CVE-2026-19630
published 2026-10-21CVE-2026-19630: 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…
PriorityP343high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.45%
38.7th percentile
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.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| isc | bind | — | — |
| isc | bind_9 | 9.11.0 – 9.18.50 | — |
| isc | bind_9 | 9.11.3-S1 – 9.18.50-S1 | — |
| isc | bind_9 | 9.20.0 – 9.20.29 | — |
| isc | bind_9 | 9.20.9-S1 – 9.20.29-S1 | — |
| isc | bind_9 | 9.21.0 – 9.21.26 | — |
| isc | dhcp | — | — |
| openshift | ose-rhel-coreos-8 | — | — |
| openshift | ose-rhel-coreos-9 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
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Red Hat
bind: BIND: Denial of Service via unbounded processing of crafted DNS messages
vendor_redhat·2026-10-21·CVSS 7.5
CVE-2026-19630 [HIGH] CWE-770 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages
bind: BIND: Denial of Service via unbounded processing of crafted DNS messages
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.
A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending specially crafted Domain Name System (DNS) protocol messages containing an excessive number of specific structures. Because BIND does not impose a limit on
GHSA
In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND.
ghsa_unreviewed·2026-10-21
CVE-2026-19630 [HIGH] CWE-407 In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-19630 dhcp: BIND: Denial of Service via unbounded processing of crafted DNS messages [fedora-all]
bugzilla·2026-10-21·CVSS 7.5
CVE-2026-19630 [HIGH] CVE-2026-19630 dhcp: BIND: Denial of Service via unbounded processing of crafted DNS messages [fedora-all]
CVE-2026-19630 dhcp: BIND: Denial of Service via unbounded processing of crafted DNS messages [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-19630 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages [fedora-all]
bugzilla·2026-10-21·CVSS 7.5
CVE-2026-19630 [HIGH] CVE-2026-19630 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages [fedora-all]
CVE-2026-19630 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-19630 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages
bugzilla·2026-10-20·CVSS 7.5
CVE-2026-19630 [HIGH] CVE-2026-19630 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages
CVE-2026-19630 bind: BIND: Denial of Service via unbounded processing of crafted DNS messages
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.
2026-10-21
Published