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Back to active CVEs
High · CVSS 7.5CVE-2026-19630

Amplified resource exhaustion in inbound message processingCVE-2026-19630

Answer in brief

CVE-2026-19630 records a High severity (CVSS 7.5) vulnerability in Amplified resource exhaustion in inbound message processing. The current sources do not mark it as known exploited. The current feed maps ISC/BIND 9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 21, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Oct 21, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ISC/BIND 9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ISC/BIND 9generic>=9.11.0 <=9.18.50 || >=9.20.0 <=9.20.29 || >=9.21.0 <=9.21.26 || >=9.11.3-S1 <=9.18.50-S1 || >=9.20.9-S1 <=9.20.29-S1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ISC/BIND 9.
  2. 2Review the reported fix. Source-reported solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.30, 9.21.27, or 9.20.30-S1.

Evidence timeline and material changes

  1. Published upstream

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 21, 2026

Sources and claim methodology

  • Source referencedownloads.isc.org
  • Source referencedownloads.isc.org
  • Source referencekb.isc.org
Upstream source description

In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND. A DNS message with a maliciously large number of such structures will cause BIND to consume disproportionate amounts of CPU time and memory during processing. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Concurrent GSS-TSIG messages corrupt memorySame isc/bind 9 package
  • Named may terminate unexpectedly when a redirect zone is used with strict QNAME minimizationSame isc/bind 9 package
  • Specific RPZ configurations and query patterns may result in an unexpected exitSame isc/bind 9 package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-407
Source
CVE List V5
Source checked
Oct 21, 2026
References
3 linked sources
Open source record