{
  "cveId": "CVE-2026-49214",
  "url": "https://patchblox.com/security/cve/CVE-2026-49214",
  "summary": "CVE-2026-49214 is fixed in php-guzzlehttp-psr7 on 1 platform, first by DEBIAN-CVE-2026-49214, released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "php-guzzlehttp-psr7: guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP",
  "description": "guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Versions prior to 2.10.2 did not reject ASCII control characters, whitespace, or DEL in first-party URI host components. A vulnerable flow is: First, an application accepts a user-controlled URL. Second, the URL is used to construct a PSR-7 \u0060Uri\u0060 or \u0060Request\u0060. Third, the host component contains CRLF or another header-unsafe character. Fourth, the host is copied into the PSR-7 \u0060Host\u0060 header when no explicit \u0060Host\u0060 header is provided. Finally, the request is serialized or sent by an HTTP client that does not independently reject the malformed host. In that flow, an attacker can cause the serialized request to contain additional attacker-controlled header lines. For example, a host containing \u0060\u0022\\r\\nX-Injected: yes\u0022\u0060 can cause the generated \u0060Host\u0060 header to span multiple HTTP header lines. Applications are affected when they use user-controlled URLs for outbound HTTP requests, URL forwarding, proxying, crawling, webhook delivery, or similar request-dispatch flows. In deployments involving HTTP/1.1 connection reuse, proxies, gateways, or load balancers, this malformed request may also contribute to request smuggling or cache poisoning, depending on how downstream components parse the request. The issue is patched in \u00602.10.2\u0060 and later. \u00601.x\u0060 is end-of-life and will not receive a patch. As a workaround, validate and reject all untrusted URI strings before constructing PSR-7 \u0060Uri\u0060 or \u0060Request\u0060 instances. Reject input containing ASCII control characters, whitespace, or DEL, including CRLF, tab, space, NUL, or DEL characters. Applications that forward requests should also ensure the final HTTP client or serializer rejects invalid URI and header data before writing requests to the network.",
  "published": "2026-06-11T13:16:33Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "epss": 0.0019,
  "epssPercentile": 0.08655,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "php-guzzlehttp-psr7",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.4.5-1\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-49214",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-49214",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "php-guzzlehttp-psr7",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.7.1-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-49214",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-49214",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "php-guzzlehttp-psr7",
      "release": "Debian 14",
      "fixedVersion": "2.10.3-1",
      "fix": "DEBIAN-CVE-2026-49214",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-49214",
      "released": "2026-06-24T14:07:24Z"
    }
  ],
  "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"
  }
}