PatchTheCVECVE-2026-97313: A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query
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This month
HIGH 7.5REMOTE
CVE-2026-97313 is a high-severity flaw (CVSS 7.5) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resulting in a denial of service. To be vulnerable, the BIND server must allow recursive queries and have at least two RPZ zones configured: one with the default setting of "recursive-only yes", and the other with "recursive-only no". This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.2
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 62%) |
| CISA exploited list | No |
| Weakness | CWE-617 |
| Published | 2026-10-21 |
| Last modified | 2026-10-22 |
Publisher (CNA): Internet Systems Consortium (ISC)
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source
sudo dnf upgrade --advisory=FEDORA-2026-95888f332b
Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source
sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273
Ubuntu 20.04 · isc-dhcp · NOT AFFECTED
Ubuntu 22.04 · isc-dhcp · NOT AFFECTED
Debian 12 · bind9 · NO FIX YET
Debian 13 · bind9 · FIXED · 1:9.20.30-1~deb13u1
sudo apt update && sudo apt install --only-upgrade bind9
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.20.30-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · bind · NO FIX YET
RHEL 6 · bind · NO FIX YET
RHEL 7 · bind · NO FIX YET
RHEL 8 · bind · NO FIX YET
RHEL 8 · bind9.16 · NO FIX YET
Alpine 3.22 · bind · FIXED · bind-9.20.30-r0
apk add --upgrade bind
apk info -v bind
Alpine 3.23 · bind · FIXED · bind-9.20.30-r0
apk add --upgrade bind
apk info -v bind
Alpine 3.24 · bind · FIXED · bind-9.20.30-r0
apk add --upgrade bind
apk info -v bind
Advisories and coverage
Official advisories
- Canadian Cyber Centre: ISC BIND security advisory (AV26-1072) 2026-10-21
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.