What is CVE-2026-5950?

CVE-2026-5950 is a medium-severity vulnerability in Isc Bind, classified under CWE-606. CVSS score: 5.3/10. Published 2026-05-20.

How severe is CVE-2026-5950?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Isc Bind

CVE-2026-5950

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 co…

EPSS: 0.001 (34.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Isc Bind
Isc Bind 9 — versions 9.18.36, 9.20.8, 9.21.7

Weakness classification (CWE)

CWE-606

References

security-officer@isc.org (Patch, patch)
security-officer@isc.org (Patch, patch)
security-officer@isc.org (Patch, patch)
security-officer@isc.org (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-5950?: CVE-2026-5950 is a medium-severity vulnerability in Isc Bind, classified under CWE-606. CVSS score: 5.3/10. Published 2026-05-20.
How severe is CVE-2026-5950?: Medium severity. CVSS v3 base score is 5.3 out of 10.