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Ali 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.

USN-8401-1: Netty vulnerabilities

Ubuntu Security Advisories

3 days 13 hours ago

It 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)

USN-8402-1: systemd vulnerabilities

Ubuntu Security Advisories

3 days 13 hours ago

It was discovered that systemd-nspawn incorrectly handled certain optional configuration files. A local attacker could possibly use this issue to escape to the host system and execute arbitrary code. (CVE-2026-40226) It was discovered that systemd-resolved incorrectly validated DNSSEC records for signed domains. An attacker could possibly use this issue to manipulate DNS records. This issue only affected Ubuntu 22.04 LTS. (CVE-2023-7008)

USN-8400-1: poppler vulnerability

Ubuntu Security Advisories

3 days 14 hours ago

It was discovered that poppler incorrectly handled certain malformed PDF tiling patterns in the Splash backend. An attacker could possibly use this issue to execute arbitrary code, obtain sensitive information, or cause a denial of service.

USN-8399-1: Pillow vulnerabilities

Ubuntu Security Advisories

3 days 14 hours ago

It was discovered that Pillow incorrectly handled large glyph advance values in fonts. An attacker could possibly use this issue to cause Pillow to crash, resulting in a denial of service. (CVE-2026-42308) It was discovered that Pillow incorrectly handled nested coordinate lists in certain APIs. An attacker could possibly use this issue to cause Pillow to crash, resulting in a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42309) It was discovered that Pillow incorrectly handled certain malformed PDF files. An attacker could possibly use this issue to cause Pillow to use excessive resources, leading to a denial of service. (CVE-2026-42310) It was discovered that Pillow incorrectly handled certain malformed PSD files. An attacker could possibly use this issue to cause Pillow to crash, resulting in a denial of service, or to execute arbitrary code. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42311)

USN-8398-1: nginx vulnerability

Ubuntu Security Advisories

3 days 14 hours ago

It was discovered that nginx incorrectly handled certain cookie headers in the HTTP/2 implementation. A remote attacker could possibly use this issue to cause nginx to consume excessive resources, resulting in a denial of service.

USN-8397-1: libjxl vulnerability

Ubuntu Security Advisories

3 days 14 hours ago

It was discovered that libjxl did not properly handle certain crafted PBM images. An attacker could possibly use this issue to cause libjxl to crash, resulting in a denial of service, or execute arbitrary code.