Threat Intelligence / CVE / CVE-2026-5950

CVE-2026-5950

CVSS 5.3 (MEDIUM) · EPSS 0.1% · Published 2026-05-20

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.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weaknesses (CWE)

CWE-606

Threats tracking this CVE

BIND 9 Multi-CVE Disclosure (May 2026) — Heap UAF in DoH (CVE-2026-3593), SIG(0) UAF (CVE-2026-5947), Resolver Resend Loop DoS (CVE-2026-5950), CLASS!=IN Assertion DoS (CVE-2026-5946), Glue Amplification (CVE-2026-3592), GSS-API TKEY Memory Exhaustion (CVE-2026-3039) — HIGH

References

Full detection coverage & IOCs for threats exploiting CVE-2026-5950 are available via the Threadlinqs MCP server (Purple tier). View plans →

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