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-specificationFeedgenTue, 09 Jun 2026 13:10:06 +0000https://ubuntu.com/security/notices/USN-8044-2USN-8044-1 fixed a vulnerability in alsa-lib. This update provides the corresponding fix for alsa-lib on Ubuntu 20.04 LTS. Original advisory details: It was discovered that alsa-lib incorrectly handled the topology mixer control decoder. A local attacker could use a specially crafted topology file to cause alsa-lib to crash, resulting in a denial of service, or possibly execute arbitrary code.https://ubuntu.com/security/notices/USN-8044-2Tue, 09 Jun 2026 09:23:55 +0000https://ubuntu.com/security/notices/USN-8410-1Akshat Sinha discovered that shell-quote improperly validated object-token inputs. An attacker could possibly use this issue to cause shell-quote to crash, resulting in a denial of service, or execute arbitrary code.https://ubuntu.com/security/notices/USN-8410-1Tue, 09 Jun 2026 08:38:23 +0000https://ubuntu.com/security/notices/USN-8408-1It was discovered that Twig did not properly validate PHP callables when using a source policy. An authenticated user could possibly use this issue to execute arbitrary code.https://ubuntu.com/security/notices/USN-8408-1Mon, 08 Jun 2026 19:36:58 +0000https://ubuntu.com/security/notices/USN-8407-1Elliott Childre discovered that strongSwan incorrectly handled the cloning of certain identities. A remote attacker could use this issue to cause strongSwan to crash, resulting in a denial of service, or possibly execute arbitrary code.https://ubuntu.com/security/notices/USN-8407-1Mon, 08 Jun 2026 17:28:38 +0000https://ubuntu.com/security/notices/USN-8349-2USN-8349-1 fixed vulnerabilities in rsync. The update introduced multiple regressions in rsync functionality. This update fixes the problem. Original advisory details: Calum Hutton discovered that rsync contained a heap-based out-of-bounds read when handling file transfers. A remote attacker with read access to an rsync server could possibly use this issue to cause a denial of service. (CVE-2025-10158) Batuhan Sancak, Damien Neil, and Michael Stapelberg discovered that rsync daemons configured without chroot protection were exposed to a race condition on parent path components. A local attacker with write access to a module could possibly use this issue to overwrite files, obtain sensitive information, or escalate privileges. (CVE-2026-29518) It was discovered that rsync did not properly validate a length value while sorting extended attributes. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-41035) It was discovered that rsync performed reverse-DNS lookups after chrooting in some daemon configurations. A remote attacker could possibly use this issue to bypass hostname-based access controls and access network services. (CVE-2026-43617) Omar Elsayed discovered that rsync did not properly check for integer overflows while decoding compressed tokens. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-43618) Andrew Tridgell discovered that rsync did not fully fix a symlink race condition in path-based system calls for daemons configured without chroot protection. A local attacker could possibly use this issue to overwrite files, obtain sensitive information, or escalate privileges. (CVE-2026-43619) Pratham Gupta discovered that rsync did not properly validate an index while processing file lists. A remote attacker could possibly use this issue to cause rsync to crash, resulting in a denial of service. (CVE-2026-43620) Michal Ruprich discovered that rsync contained an off-by-one error while handling HTTP proxy responses. An attacker able to intercept network communications or a malicious proxy server could possibly use this issue to cause a denial of service. (CVE-2026-45232)https://ubuntu.com/security/notices/USN-8349-2Mon, 08 Jun 2026 16:41:09 +0000https://ubuntu.com/security/notices/USN-8406-1Dave Rolsky discovered that Net::CIDR::Lite did not properly handle extraneous zero characters at the beginning of an IP address string. A remote attacker could possibly use this issue to bypass access controls that are based on IP addresses. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2021-47154) It was discovered that Net::CIDR::Lite did not properly validate the IPv6 group count when handling uncompressed IPv6 addresses. A remote attacker could possibly use this issue to bypass access controls. (CVE-2026-40198) It was discovered that Net::CIDR::Lite mishandled IPv4 mapped IPv6 addresses. A remote attacker could possibly use this issue to bypass access controls that are based on IP addresses. (CVE-2026-40199)https://ubuntu.com/security/notices/USN-8406-1Mon, 08 Jun 2026 16:06:45 +0000https://ubuntu.com/security/notices/USN-8405-1Ariel Silver discovered that CUPS incorrectly handled username comparisons during authorization checks. A local attacker could possibly use this issue to gain unauthorized access to restricted operations. (CVE-2026-27447) Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled notify-recipient-uri values in the RSS notifier. A remote attacker could possibly use this issue to overwrite lp-writable files and cause a denial of service. (CVE-2026-34978) Jacob Newman discovered that CUPS incorrectly handled filter option strings when processing job attributes. An attacker could use this issue to cause CUPS to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-34979) Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled page-border values in shared PostScript queues. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-34980) Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled localhost authentication to attacker-controlled IPP services. A local attacker could possibly use this issue to overwrite arbitrary files and execute arbitrary code. (CVE-2026-34990) Tomer Fichman discovered that CUPS incorrectly handled negative job-password-supported values. A local attacker could possibly use this issue to cause CUPS to crash, resulting in a denial of service. (CVE-2026-39314) Tomer Fichman discovered that CUPS incorrectly handled temporary printer deletion. An attacker could possibly use this issue to cause CUPS to crash, resulting in a denial of service, or to execute arbitrary code. (CVE-2026-39316) Tomer Fichman discovered that CUPS incorrectly handled certain malformed SNMP responses. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-41079)https://ubuntu.com/security/notices/USN-8405-1Mon, 08 Jun 2026 15:51:32 +0000https://ubuntu.com/security/notices/USN-8404-1It was discovered that Transmission had a clickjacking weakness in the browser-facing WebUI and RPC response paths. An attacker could possibly use this issue to trick users into performing unintended actions.https://ubuntu.com/security/notices/USN-8404-1Mon, 08 Jun 2026 15:15:55 +0000https://ubuntu.com/security/notices/USN-8403-1Ali Norouzi discovered that Kea DHCP did not properly handle maliciously crafted messages over configured API sockets and HA listeners. A remote attacker could possibly use this issue to cause Kea DHCP to crash, resulting in a denial of service.https://ubuntu.com/security/notices/USN-8403-1Mon, 08 Jun 2026 14:28:06 +0000https://ubuntu.com/security/notices/USN-8401-1It was discovered that Netty's HTTP proxy handler did not properly validate headers when constructing CONNECT requests. An attacker could possibly use this issue to inject arbitrary HTTP headers into CONNECT requests. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-42578) It was discovered that Netty's DNS codec did not properly enforce domain name constraints. An attacker could possibly use this issue to bypass domain name validation, or cause Netty to consume resources, leading to a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-42579) It was discovered that Netty did not correctly handle HTTP/1.0 requests containing both a Transfer-Encoding and Content-Length header. A remote attacker could possibly use this issue to perform HTTP request smuggling attacks. (CVE-2026-42581) Violeta Georgieva discovered that Netty incorrectly paired responses with requests when handling informational HTTP responses. A remote attacker could possibly use this issue to perform HTTP request smuggling attacks. (CVE-2026-42584) Violeta Georgieva discovered that Netty incorrectly parsed malformed Transfer-Encoding headers. A remote attacker could possibly use this issue to perform HTTP request smuggling attacks. (CVE-2026-42585) It was discovered that Netty's Redis encoder did not validate CRLF characters. An attacker could possibly use this issue to inject arbitrary Redis commands. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-42586)https://ubuntu.com/security/notices/USN-8401-1Mon, 08 Jun 2026 13:38:28 +0000