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26 February 2026

Vulnerabilities first published on this day (UTC), newest first.

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All Critical High Medium Low Exploited only Public exploit

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  • High 7.5
    CVE-2026-27959 Public exploit

    Koa has Host Header Injection via `ctx.hostname`

    Koa is middleware for Node.js using ES2017 async functions. Prior to versions 3.1.2 and 2.16.4, Koa's `ctx.hostname` API performs naive parsing of the HTTP Host header, extracting everything before the first colon without validating the input conforms to RFC …

    koajs koa koa npm
  • High 7.7
    CVE-2026-27938 Public exploit

    WPGraphQL Repo Vulnerable to Command Injection via Unsanitized GitHub Actions Expression in Release Workflow

    WPGraphQL provides a GraphQL API for WordPress sites. Prior to version 2.9.1, the `wp-graphql/wp-graphql` repository contains a GitHub Actions workflow (`release.yml`) vulnerable to OS command injection through direct use of `${{ github.event.pull_request.bod…

    WPGraphQL wp-graphql
  • High 7.5
    CVE-2026-27831 Public exploit

    rldns Vulnerable to Heap-based Out-of-Bounds Read

    rldns is an open source DNS server. Version 1.3 has a heap-based out-of-bounds read that leads to denial of service. Version 1.4 contains a patch for the issue.

    bluedragonsecurity rldns