---
id: CVE-2026-77692
title: >-
  An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS
  request with a cryptographically invalid SIG(0) record, and then closing the
  transport connection prematurely.

  This issue affects BIND 9 versions 9.20.0 through 9…
summary: >-
  An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS
  request with a cryptographically invalid SIG(0) record, and then closing the
  transport connection prematurely.

  This issue affects BIND 9 versions 9.20.0 through 9…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
  - CWE-617
vendor: ISC
product: BIND 9
affected:
  - bind_9 >= 9.20.0 <= 9.20.27
  - bind_9 >= 9.21.0 <= 9.21.25
  - bind_9 >= 9.20.9-S1 <= 9.20.27-S1
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T19:16:59.633'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77692'
references:
  - url: 'https://downloads.isc.org/isc/bind9/9.20.29'
    label: security-officer@isc.org
  - url: 'https://downloads.isc.org/isc/bind9/9.21.26'
    label: security-officer@isc.org
  - url: 'https://kb.isc.org/docs/cve-2026-77692'
    label: security-officer@isc.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77692.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-77692'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2535462'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-77692'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77692'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68279'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-17T18:43:28.126517Z'
ingestedAt: '2026-09-16T14:57:28.017Z'
epss: 0.0048
epssPercentile: 0.40431
patched:
  - hardened_images
---

## Overview

An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS request with a cryptographically invalid SIG(0) record, and then closing the transport connection prematurely.
This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77692.json)
- **RHSA-2026:68279** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68279)