{
  "cveId": "CVE-2026-53583",
  "url": "https://patchblox.com/security/cve/CVE-2026-53583",
  "summary": "CVE-2026-53583 is fixed in 28 products on 1 platform, first by DEBIAN-CVE-2026-53583, released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Backend",
  "description": "libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, verify_server_cert in src/libgit2/streams/openssl.c uses an inverted !!memcmp result in the GEN_IPADD branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.",
  "published": "2026-08-17T09:00:00Z",
  "severity": "Moderate",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
  "cwe": "Improper Certificate Validation",
  "epss": 0.00238,
  "epssPercentile": 0.14947,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53583",
  "fixes": [
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      "released": "2026-08-17T09:00:00Z"
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      "product": "cargo-debuginfo",
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      "released": "2026-08-17T09:00:00Z"
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      "product": "clippy",
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      "released": "2026-08-17T09:00:00Z"
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    {
      "platform": "linux",
      "product": "libgit2",
      "release": "Debian 13.5 (trixie)",
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      "fix": "DEBIAN-CVE-2026-53583",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53583",
      "released": "2026-07-31T14:18:19Z"
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      "product": "libgit2",
      "release": "Debian 14",
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      "released": "2026-07-31T14:18:19Z"
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libgit2-1.7-1.7.2-ds-1ubuntu3.3",
      "released": "2026-08-20T12:16:00Z"
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}