assigner

GitHub_M

References

URL

Tags

	https://github.com/cert-manager/cert-manager/secu…	x_refsource_CONFIRM
	https://github.com/cert-manager/cert-manager/pull/8467	x_refsource_MISC
	https://github.com/cert-manager/cert-manager/pull/8468	x_refsource_MISC
	https://github.com/cert-manager/cert-manager/pull/8469	x_refsource_MISC
	https://github.com/cert-manager/cert-manager/comm…	x_refsource_MISC
	https://github.com/cert-manager/cert-manager/comm…	x_refsource_MISC
	https://github.com/cert-manager/cert-manager/comm…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	cert-manager	cert-manager	Affected: >= 1.18.0, < 1.18.5 Affected: >= 1.19.0, < 1.19.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-25518",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-05T14:20:07.711479Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-05T14:31:52.478Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "cert-manager",
          "vendor": "cert-manager",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.18.0, \u003c 1.18.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.19.0, \u003c 1.19.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "cert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. In versions from 1.18.0 to before 1.18.5 and from 1.19.0 to before 1.19.3, the cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS. An attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager\u0027s DNS cache. Accessing this entry will trigger a panic, resulting in denial\u2011of\u2011service (DoS) of the cert-manager controller. The issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor. This issue has been patched in versions 1.18.5 and 1.19.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-129",
              "description": "CWE-129: Improper Validation of Array Index",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-704",
              "description": "CWE-704: Incorrect Type Conversion or Cast",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-04T21:18:06.681Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/cert-manager/cert-manager/security/advisories/GHSA-gx3x-vq4p-mhhv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/cert-manager/cert-manager/security/advisories/GHSA-gx3x-vq4p-mhhv"
        },
        {
          "name": "https://github.com/cert-manager/cert-manager/pull/8467",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cert-manager/cert-manager/pull/8467"
        },
        {
          "name": "https://github.com/cert-manager/cert-manager/pull/8468",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cert-manager/cert-manager/pull/8468"
        },
        {
          "name": "https://github.com/cert-manager/cert-manager/pull/8469",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cert-manager/cert-manager/pull/8469"
        },
        {
          "name": "https://github.com/cert-manager/cert-manager/commit/409fc24e539711a07aae45ed45abbe03dfdad2cc",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cert-manager/cert-manager/commit/409fc24e539711a07aae45ed45abbe03dfdad2cc"
        },
        {
          "name": "https://github.com/cert-manager/cert-manager/commit/9a73a0b3853035827edd37ac463e4803ba10327d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cert-manager/cert-manager/commit/9a73a0b3853035827edd37ac463e4803ba10327d"
        },
        {
          "name": "https://github.com/cert-manager/cert-manager/commit/d4faed26ae12115cceb807cdc12507ebc28980e2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cert-manager/cert-manager/commit/d4faed26ae12115cceb807cdc12507ebc28980e2"
        }
      ],
      "source": {
        "advisory": "GHSA-gx3x-vq4p-mhhv",
        "discovery": "UNKNOWN"
      },
      "title": "cert-manager-controller DoS via Specially Crafted DNS Response"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-25518",
    "datePublished": "2026-02-04T21:18:06.681Z",
    "dateReserved": "2026-02-02T18:21:42.487Z",
    "dateUpdated": "2026-02-05T14:31:52.478Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-GX3X-VQ4P-MHHV

Impact

Patches

Workarounds

Resources

Credits

cleanstart-2026-jn44153

Vulnerability from cleanstart

CVE-2026-25518 (GCVE-0-2026-25518)

Tags

Sightings

Nomenclature