Vulnerability-Lookup

GHSA-C5M7-PPM5-WP5G

Vulnerability from github – Published: 2026-06-25 15:31 – Updated: 2026-06-25 15:31

Details

An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.

Severity

5.3 (Medium)


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

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  "affected": [],
  "aliases": [
    "CVE-2026-40209"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-772"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T13:16:39Z",
    "severity": "MODERATE"
  },
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  "id": "GHSA-c5m7-ppm5-wp5g",
  "modified": "2026-06-25T15:31:59Z",
  "published": "2026-06-25T15:31:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40209"
    },
    {
      "type": "WEB",
      "url": "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html"
    }
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      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-40209 (GCVE-0-2026-40209)

Vulnerability from cvelistv5 – Published: 2026-06-25 12:23 – Updated: 2026-06-25 13:56

Title

Denial of service via IXFR queries

Summary

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

Missing Release of Resource after Effective Lifetime
CWE-772 - Missing Release of Resource after Effective Lifetime

Assigner

References

1 reference

URL	Tags
https://www.dnsdist.org/security-advisories/power…

Impacted products

1 product

Vendor	Product	Version
PowerDNS	DNSdist	Affected: 1.9.0 , < 1.9.15 (semver) Affected: 2.0.0 , < 2.0.7 (semver)

Date Public

2026-06-24 22:00

Credits

Qifan Zhang (Palo Alto Networks)

Show details on NVD website

JSON

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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.

Action not permitted

GHSA-C5M7-PPM5-WP5G

CVE-2026-40209 (GCVE-0-2026-40209)

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Sightings

Nomenclature