CVE-2026-12725 (GCVE-0-2026-12725)

Vulnerability from cvelistv5 – Published: 2026-06-22 13:55 – Updated: 2026-08-31 21:22
VLAI
Title
Dnsmasq: dnsmasq: heap buffer overflow in log_query() when logging unsupported ds/dnskey replies
Summary
A heap-based buffer overflow was found in dnsmasq. When DNSSEC validation and query logging are both enabled, logging of DS or DNSKEY replies containing unsupported algorithm or digest types can cause dnsmasq to write past the end of an internal logging buffer. A remote attacker able to supply such a DNS response may crash the dnsmasq process, resulting in denial of service.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-22 18:20 UTC
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-12725 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2490763 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-04-21 21:14
Credits
Red Hat would like to thank Yiwei Hou (UC Berkeley) for reporting this issue.
Show details on NVD website
To clipboard 

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            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-06-19T14:38:57.965Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-04-21T21:14:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Dnsmasq: dnsmasq: heap buffer overflow in log_query() when logging unsupported ds/dnskey replies",
          "workarounds": [
            {
              "lang": "en",
              "value": "Mitigate this issue by updating to a version of dnsmasq that includes the\nupstream fix (commit 36d081e37477027fd721fea498f3760f529034ad), or by\ndisabling query logging if DNSSEC validation must remain enabled. After\nchanging the configuration, restart the dnsmasq service for the changes to\ntake effect."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-122: Heap-based Buffer Overflow"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-12725",
        "datePublished": "2026-06-22T13:55:05.406Z",
        "dateReserved": "2026-06-19T14:44:05.921Z",
        "dateUpdated": "2026-08-31T21:22:15.716Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.