CVE-2026-19630CWE-407

CVE-2026-19630

High · published October 21, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
38.0
In the wild
Unconfirmed
What it is

In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND. A DNS message with a maliciously large number of such structures will cause BIND to consume disproportionate amounts of CPU time and memory during processing.

This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00448 · 38.0th percentile
Weakness
CWE-407 · Inefficient Algorithmic Complexity
Published
2026-10-21T17:18Z
References (3)
https://downloads.isc.org/isc/bind9/9.20.30 · [email protected]https://downloads.isc.org/isc/bind9/9.21.27 · [email protected]https://kb.isc.org/docs/cve-2026-19630 · [email protected]
EPSS history
Timeline
  • 23 OCT 03:56Z
    EPSS moved — → 0%
    epss
  • 21 OCT 12:41Z
    Amplified resource exhaustion in inbound message processing
    cvelistv5
  • 21 OCT 12:41Z
    Amplified resource exhaustion in inbound message processing
    cvelistv5