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CVE-2026-19630Amplified resource exhaustion in inbound message processing

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.

Timeline

  1. ID reserved

    By isc

  2. · 2 months later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-19630, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Awaiting Analysis3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.45% · top 61% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • ISC · BIND 9

    • affected 9.11.0 – ≤ 9.18.50
    • affected 9.20.0 – ≤ 9.20.29
    • affected 9.21.0 – ≤ 9.21.26
    • affected 9.11.3-S1 – ≤ 9.18.50-S1
    • affected 9.20.9-S1 – ≤ 9.20.29-S1

What to do

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.

Workaround: No workarounds known.

Exploitation: This flaw was discovered in internal testing. We are not aware of any active exploits.

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .