Description
iterator.c in NLnet Labs Unbound before 1.5.1 does not limit delegation chaining, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a large or infinite number of referrals.
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 | 1.4.22-3 | — |
| Debian 13 | unbound | 1.4.22-3 | — |
| Debian 12 | unbound | 1.4.22-3 | — |
| Debian 7 | unbound | 1.4.17-3+deb7u2 | DSA-3097-1 |
| Debian 6.0 | unbound | 1.4.6-1+squeeze4 | DLA-107-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | unbound | 1.4.22-1ubuntu4.14.04.1 | USN-2484-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | unbound +3 | 1.4.20-26.el7 | RHSA-2015:2455 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | unbound | 1.5.10-1.1 | openSUSE-SU-2024:10121-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | unbound +3 | 1.4.20-26.el7 | ELSA-2015-2455 |
Advisories 6
- RHSA-2015:2455 Red Hat Security Advisory: unbound security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-2484-1 unbound vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3097-1 unbound - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-107-1 unbound - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10121-1 libunbound-devel-mini-1.5.10-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2015-2455 Low: unbound security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 23, 2015
References
- 71589 vdb-entry
- http://unbound.net/downloads/patch_cve_2014_8602.diff
- http://cert.ssi.gouv.fr/site/CERTFR-2014-AVI-512/index.html
- DSA-3097 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- VU#264212 third-party-advisory
- https://unbound.net/downloads/CVE-2014-8602.txt
- USN-2484-1 vendor-advisory