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CVE-2026-27135 is a reachable assertion vulnerability in nghttp2, a C implementation of HTTP/2, affecting upstream versions before 1.68.1. Missing internal state validation allows the library to continue processing incoming data after nghttp2_session_terminate_session or nghttp2_session_terminate_session2 is called. These APIs can be invoked by an application or internally when nghttp2 detects a connection-error condition. A subsequently processed malformed HTTP/2 frame that causes FRAME_SIZE_ERROR can trigger an assertion failure and terminate the affected application or service, resulting in denial of service.
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A denial-of-service vulnerability in the nghttp2 HTTP/2 library before version 1.68.1. Missing internal state validation allows continued processing of incoming data after session termination APIs are called. A malformed frame can then trigger an assertion failure. The reported CVSS v3 base score is 7.5, with network access, no required privileges or user interaction, and high availability impact. Upstream version 1.68.1 fixes the flaw; the listed Echo package update is version 1.64.0-1.1+e1 or later.
A network-reachable denial-of-service vulnerability in nghttp2 before 1.68.1. Insufficient internal state validation after session termination can allow a malformed HTTP/2 frame to cause an assertion failure and disrupt availability.
A remotely exploitable, low-complexity vulnerability requiring no privileges or user interaction that affects availability but has no stated confidentiality or integrity impact.
A vulnerability addressed by the referenced AlmaLinux security update; the supplied content does not identify the affected component or technical vulnerability type.
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