https://ubuntu.com/security/notices/rss.xmlRecent content on Ubuntu security notices2026 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd.http://www.rssboard.org/rss-specificationFeedgenWed, 21 Oct 2026 18:35:13 +0000https://ubuntu.com/security/notices/USN-8950-1It was discovered that poppler incorrectly handled the password length limit when decrypting certain encrypted PDF files. An attacker could possibly use this issue to cause a denial of service.https://ubuntu.com/security/notices/USN-8950-1Wed, 21 Oct 2026 16:53:02 +0000https://ubuntu.com/security/notices/USN-8930-2USN-8930-1 fixed some vulnerabilities in U-Boot. This update provides the corresponding fix for U-Boot on Ubuntu 26.10. Original advisory details: Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot incorrectly handled certain NFS READ and NFS READLINK responses. An attacker could possibly use this issue to trigger a buffer overflow, resulting in a denial of service or arbitrary code execution. (CVE-2026-74220, CVE-2026-74221) Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot incorrectly handled certain HTTP data storage failures in its lwIP implementation. An attacker could possibly use this issue to trigger a use-after-free, resulting in a denial of service. (CVE-2026-74222) Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot did not properly validate certain DHCPv6 option lengths during network boot. An attacker could possibly use this issue to trigger out-of-bounds memory access, resulting in a denial of service. (CVE-2026-74225)https://ubuntu.com/security/notices/USN-8930-2Wed, 21 Oct 2026 15:57:11 +0000https://ubuntu.com/security/notices/USN-8948-2USN-8948-1 fixed vulnerabilities in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10. This provides the corrosponding updates in Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. Original advisory details: It was discovered that PHP incorrectly handled out-of-memory conditions while processing requests. A remote attacker could use this issue to execute arbitrary code. (CVE-2026-109618) It was discovered that PHP incorrectly managed internal request state across worker reuse. A remote attacker could use this issue to execute arbitrary code. (CVE-2026-109619)https://ubuntu.com/security/notices/USN-8948-2Wed, 21 Oct 2026 15:33:58 +0000https://ubuntu.com/security/notices/USN-8948-1It was discovered that PHP incorrectly handled out-of-memory conditions while processing requests. A remote attacker could use this issue to execute arbitrary code. (CVE-2026-109618) It was discovered that PHP incorrectly managed internal request state across worker reuse. A remote attacker could use this issue to execute arbitrary code. (CVE-2026-109619)https://ubuntu.com/security/notices/USN-8948-1Wed, 21 Oct 2026 13:56:19 +0000https://ubuntu.com/security/notices/USN-8946-1It was discovered that Unbound incorrectly handled certain TCP connections. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. This issue only affected Ubuntu 26.04 LTS, Ubuntu 24.04 LTS, Ubuntu 22.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-80225) It was discovered that Unbound incorrectly handled certain DNS responses. A remote attacker could possibly use this issue to crash Unbound, resulting in a denial of service. (CVE-2026-81634) It was discovered that Unbound incorrectly handled certain DNS responses during DNSSEC validation. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. (CVE-2026-85501) It was discovered that Unbound incorrectly handled outgoing network ports. A remote attacker could possibly use this issue to crash Unbound, resulting in a denial of service. (CVE-2026-50252) It was discovered that Unbound incorrectly handled certain DNSCrypt packets. A remote attacker could possibly use this issue to crash Unbound, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS, Ubuntu 24.04 LTS, Ubuntu 22.04 LTS, Ubuntu 20.04 LTS and Ubuntu 18.04 LTS. (CVE-2026-40691) It was discovered that Unbound incorrectly handled certain cached DNS responses. A remote attacker could possibly use this issue to poison Unbound's cache. This issue only affected Ubuntu 26.04 LTS, Ubuntu 24.04 LTS, Ubuntu 22.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-44690) It was discovered that Unbound incorrectly handled certain DNS-over-QUIC connections. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-32665) It was discovered that Unbound incorrectly handled certain EDNS options. A remote attacker could possibly use this issue to crash Unbound, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-55973) Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered that Unbound incorrectly handled validating DNSSEC messages. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 16.04 LTS and Ubuntu 14.04 LTS. (CVE-2023-50387) It was discovered that Unbound incorrectly handled preparing an NSEC3 closest encloser proof. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 16.04 LTS and Ubuntu 14.04 LTS. (CVE-2023-50868)https://ubuntu.com/security/notices/USN-8946-1Wed, 21 Oct 2026 09:48:45 +0000https://ubuntu.com/security/notices/USN-8944-2USN-8944-1 updated ca-certificates. This update provides the corresponding changes for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS by removing the "emSign ECC Root CA - G3" and "Comodo AAA Services root" CA certificates. Original advisory details: This update removes the "emSign ECC Root CA - G3" CA certificate due to intermediate CA certificates being compromised. In addition, in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS, the ca-certificates package contained outdated CA certificates. This update refreshes the included certificates to those contained in the 2.90 version of the Mozilla certificate authority bundle.https://ubuntu.com/security/notices/USN-8944-2Tue, 20 Oct 2026 21:21:42 +0000https://ubuntu.com/security/notices/USN-8945-1It was discovered that XZ Utils incorrectly handled certain memory allocation failures when reinitializing decoders for specific compressed file formats. An attacker could possibly use this issue to trigger an invalid memory write, resulting in a denial of service or arbitrary code execution.https://ubuntu.com/security/notices/USN-8945-1Tue, 20 Oct 2026 17:45:10 +0000https://ubuntu.com/security/notices/USN-8944-1This update removes the "emSign ECC Root CA - G3" CA certificate due to intermediate CA certificates being compromised. In addition, in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS, the ca-certificates package contained outdated CA certificates. This update refreshes the included certificates to those contained in the 2.90 version of the Mozilla certificate authority bundle.https://ubuntu.com/security/notices/USN-8944-1Tue, 20 Oct 2026 15:52:06 +0000https://ubuntu.com/security/notices/USN-8942-1Multiple security issues were discovered in .NET and this update includes new upstream .NET versions to fix these issues. .NET 8 has been updated to 8.0.32 in Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. .NET 10 has been updated to 10.0.13 in Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10. .NET 11 has been updated to 11.0.0~rc2 in Ubuntu 26.10. In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes.https://ubuntu.com/security/notices/USN-8942-1Tue, 20 Oct 2026 15:15:07 +0000https://ubuntu.com/security/notices/USN-8943-1It was discovered that Protocol Buffers did not properly handle negative varint lengths or enforce recursion limits when parsing input in the PHP library. An attacker could possibly use this issue to cause applications using Protocol Buffers to crash or consume resources, resulting in a denial of service.https://ubuntu.com/security/notices/USN-8943-1Tue, 20 Oct 2026 14:49:32 +0000