Vendor advisories

Ubuntu Security Notices

Browse 390 advisories from this official source. Search by product, CVE, severity, or advisory ID.

Current Checked 12 minutes ago Checked every 15 minutes

390 advisories

Each date says whether the vendor published or updated the bulletin. A vendor bulletin describes products that may be affected. It does not prove that the vulnerable product or version is installed in your environment.

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Ubuntu Security NoticesUSN-8957-1
Severity not listed

USN-8957-1: authd vulnerability

Ali Mashally discovered that authd did not properly validate user identities when matching accounts from identity providers. An attacker could possibly use this issue to gain access to another user's local account and files, resulting in unauthorized access to sensitive inform...

Ubuntu Security NoticesUSN-8956-1
Severity not listed

USN-8956-1: Brotli vulnerability

It was discovered that Brotli incorrectly handled certain compressed streams. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

Ubuntu Security NoticesUSN-8954-1
Severity not listed

USN-8954-1: zlib vulnerability

Ali Firas discovered that zlib incorrectly handled certain non-blocking write operations. An attacker could possibly use this issue to trigger a heap buffer overflow, resulting in a denial of service or arbitrary code execution.

Ubuntu Security NoticesUSN-8953-1
Severity not listed

USN-8953-1: OpenVPN vulnerability

It was discovered that OpenVPN incorrectly handled certificate subject fields. A remote authenticated user could possibly use this issue to impersonate other users.

Ubuntu Security NoticesUSN-8952-1
Severity not listed

USN-8952-1: Tornado vulnerabilities

It was discovered that Tornado did not properly handle certain HTTP requests and network inputs. An attacker could possibly use these issues to cause a denial of service, expose sensitive information, or bypass access controls. (CVE-2023-54397, CVE-2024-14029, CVE-2026-91990, ...

Ubuntu Security NoticesUSN-8890-2
Severity not listed

USN-8890-2: libsoup vulnerabilities

USN-8890-1 fixed vulnerabilities in libsoup. This update provides the corresponding updates for libsoup3 on Ubuntu 26.10. Original advisory details: It was discovered that libsoup incorrectly handled certain HTTP/2 requests. A remote attacker could possibly use this issue to c...

Vendor guidance

USN-8890-1 fixed vulnerabilities in libsoup.

Ubuntu Security NoticesUSN-8947-1
Severity not listed

USN-8947-1: NSS update

This update removes the "emSign ECC Root CA - G3" and "Comodo AAA Services root" CA certificate due to intermediate CA certificates being compromised.

Ubuntu Security NoticesUSN-8950-1
Severity not listed

USN-8950-1: poppler vulnerability

It 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.

Ubuntu Security NoticesUSN-8930-2
Severity not listed

USN-8930-2: U-Boot vulnerabilities

USN-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...

Vendor guidance

USN-8930-1 fixed some vulnerabilities in U-Boot.

Ubuntu Security NoticesUSN-8948-2
Severity not listed

USN-8948-2: PHP vulnerabilities

USN-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 PH...

Vendor guidance

USN-8948-1 fixed vulnerabilities in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10.

Ubuntu Security NoticesUSN-8948-1
Severity not listed

USN-8948-1: PHP vulnerabilities

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 r...

Ubuntu Security NoticesUSN-8946-1
Severity not listed

USN-8946-1: Unbound vulnerabilities

It 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 Security NoticesUSN-8944-2
Severity not listed

USN-8944-2: ca-certificates update

USN-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...

Vendor guidance

USN-8944-1 updated ca-certificates.

Ubuntu Security NoticesUSN-8945-1
Severity not listed

USN-8945-1: XZ Utils vulnerability

It 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...

Ubuntu Security NoticesUSN-8944-1
Severity not listed

USN-8944-1: ca-certificates update

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 refresh...

Vendor guidance

This update removes the "emSign ECC Root CA - G3" CA certificate due to intermediate CA certificates being compromised.

Ubuntu Security NoticesUSN-8942-1
Severity not listed

USN-8942-1: .NET vulnerabilities

Multiple 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 U...

Vendor guidance

Multiple security issues were discovered in .NET and this update includes new upstream .NET versions to fix these issues.

Ubuntu Security NoticesUSN-8943-1
Severity not listed

USN-8943-1: Protocol Buffers vulnerability

It 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, resu...

Ubuntu Security NoticesUSN-8708-2
Severity not listed

USN-8708-2: sudo-rs vulnerability

USN-8708-1 fixed a vulnerability in sudo-rs. This update provides the corresponding fix for Ubuntu 26.10. Original advisory details: It was discovered that sudo-rs incorrectly handled time-of-check vs time- of-use conditions in sudoedit. A local attacker with permission to edi...

Vendor guidance

USN-8708-1 fixed a vulnerability in sudo-rs.

Ubuntu Security NoticesUSN-8941-1
Severity not listed

USN-8941-1: Squid vulnerabilities

It was discovered that Squid incorrectly handled certain HTTP Transfer- Encoding headers. An attacker could possibly use this issue to perform HTTP request smuggling attacks, bypass security mechanisms, or poison web caches. (CVE-2026-61642) It was discovered that Squid incorr...

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Start with the vendor's bulletin.

We normalize the fields that vendors publish so you can search and compare advisories in one place. We do not replace the original bulletin or turn a product-name match into proof that a system is vulnerable.

Confirm the installed product and version, read the linked vendor guidance, and test the recommended update or mitigation through your normal change process.

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