{
  "cveId": "CVE-2026-58055",
  "url": "https://patchblox.com/security/cve/CVE-2026-58055",
  "summary": "CVE-2026-58055 is fixed in 14 products on 1 platform, first by libnghttp2-14 1.68.0-2ubuntu0.2, released June 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length",
  "description": "libnghttp2 is a library implementing the Hypertext Transfer Protocol version 2 (HTTP/2) protocol in C.\n\nSecurity Fix(es):\n\n* nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests (CVE-2026-58055)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "published": "2026-06-27T19:16:00Z",
  "severity": "Moderate",
  "cvss": 5.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
  "cwe": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
  "epss": 0.00253,
  "epssPercentile": 0.16918,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58055",
  "fixes": [
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "Fedora 43",
      "fixedVersion": "1.66.0-3.fc43",
      "fix": "FEDORA-2026-91DD0C29D6",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-91dd0c29d6",
      "released": "2026-08-07T11:44:43Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "RHEL 8",
      "fixedVersion": "0:1.33.0-6.el8_10.3",
      "fix": "RHSA-2026:55804",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-55804",
      "released": "2026-08-19T23:17:39Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "RHEL 9",
      "fixedVersion": "0:1.43.0-6.el9_8.2",
      "fix": "RHSA-2026:54662",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-54662",
      "released": "2026-08-14T22:31:40Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "almalinux 10",
      "fixedVersion": "1.68.0-3.el10_2.2",
      "fix": "ALSA-2026:54650",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-54650",
      "released": "2026-08-13T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "almalinux 8",
      "fixedVersion": "1.33.0-6.el8_10.3",
      "fix": "ALSA-2026:55804",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-55804",
      "released": "2026-08-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "almalinux 9",
      "fixedVersion": "1.43.0-6.el9_8.2",
      "fix": "ALSA-2026:54662",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-54662",
      "released": "2026-08-13T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "ol 10",
      "fixedVersion": "0:1.68.0-3.el10_2.2",
      "fix": "ELSA-2026-54650",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-54650",
      "released": "2026-08-13T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "ol 8",
      "fixedVersion": "0:1.33.0-6.el8_10.3",
      "fix": "ELSA-2026-55804",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-55804",
      "released": "2026-08-18T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2",
      "release": "ol 9",
      "fixedVersion": "0:1.43.0-6.el9_8.2",
      "fix": "ELSA-2026-54662",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-54662",
      "released": "2026-08-13T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2-14",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.43.0-1ubuntu0.4",
      "fix": "libnghttp2-14 1.43.0-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnghttp2-14-1.43.0-1ubuntu0.4",
      "released": "2026-07-03T14:54:52Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2-14",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.59.0-1ubuntu0.4",
      "fix": "libnghttp2-14 1.59.0-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libnghttp2-14-1.59.0-1ubuntu0.4",
      "released": "2026-07-03T14:54:55Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2-14",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.64.0-1.1ubuntu1.2",
      "fix": "libnghttp2-14 1.64.0-1.1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libnghttp2-14-1.64.0-1.1ubuntu1.2",
      "released": "2026-07-03T14:54:58Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2-14",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
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      "fix": "libnghttp2-14 1.68.0-2ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libnghttp2-14-1.68.0-2ubuntu0.2",
      "released": "2026-06-27T19:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2-debuginfo",
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      "fixedVersion": "1.66.0-3.fc43",
      "fix": "FEDORA-2026-91DD0C29D6",
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      "released": "2026-08-07T11:44:43Z"
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      "platform": "linux",
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      "release": "RHEL 8",
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      "fix": "RHSA-2026:55804",
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      "released": "2026-08-19T23:17:39Z"
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    {
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      "fix": "RHSA-2026:54662",
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      "released": "2026-08-14T22:31:40Z"
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    {
      "platform": "linux",
      "product": "libnghttp2-devel",
      "release": "almalinux 10",
      "fixedVersion": "1.68.0-3.el10_2.2",
      "fix": "ALSA-2026:54650",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-54650",
      "released": "2026-08-13T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnghttp2-devel",
      "release": "almalinux 8",
      "fixedVersion": "1.33.0-6.el8_10.3",
      "fix": "ALSA-2026:55804",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-55804",
      "released": "2026-08-17T00:00:00Z"
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    {
      "platform": "linux",
      "product": "libnghttp2-devel",
      "release": "almalinux 9",
      "fixedVersion": "1.43.0-6.el9_8.2",
      "fix": "ALSA-2026:54662",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-54662",
      "released": "2026-08-13T00:00:00Z"
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    {
      "platform": "linux",
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      "fix": "ELSA-2026-54650",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-54650",
      "released": "2026-08-13T00:00:00Z"
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    {
      "platform": "linux",
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      "fix": "ELSA-2026-55804",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-55804",
      "released": "2026-08-18T00:00:00Z"
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      "fix": "ELSA-2026-54662",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-54662",
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      "fix": "DEBIAN-CVE-2026-58055",
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    {
      "platform": "linux",
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    {
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    {
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      "product": "nghttp2",
      "release": "Ubuntu 25.10 (questing)",
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      "product": "nghttp2",
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    {
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    {
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      "released": "2026-08-14T12:06:50Z"
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      "fix": "RLSA-2026:55804",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-55804",
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    {
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-nghttp2-proxy-1.43.0-1ubuntu0.4",
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    },
    {
      "platform": "linux",
      "product": "nghttp2-proxy",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "fix": "nghttp2-proxy 1.59.0-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-nghttp2-proxy-1.59.0-1ubuntu0.4",
      "released": "2026-07-03T14:54:55Z"
    },
    {
      "platform": "linux",
      "product": "nghttp2-proxy",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.64.0-1.1ubuntu1.2",
      "fix": "nghttp2-proxy 1.64.0-1.1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-nghttp2-proxy-1.64.0-1.1ubuntu1.2",
      "released": "2026-07-03T14:54:58Z"
    },
    {
      "platform": "linux",
      "product": "nghttp2-proxy",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.68.0-2ubuntu0.2",
      "fix": "nghttp2-proxy 1.68.0-2ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-nghttp2-proxy-1.68.0-2ubuntu0.2",
      "released": "2026-06-27T19:16:00Z"
    },
    {
      "platform": "linux",
      "product": "nghttp2-server",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.43.0-1ubuntu0.4",
      "fix": "nghttp2-server 1.43.0-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-nghttp2-server-1.43.0-1ubuntu0.4",
      "released": "2026-07-03T14:54:52Z"
    },
    {
      "platform": "linux",
      "product": "nghttp2-server",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.59.0-1ubuntu0.4",
      "fix": "nghttp2-server 1.59.0-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-nghttp2-server-1.59.0-1ubuntu0.4",
      "released": "2026-07-03T14:54:55Z"
    },
    {
      "platform": "linux",
      "product": "nghttp2-server",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.64.0-1.1ubuntu1.2",
      "fix": "nghttp2-server 1.64.0-1.1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-nghttp2-server-1.64.0-1.1ubuntu1.2",
      "released": "2026-07-03T14:54:58Z"
    },
    {
      "platform": "linux",
      "product": "nghttp2-server",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.68.0-2ubuntu0.2",
      "fix": "nghttp2-server 1.68.0-2ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-nghttp2-server-1.68.0-2ubuntu0.2",
      "released": "2026-06-27T19:16:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}