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-specificationFeedgenThu, 18 Jun 2026 22:30:03 +0000https://ubuntu.com/security/notices/USN-8447-2USN-8447-1 fixed vulnerabilities in Go Cryptography. This update provides the corresponding updates for Go Cryptography code embedded in LXD for CVE-2026-39830, CVE-2026-39833, CVE-2026-39834, and CVE-2026-42508. Original advisory details: It was discovered that Go Cryptography did not properly handle SSH global request responses. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-39830) It was discovered that Go Cryptography did not properly verify user presence when using FIDO/U2F security keys. An attacker could possibly use this issue to bypass user presence verification for hardware security keys. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-39831) It was discovered that Go Cryptography did not properly serialize SSH agent key constraint extensions. An attacker could possibly use this issue to bypass intended key usage restrictions. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-39832) It was discovered that Go Cryptography did not properly enforce the confirm-before-use constraint in the SSH agent keyring. An attacker could possibly use this issue to use SSH keys without the required user confirmation. (CVE-2026-39833) It was discovered that Go Cryptography had an integer overflow when handling large SSH channel writes. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-39834) It was discovered that Go Cryptography did not properly check certificate authority key revocation. An attacker could possibly use this issue to bypass certificate authority revocation checks. 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-2026-42508) It was discovered that Go Cryptography did not properly enforce the source- address critical option for all SSH server callback types. An attacker could possibly use this issue to bypass source address authorization restrictions. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-46595)https://ubuntu.com/security/notices/USN-8447-2Thu, 18 Jun 2026 20:05:09 +0000https://ubuntu.com/security/notices/USN-8454-1Elhanan Haenel discovered that libheif incorrectly handled certain malformed HEIF sequence files. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-32738) Elhanan Haenel discovered that libheif incorrectly handled certain malformed HEIF sequence files, leading to an infinite loop. An attacker could possibly use this issue to cause libheif to use excessive resources, resulting in a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-32739) Elhanan Haenel discovered that libheif incorrectly handled certain crafted HEIF/AVIF image files. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-32740) It was discovered that libheif incorrectly handled certain crafted HEIF files containing mask images. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-32741) It was discovered that libheif incorrectly handled certain crafted grid-based HEIF/AVIF files. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-32814) It was discovered that libheif incorrectly handled certain crafted HEIF files when compositing overlay images. An attacker could possibly use this issue to cause a denial of service or obtain sensitive information. (CVE-2026-32882) It was discovered that libheif incorrectly handled certain crafted files. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-3950) It was discovered that libheif incorrectly handled certain malformed HEIF sequence files. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-41069) It was discovered that libheif incorrectly handled certain crafted HEIF sequence files. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-41071)https://ubuntu.com/security/notices/USN-8454-1Thu, 18 Jun 2026 16:41:59 +0000https://ubuntu.com/security/notices/USN-8452-1Nikita Skovoroda discovered that pbkdf2 did not properly validate certain algorithm names. An attacker could possibly use this issue to generate predictable cryptographic keys, resulting in signature spoofing.https://ubuntu.com/security/notices/USN-8452-1Thu, 18 Jun 2026 16:30:44 +0000https://ubuntu.com/security/notices/USN-8453-1It was discovered that Net::CIDR::Lite incorrectly validated IP address and CIDR mask inputs. An attacker could possibly use this issue to bypass IP access control lists. (CVE-2026-45190) It was discovered that Net::CIDR::Lite incorrectly handled extraneous zero characters in CIDR mask values. An attacker could possibly use this issue to bypass IP access control lists. (CVE-2026-45191)https://ubuntu.com/security/notices/USN-8453-1Thu, 18 Jun 2026 16:15:55 +0000https://ubuntu.com/security/notices/USN-8451-1Srinivas Piskala Ganesh Babu discovered that Vim incorrectly handled directory names when serializing browsed paths to the netrw history file. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-47162) It was discovered that Vim incorrectly handled step-definition patterns in the cucumber filetype plugin. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-47167) It was discovered that Vim incorrectly handled import statements during Python omni-completion. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-52858) Andrej Tomči discovered that Vim incorrectly handled certain terminal screen cells when taking a snapshot, leading to an out-of-bounds read. An attacker could possibly use this issue to cause Vim to crash, resulting in a denial of service. (CVE-2026-52859) David Carliez discovered that Vim incorrectly handled reconstructed function and class definitions during Python omni-completion. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-52860)https://ubuntu.com/security/notices/USN-8451-1Thu, 18 Jun 2026 16:05:59 +0000https://ubuntu.com/security/notices/USN-8450-1It was discovered that Tomcat did not properly limit the size of WebDAV LOCK and PROPFIND request bodies. A remote attacker could possibly use this issue to cause Tomcat to consume excessive memory, resulting in a denial of service. (CVE-2026-41284) It was discovered that Tomcat incorrectly validated HTTP/2 header fields. A remote attacker could use this issue to cause Tomcat to crash or possibly execute arbitrary code. (CVE-2026-41293) It was discovered that Tomcat did not properly clear HTTP authentication headers during WebSocket connection upgrades and redirects. A remote attacker could possibly use this issue to obtain sensitive credentials. (CVE-2026-42498) It was discovered that Tomcat incorrectly handled authorization when multiple method constraints defined the same HTTP method. A remote attacker could possibly use this issue to bypass authorization restrictions. (CVE-2026-43515)https://ubuntu.com/security/notices/USN-8450-1Thu, 18 Jun 2026 15:56:22 +0000https://ubuntu.com/security/notices/USN-8449-1Pablo Ruiz discovered that ldns did not properly validate DNS responses when used as a stub resolver over UDP. A remote attacker could possibly use this issue to inject arbitrary DNS responses.https://ubuntu.com/security/notices/USN-8449-1Thu, 18 Jun 2026 13:33:51 +0000https://ubuntu.com/security/notices/USN-8442-1It was discovered that kitty incorrectly handled certain image data. An attacker able to write to the terminal's input could possibly use this issue to cause kitty to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33633) It was discovered that kitty incorrectly handled certain graphics commands. An attacker able to write escape sequences to a kitty terminal could possibly use this issue to cause kitty to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33642)https://ubuntu.com/security/notices/USN-8442-1Wed, 17 Jun 2026 15:37:12 +0000https://ubuntu.com/security/notices/USN-8390-2It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to escalate privileges, or possibly escape a container. https://ubuntu.com/security/notices/USN-8390-2Wed, 17 Jun 2026 10:34:42 +0000https://ubuntu.com/security/notices/USN-8441-1It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-31431) Several 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: - Cryptographic API; - Packet sockets; (CVE-2026-31504, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-46028) https://ubuntu.com/security/notices/USN-8441-1Wed, 17 Jun 2026 10:27:10 +0000