What is CVE-2026-77692?

CVE-2026-77692 is a high-severity vulnerability in Isc Bind 9, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-09-16.

How severe is CVE-2026-77692?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Isc Bind 9

CVE-2026-77692

An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS request with a cryptographically invalid SIG(0) record, and then closing the transport connection prematurely. This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.

Published 2026-09-16 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.066 (93.8th percentile), scored 2026-10-31.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.066 · change: +0.059

Affected products

Isc Bind 9

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

downloads.isc.org/isc/bind9/9.20.29 (patch)
downloads.isc.org/isc/bind9/9.21.26 (patch)
kb.isc.org/docs/cve-2026-77692 (vendor-advisory)

Frequently asked questions

What is CVE-2026-77692?: CVE-2026-77692 is a high-severity vulnerability in Isc Bind 9, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-09-16.
How severe is CVE-2026-77692?: High severity. CVSS v3 base score is 7.5 out of 10.