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Ubuntu Security NoticesUSN-8861-1

USN-8861-1: OpenSSL vulnerabilities

It was discovered that OpenSSL had an inefficient algorithm in its QUIC stream reassembly implementation. A remote attacker could possibly use this issue to cause OpenSSL to use excessive CPU resources, leading to a denial of service. (CVE-2026-42772) It was discovered that OpenSSL did not properly limit memory allocated for QUIC packet buffers. A remote attacker could possibly use this issue to cause OpenSSL to use excessive memory resources, leading to a denial of service. (CVE-2026-54873)

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Scope

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Timeline

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  1. Published by Ubuntu

    The publication date reported by the vendor.

  2. Added to SecurityAlert

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  3. Confirmed at the source

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Vulnerabilities

CVEs named in this advisory

CVE-2026-42772View CVSS, KEV, EPSS, and threat contextCVE-2026-54873View CVSS, KEV, EPSS, and threat context
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