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CVE-2026-5950Unbounded resend loop in BIND 9 resolver

Description

An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Timeline

  1. ID reserved

    By isc

  2. · 41 days 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-2026-5950, 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)
0.66% · top 48% of all CVEs (12 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 9.18.36 – ≤ 9.18.48
    • affected 9.20.8 – ≤ 9.20.22
    • affected 9.21.7 – ≤ 9.21.21
    • affected 9.18.36-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 .