CVSS 4.0
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката може да се автоматизира
Описание
Оригинално описание
NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and erroneously overwriting a destination pointer. An adversary can exploit the vulnerability by controlling a malicious signed zone and querying a vulnerable Unbound. When DS sub-queries need to suspend validation due to NSEC3 computational budget exhaustion (introduced in Unbound 1.19.1), Unbound deep-copies response messages to preserve them across memory region teardown. A struct-assignment bug overwrites the destination's pointer with the source's pointer. After the sub-query region is freed, the resumed validator dereferences this dangling pointer, triggering a crash or potentially enabling arbitrary code execution. Unbound 1.25.1 contains a patch with a fix to preserve the correct pointer when deep copying the data structure.
Засегнати продукти
- NLnet Labs Unbound: 1.19.1 преди 1.25.1
- Red Hat Red Hat Enterprise Linux 10: 0:1.24.2-7.el10_2.1 преди *
- Red Hat Red Hat Enterprise Linux 9: 0:1.24.2-3.el9_8.1 преди *
- Red Hat Red Hat Hardened Images: 1.25.1-0.1.hum1 преди *
- Red Hat Red Hat Enterprise Linux 6
- Red Hat Red Hat Enterprise Linux 7
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat OpenShift Container Platform 4
Вид слабост
История
- 20 май 2026 Публикувано
Други уязвимости в NLnet Labs Unbound
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-33278
- https://nvd.nist.gov/vuln/detail/CVE-2026-33278
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-33278.txt
- https://access.redhat.com/security/cve/CVE-2026-33278
- https://bugzilla.redhat.com/show_bug.cgi?id=2479808
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33278.json
- https://access.redhat.com/errata/RHSA-2026:23231
- https://access.redhat.com/errata/RHSA-2026:24369
- https://access.redhat.com/errata/RHSA-2026:19752