Threats Tagged 'cve-2026-44390'

Multiple security vulnerabilities have been identified in the unbound DNS resolver packages used in Red Hat Enterprise Linux 8. These include denial of service issues caused by excessive EDNS options, large DNS resource record sets, and degraded resolution performance, as well as a cache manipulation vulnerability via a 'ghost domain names' attack. Red Hat has issued an important security advisory with updates addressing these issues.

Multiple security vulnerabilities have been identified in the unbound DNS resolver packages used in Red Hat Enterprise Linux 9. These include denial of service issues caused by excessive EDNS options, large DNS resource record sets, and degraded resolution performance, as well as a cache manipulation vulnerability via 'ghost domain names'. Red Hat has released security updates addressing these issues.

Multiple security vulnerabilities affecting the unbound DNS resolver in Red Hat Enterprise Linux 10 have been addressed. These include denial of service issues caused by excessive EDNS options, large DNS resource record sets, and degraded resolution performance, as well as a cache manipulation vulnerability via 'ghost domain names'. The vulnerabilities have been rated with a security impact of Important by Red Hat Product Security. Updates are available to remediate these issues in Red Hat Enterprise Linux 10 and related CodeReady Linux Builder products across multiple architectures.

This update includes the following RPMs: unbound: * python3-unbound-1.25.1-2.hum1 (aarch64, x86_64) * unbound-1.25.1-2.hum1 (aarch64, x86_64) * unbound-anchor-1.25.1-2.hum1 (aarch64, x86_64) * unbound-devel-1.25.1-2.hum1 (aarch64, x86_64) * unbound-dracut-1.25.1-2.hum1 (aarch64, x86_64) * unbound-libs-1.25.1-2.hum1 (aarch64, x86_64) * unbound-munin-1.25.1-2.hum1 (noarch) * unbound-utils-1.25.1-2.hum1 (aarch64, x86_64) * unbound-1.25.1-2.hum1.src (src)

This update includes the following RPMs: unbound: * python3-unbound-1.25.1-1.hum1 (aarch64, x86_64) * unbound-1.25.1-1.hum1 (aarch64, x86_64) * unbound-anchor-1.25.1-1.hum1 (aarch64, x86_64) * unbound-devel-1.25.1-1.hum1 (aarch64, x86_64) * unbound-dracut-1.25.1-1.hum1 (aarch64, x86_64) * unbound-libs-1.25.1-1.hum1 (aarch64, x86_64) * unbound-munin-1.25.1-1.hum1 (noarch) * unbound-utils-1.25.1-1.hum1 (aarch64, x86_64) * unbound-1.25.1-1.hum1.src (src)

NLnet Labs Unbound versions up to and including 1.25.0 contain a vulnerability related to inefficient algorithmic complexity in handling DNS replies with very large resource record sets (RRsets). This flaw can cause Unbound to spend excessive time applying name compression, potentially leading to degraded performance or denial of service. The issue arises when records do not share a suffix above the root, causing an unbounded operation in name compression. A fix was introduced in version 1.25.1 that correctly increments the compression counter regardless of compression tree lookup results, addressing this vulnerability.

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability when handling replies with very large RRsets that Unbound needs to perform name compression for. Malicious upstream responses with very large RRsets with records that don't share a suffix above the root can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. An adversary can exploit the vulnerability by querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. A compression limit was introduced in 1.21.1 for this but it didn't account for the case where records would not share any suffix above the root. That causes Unbound to go in a different code path because of the compression tree lookup failure and eventually not increment the compression counter for those operations. Unbound 1.25.1 contains a patch with a fix that increments the compression counter regardless of the compression tree lookup. This is a complement fix to CVE-2024-8508.