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CVE-2026-3592Amplification vulnerabilities via self-pointed glue records

Description

BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Timeline

  1. ID reserved

    By isc

  2. · 3 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-2026-3592, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Analyzed3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS (exploitation in 30 days)
0.41% · top 65% of all CVEs (13 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: Medium 5.3.

Affected products

  • ISC · BIND 9

    • affected 9.11.0 – ≤ 9.16.50
    • affected 9.18.0 – ≤ 9.18.48
    • affected 9.20.0 – ≤ 9.20.22
    • affected 9.21.0 – ≤ 9.21.21
    • affected 9.11.3-S1 – ≤ 9.16.50-S1
    • affected 9.18.11-S1 – ≤ 9.18.48-S1
    • affected 9.20.9-S1 – ≤ 9.20.22-S1

What to do

Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.49, 9.20.23, 9.21.22, 9.18.49-S1, or 9.20.23-S1.

Workaround: No workarounds known.

Exploitation: We are not aware of any active exploits.

References

References4

Sources

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

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Record last updated .