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 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a fix to prevent truncation of the EDNS field size calculation.
Засегнати продукти
- NLnet Labs Unbound: 1.14.0 преди 1.25.1
Red Hat: още 6 продукта, добавени от Red Hat
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7
Вид слабост
История
- 20 май 2026 Публикувано
Други уязвимости в NLnet Labs Unbound
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-42944
- https://nvd.nist.gov/vuln/detail/CVE-2026-42944
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42944.txt
- https://access.redhat.com/security/cve/CVE-2026-42944
- https://bugzilla.redhat.com/show_bug.cgi?id=2479774
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42944.json
- https://access.redhat.com/errata/RHSA-2026:23231
- https://access.redhat.com/errata/RHSA-2026:24365
- https://access.redhat.com/errata/RHSA-2026:24369
- https://access.redhat.com/errata/RHSA-2026:19752