CVE-2026-19630
Amplified resource exhaustion in inbound message processing
Reported by isc · Published October 21, 2026
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| bind-license | errata.rockylinux.org | 32:9.18.33-15.el10_2.14.noarch |
| bind-doc | Amazon Linux | 32:9.18.50-1.amzn2023.0.5 |
| bind9.16-devel | errata.rockylinux.org | 32:9.16.23-0.22.el8_10.21.x86_64, 32:9.16.23-0.22.el8_10.21.i686 |
| bind-debugsource | errata.rockylinux.org | 32:9.18.33-15.el10_2.14.ppc64le, 32:9.16.23-40.el9_8.13.s390x |
| bind9.18-doc | errata.rockylinux.org | 32:9.18.29-14.el9_8.12.noarch |
| bind9.16-libs | errata.rockylinux.org | 32:9.16.23-0.22.el8_10.21.aarch64 |
| bind-pkcs11-devel | errata.rockylinux.org | 32:9.11.36-18.el8_10.x86_64, 32:9.11.36-18.el8_10.i686 |
| bind9.18 | errata.rockylinux.org | 32:9.18.29-14.el9_8.12.x86_64, 32:9.18.29-14.el9_8.12.src, 32:9.18.29-14.el9_8.12.aarch64 |
| bind-utils | errata.rockylinux.org | 32:9.16.23-40.el9_8.13.s390x, 32:9.16.23-40.el9_8.13.ppc64le, 32:9.11.36-18.el8_10.aarch64 |
| bind-libs-lite-debuginfo | errata.rockylinux.org | 32:9.11.36-18.el8_10.x86_64, 32:9.11.36-18.el8_10.i686, 32:9.11.36-18.el8_10.aarch64 |
| bind-utils-debuginfo | errata.rockylinux.org | 32:9.18.33-15.el10_2.14.s390x |
| bind-chroot | Amazon Linux | 32:9.18.50-1.amzn2023.0.5 |
21 more packages have a fixed version. See every fix in Lookup.
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| ISC | BIND 9 | 9.11.0, 9.20.0, 9.21.0 |
| amazon:2023 | bind-doc | 0 |
| amazon:2023 | bind-chroot | 0 |
| amazon:2 | bind-devel | 0 |
| ISC | BIND 9 | 9.20.0, 9.11.3-S1, 9.21.0 |
| amazon:2 | bind-export-libs | 0 |
| isc | bind | 9.20.9-S1, 9.11.0, 9.20.0 |
| amazon:2023 | bind | 0 |
| amazon:2 | bind-lite-devel | 0 |
| alpine | bind | 0 |
| amazon:2 | bind | 0 |
| amazon:2 | bind-chroot | 0 |
| amazon:2 | bind-libs-lite | 0 |
| amazon:2 | bind-libs | 0 |
| amazon:2 | bind-pkcs11-utils | 0 |
| amazon:2 | bind-sdb | 0 |
| amazon:2023 | bind-devel | 0 |
| amazon:2023 | bind-utils | 0 |
| amazon:2 | bind-pkcs11-devel | 0 |
| amazon:2023 | bind-dnssec-utils | 0 |
…and 8 more
Timeline
- Oct 21, 2026 CVE Published
- Oct 21, 2026 CVE Updated
- Oct 22, 2026 EPSS Score (3 in total, the first dated here)
- Oct 22, 2026 Coalition ESS Score
- Oct 31, 2026 Distribution Patch (15 in total, the first dated here)
- Oct 31, 2026 Security Advisory (11 in total, the first dated here)
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-19630
vulnetix vdb fixes CVE-2026-19630Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-19630/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- CVE-2026-19630 vendor-advisory
- patch
- patch