Description
Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | unbound | 1.10.1-1 | — |
| Debian 13 | unbound | 1.10.1-1 | — |
| Debian 12 | unbound | 1.10.1-1 | — |
| Debian 10 | unbound | 1.9.0-2+deb10u2 | DSA-4694-1 |
| Debian 9 | unbound1.9 | 1.9.0-2+deb10u2~deb9u1 | DLA-2556-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | unbound | 1.9.4-2ubuntu1.1 | USN-4374-1 |
| Ubuntu 18.04 LTS | unbound | 1.6.7-1ubuntu2.3 | USN-4374-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | unbound | No fix yet | — |
| Ubuntu Pro 14.04 LTS | unbound | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | unbound +3 | 1.7.3-11.el8_2 | RHSA-2020:2416 |
| RHEL 7 | unbound +3 | 1.6.6-4.el7_8 | RHSA-2020:2414 |
| RHEL 6 | unbound +3 | 1.4.20-29.el6_10.1 | RHSA-2020:2640 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.1 EUS | unbound +3 | 1.7.3-9.el8_1 | RHSA-2020:2419 |
| RHEL 8.0 E4S | unbound +3 | 1.7.3-9.el8_0 | RHSA-2020:2418 |
| RHEL 7.7 EUS | unbound +3 | 1.6.6-2.el7_7 | RHSA-2020:4181 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | unbound | 1.6.8-10.3.1 | SUSE-SU-2020:1772-1 |
| SLES 15 SP1 | unbound | 1.6.8-10.3.1 | SUSE-SU-2020:1772-1 |
| SLES 15 | unbound | 1.6.8-3.6.1 | SUSE-SU-2020:1819-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | unbound | 1.6.8-3.6.1 | SUSE-SU-2020:1819-1 |
| SLE HPC 15 | unbound | 1.6.8-3.6.1 | SUSE-SU-2020:1819-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | unbound | 1.13.2-1.2 | openSUSE-SU-2024:11005-1 |
| openSUSE Leap 15.2 | unbound +1 | 1.6.8-lp152.9.3.1 | openSUSE-SU-2020:0913-1 |
| openSUSE Leap 15.1 | unbound +1 | 1.6.8-lp151.8.3.1 | openSUSE-SU-2020:0912-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | unbound | 1.10.1-r0 | — |
| Alpine v3.23 | unbound | 1.10.1-r0 | — |
| Alpine v3.22 | unbound | 1.10.1-r0 | — |
| Alpine v3.21 | unbound | 1.10.1-r0 | — |
| Alpine v3.20 | unbound | 1.10.1-r0 | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | unbound | 1.10.1-r0 | — |
| Alpine v3.18 | unbound | 1.10.1-r0 | — |
| Alpine v3.17 | unbound | 1.10.1-r0 | — |
| Alpine v3.16 | unbound | 1.10.1-r0 | — |
| Alpine v3.15 | unbound | 1.10.1-r0 | — |
| Alpine v3.14 | unbound | 1.10.1-r0 | — |
| Alpine v3.13 | unbound | 1.10.1-r0 | — |
| Alpine v3.12 | unbound | 1.10.1-r0 | — |
| Alpine v3.11 | unbound | 1.9.6-r1 | — |
| Alpine v3.10 | unbound | 1.9.1-r8 | — |
| Alpine v3.9 | unbound | 1.8.3-r4 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | unbound +3 | 1.6.6-1.amzn2.0.3 | ALAS2-2020-1430 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | unbound | 1.10.0-5 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | unbound +3 | 1.7.3-11.el8_2 | ELSA-2020-2416 |
| Oracle Linux 7 | unbound +3 | 1.6.6-4.el7_8 | ELSA-2020-2414 |
Advisories 17
- RHSA-2020:4181 Red Hat Security Advisory: unbound security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:2640 Red Hat Security Advisory: unbound security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:2418 Red Hat Security Advisory: unbound security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:2419 Red Hat Security Advisory: unbound security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:2416 Red Hat Security Advisory: unbound security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:2414 Red Hat Security Advisory: unbound security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4374-1 unbound vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4694-1 unbound - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2556-1 unbound1.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:1772-1 Security update for unbound SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1819-1 Security update for unbound SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11005-1 libunbound8-1.13.2-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0913-1 Security update for unbound SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0912-1 Security update for unbound SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2020-2414 Important: unbound security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 9, 2020
- ELSA-2020-2416 Important: unbound security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 8, 2020
- ALAS2-2020-1430 Important: unbound security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 20, 2020
References
- https://nlnetlabs.nl/downloads/unbound/CVE-2020-12662_2020-12663.txt
- [oss-security] 20200519 Unbound - CVE-2020-12662, CVE-2020-12663 mailing-list
- FEDORA-2020-3cfd38fefd vendor-advisory
- DSA-4694 vendor-advisory
- FEDORA-2020-8e9b62948e vendor-advisory
- USN-4374-1 vendor-advisory
- openSUSE-SU-2020:0912 vendor-advisory
- openSUSE-SU-2020:0913 vendor-advisory
- FreeBSD-SA-20:19 vendor-advisory
- [debian-lts-announce] 20210212 [SECURITY] [DLA 2556-1] unbound1.9 security update mailing-list