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-specificationFeedgenFri, 11 Sep 2026 15:00:40 +0000https://ubuntu.com/security/notices/USN-8571-2USN-8571-1 fixed vulnerabilities in Apache HTTP Server. That fix was incomplete due to a missing library symbol, resulting in a regression that could cause Apache HTTP Server to fail to start when HTTP/2 proxying was enabled. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Pavel Kohout and Arkadi Vainbrand discovered that Apache HTTP Server incorrectly handled certain memory operations in mod_authn_socache. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-33007) Haruki Oyama, Merih Mengisteab, and Dawit Jeong discovered that Apache HTTP Server had an HTTP response splitting vulnerability in multiple modules when used with untrusted or compromised backend servers. An attacker could possibly use this issue to inject arbitrary HTTP headers. (CVE-2026-33523) Elhanan Haenel discovered that Apache HTTP Server incorrectly handled certain memory operations in mod_proxy_ajp. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-33857) Tianshuo Han and Jérôme Djouder discovered that Apache HTTP Server incorrectly handled certain string operations in mod_proxy_ajp. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-34032) It was discovered that Apache HTTP Server's mod_proxy_html module incorrectly handled certain content from an untrusted backend. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-34355) It was discovered that Apache HTTP Server incorrectly handled ProxyPassReverseCookie directives with a malicious backend server. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-34356) It was discovered that Apache HTTP Server's mod_dav_fs module incorrectly handled certain path operations. An authenticated user could possibly use this issue to manipulate trusted WebDAV property databases or cause a denial of service. (CVE-2026-42535) It was discovered that Apache HTTP Server's mod_xml2enc module incorrectly handled certain content from an untrusted backend. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-42536) It was discovered that Apache HTTP Server incorrectly handled response headers when multiple content languages were configured. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-43951) It was discovered that Apache HTTP Server incorrectly restricted certain file functions in expressions within .htaccess files. A local attacker with .htaccess write access could possibly use this issue to obtain sensitive information. (CVE-2026-44119) It was discovered that Apache HTTP Server's mod_ssl module incorrectly handled OCSP responses from an attacker-controlled server. A remote attacker could possibly use this issue to obtain sensitive information or cause a denial of service. (CVE-2026-44185) It was discovered that Apache HTTP Server's mod_proxy_ftp module incorrectly handled responses from an attacker-controlled backend FTP server. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-44186) It was discovered that Apache HTTP Server incorrectly handled crafted regular expressions in the server configuration. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-44631) It was discovered that Apache HTTP Server's mod_http2 module had a use-after-free vulnerability when file handles were exhausted. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-48913)https://ubuntu.com/security/notices/USN-8571-2Thu, 10 Sep 2026 19:36:17 +0000https://ubuntu.com/security/notices/USN-8747-1It was discovered that Beets incorrectly escaped untrusted media metadata in its web interface. An attacker could possibly use this issue to inject arbitrary HTML or execute arbitrary JavaScript code in a user's browser.https://ubuntu.com/security/notices/USN-8747-1Thu, 10 Sep 2026 15:56:46 +0000https://ubuntu.com/security/notices/USN-8746-1It was discovered that libEBML incorrectly handled certain read and write operations. An attacker could possibly use this issue to cause a buffer overflow, resulting in a denial of service.https://ubuntu.com/security/notices/USN-8746-1Thu, 10 Sep 2026 15:48:52 +0000https://ubuntu.com/security/notices/USN-8745-1It was discovered that KissFFT incorrectly handled certain large Fourier transform sizes on 32-bit architectures. An attacker could possibly use this issue to cause KissFFT to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2025-34297) It was discovered that KissFFT incorrectly handled certain multidimensional Fourier transform sizes. An attacker could possibly use this issue to cause KissFFT to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-41445)https://ubuntu.com/security/notices/USN-8745-1Thu, 10 Sep 2026 15:36:46 +0000https://ubuntu.com/security/notices/USN-8748-1Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Hardware crypto device drivers; - NVIDIA Tegra memory controller driver; - Network drivers; - GFS2 file system; - OCFS2 file system; - SMB network file system; - B.A.T.M.A.N. meshing protocol; - Ceph Core library; - IPv4 networking; - IPv6 networking; - Netfilter; - Open vSwitch; - RxRPC session sockets; - SCTP protocol; - TIPC protocol; (CVE-2026-52914, CVE-2026-52931, CVE-2026-52955, CVE-2026-52958, CVE-2026-52982, CVE-2026-52986, CVE-2026-52993, CVE-2026-52999, CVE-2026-53002, CVE-2026-53006, CVE-2026-53010, CVE-2026-53043, CVE-2026-53045, CVE-2026-53046, CVE-2026-53049, CVE-2026-53055, CVE-2026-53088, CVE-2026-53151, CVE-2026-53175, CVE-2026-53215, CVE-2026-53216, CVE-2026-53224, CVE-2026-53246, CVE-2026-53247, CVE-2026-53260, CVE-2026-53309, CVE-2026-64531) https://ubuntu.com/security/notices/USN-8748-1Thu, 10 Sep 2026 15:32:51 +0000https://ubuntu.com/security/notices/USN-8744-1It was discovered that Python's http.cookies module incorrectly handled control characters in certain cookie operations. An attacker could possibly use this issue to inject arbitrary content. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-3644) It was discovered that the Python pyexpat module was vulnerable to unbounded recursion in the Expat XML parser. An attacker could possibly use this issue to cause Python to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-4224) It was discovered that Python's tarfile module did not correctly apply the filter parameter when extracting hard links. An attacker could possibly use this issue to cause files to be extracted with an unexpected uid or gid, bypassing the restrictions requested via filter='data'. (CVE-2026-4360) It was discovered that Python's http.cookies module incorrectly escaped values in the js_output() method. An attacker could possibly use this issue to inject arbitrary JavaScript. (CVE-2026-6019) It was discovered that Python's html.parser module incorrectly handled repeated unterminated markup declarations. An attacker could possibly use this issue to cause Python to consume excessive CPU resources, leading to a denial of service. (CVE-2026-15308)https://ubuntu.com/security/notices/USN-8744-1Thu, 10 Sep 2026 13:53:24 +0000https://ubuntu.com/security/notices/USN-8743-1It was discovered that PHP incorrectly handled backslash escaping in the PostgreSQL extension. An attacker could use this issue to perform SQL injection attacks. (CVE-2026-17543) It was discovered that PHP incorrectly handled certain inputs to the bccomp() function. An attacker could use this issue to cause an out-of- bounds write, resulting in a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-17544) It was discovered that PHP incorrectly handled circular symbolic links in phar archives. An attacker could use this issue to cause unbounded recursion, resulting in a denial of service. (CVE-2026-7260)https://ubuntu.com/security/notices/USN-8743-1Thu, 10 Sep 2026 11:48:08 +0000https://ubuntu.com/security/notices/USN-8737-2USN-8737-1 fixed vulnerabilities in GNU C Library. This update provides the corresponding fixes for Ubuntu 24.04 LTS. Original advisory details: It was discovered that GNU C Library had a buffer overflow in the strfmon function when handling right-justification padding. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-19499) It was discovered that GNU C Library had an out-of-bounds stack array access in the tdelete function. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-19542) It was discovered that GNU C Library incorrectly handled memory when calling wordexp with the WRDE_APPEND flag. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-6368) It was discovered that GNU C Library had a stack overflow in the wordexp function when expanding paths beginning with a tilde followed by a long username. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-6791) It was discovered that GNU C Library had a hang in the SHIFT_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-77117) It was discovered that GNU C Library had a hang in the EUC_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-80489)https://ubuntu.com/security/notices/USN-8737-2Thu, 10 Sep 2026 11:25:21 +0000https://ubuntu.com/security/notices/USN-8742-1It was discovered that Netty incorrectly validates the bailiwick of NS records. An attacker could possibly use this issue to facilitate DNS cache poisoning attacks.https://ubuntu.com/security/notices/USN-8742-1Thu, 10 Sep 2026 09:01:53 +0000https://ubuntu.com/security/notices/USN-8741-1It was discovered that Flatpak did not properly validate paths in sandbox-expose options. A malicious or compromised Flatpak app could use app-controlled symlinks to access arbitrary host files and gain code execution in the host context. This issue was addressed in Ubuntu Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-34078) It was discovered that Flatpak did not properly validate paths when removing outdated ld.so cache files. A malicious or compromised Flatpak app could use this issue to delete arbitrary files on the host. (CVE-2026-34079)https://ubuntu.com/security/notices/USN-8741-1Thu, 10 Sep 2026 08:44:18 +0000