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5.3 Medium

CVE-2026-5950 An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling,…

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.

Affected products and versions

Product Affected versions Fixed in
BIND 9 9.21 9.21.7 → 9.21.21 No fix stated
BIND 9 9.20 9.20.8 → 9.20.22 No fix stated
BIND 9 9.18 9.18.36-S1 → 9.18.48 No fix stated

Other CVEs of BIND 9

The 87 CVEs of BIND 9 →
CVE-2026-97313 A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may… 7.5 High CVE-2026-96888 A BIND resolver that is configured with both a "redirect" zone and "qname-minimization strict" may abort with an… 7.5 High CVE-2026-94300 Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`" 8.1 High CVE-2026-19630 In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with… 7.5 High
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