{
  "cveId": "CVE-2021-31826",
  "url": "https://patchblox.com/security/cve/CVE-2021-31826",
  "summary": "CVE-2021-31826 is fixed in 8 products on 1 platform, first by libapache2-mod-shib 3.0.4\u002Bdfsg1-1ubuntu0.2, released April 26, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libapache2-mod-shib: Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recove...",
  "description": "Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.",
  "published": "2021-04-26T21:15:00Z",
  "severity": "Medium",
  "epss": 0.02,
  "epssPercentile": 0.80896,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libapache2-mod-shib",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "libapache2-mod-shib 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libapache2-mod-shib-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libapache2-mod-shib2",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "libapache2-mod-shib2 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libapache2-mod-shib2-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libshibsp-plugins",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "libshibsp-plugins 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libshibsp-plugins-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libshibsp8",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "libshibsp8 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libshibsp8-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    },
    {
      "platform": "linux",
      "product": "shibboleth-sp-common",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "shibboleth-sp-common 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-shibboleth-sp-common-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    },
    {
      "platform": "linux",
      "product": "shibboleth-sp-utils",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "shibboleth-sp-utils 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-shibboleth-sp-utils-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    },
    {
      "platform": "linux",
      "product": "shibboleth-sp2-common",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "shibboleth-sp2-common 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-shibboleth-sp2-common-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    },
    {
      "platform": "linux",
      "product": "shibboleth-sp2-utils",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.0.4\u002Bdfsg1-1ubuntu0.2",
      "fix": "shibboleth-sp2-utils 3.0.4\u002Bdfsg1-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-shibboleth-sp2-utils-3.0.4-dfsg1-1ubuntu0.2",
      "released": "2021-04-26T21:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}