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CVE-2026-77119 (GCVE-0-2026-77119)

Vulnerability from cvelistv5 – Published: 2026-09-16 14:17 – Updated: 2026-09-16 14:17
VLAI
Title
NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets
Summary
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-346 - Origin Validation Error
Assigner
References
Impacted products
Vendor Product Version CPE status
ISC BIND 9 Affected: 9.11.0 , ≤ 9.18.50 (custom)
Affected: 9.20.0 , ≤ 9.20.27 (custom)
Affected: 9.21.0 , ≤ 9.21.25 (custom)
Affected: 9.11.3-S1 , ≤ 9.18.50-S1 (custom)
Affected: 9.20.9-S1 , ≤ 9.20.27-S1 (custom)
    cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
    cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
    cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
    cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
    cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-16 00:00
Show details on NVD website
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      ],
      "exploits": [
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          "value": "This flaw was discovered in internal testing. We are not aware of any active exploits."
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      "impacts": [
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          "descriptions": [
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              "lang": "en",
              "value": "An attacker may be able to provide false delegations to an unsigned zone enabling a cache poisoning attack."
            }
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            "attackVector": "NETWORK",
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            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
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          "descriptions": [
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              "description": "CWE-346 Origin Validation Error",
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        "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "shortName": "isc"
      },
      "references": [
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          "name": "CVE-2026-77119",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://kb.isc.org/docs/cve-2026-77119"
        },
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          "tags": [
            "patch"
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          "url": "https://downloads.isc.org/isc/bind9/9.20.29"
        },
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          "tags": [
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          "url": "https://downloads.isc.org/isc/bind9/9.21.26"
        }
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      "solutions": [
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          "lang": "en",
          "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.29, 9.21.26, or 9.20.29-S1."
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets",
      "workarounds": [
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          "lang": "en",
          "value": "No workarounds known."
        }
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    "datePublished": "2026-09-16T14:17:11.956Z",
    "dateReserved": "2026-08-20T12:48:33.514Z",
    "dateUpdated": "2026-09-16T14:17:11.956Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
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      "cve": "CVE-2026-77119",
      "id": "CVE-2026-77119",
      "initial_release_date": "2026-09-16T14:17:11.956000+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "12",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77119.json",
      "version": "3"
    }
  }
}



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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

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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.


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