CVE-2026-35469: SpdyStream Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-pc3f-x583-g7j2",
  "modified" : "2026-06-08T23:36:28Z",
  "published" : "2026-04-16T20:44:01Z",
  "aliases" : [ "CVE-2026-35469" ],
  "summary" : "SpdyStream: DOS on CRI",
  "details" : "The SPDY/3 frame parser in spdystream does not validate\nattacker-controlled counts and lengths before allocating memory. A\nremote peer that can send SPDY frames to a service using spdystream can\ncause the process to allocate gigabytes of memory with a small number of\nmalformed control frames, leading to an out-of-memory crash.\n \nThree allocation paths in the receive side are affected:\n1. **SETTINGS entry count** -- The SETTINGS frame reader reads a 32-bit\n`numSettings` from the payload and allocates a slice of that size\nwithout checking it against the declared frame length. An attacker\ncan set `numSettings` to a value far exceeding the actual payload,\ntriggering a large allocation before any setting data is read.\n \n2. **Header count** -- `parseHeaderValueBlock` reads a 32-bit\n`numHeaders` from the decompressed header block and allocates an\n`http.Header` map of that size with no upper bound.\n \n3. **Header field size** -- Individual header name and value lengths are\nread as 32-bit integers and used directly as allocation sizes with\nno validation.\n \nBecause SPDY header blocks are zlib-compressed, a small on-the-wire\npayload can decompress into attacker-controlled bytes that the parser\ninterprets as 32-bit counts and lengths. A single crafted frame is\nenough to exhaust process memory.\n## Impact\n Any program that accepts SPDY connections using spdystream -- directly\nor through a dependent library -- is affected. A remote peer that can\nsend SPDY frames to the service can crash the process with a single\ncrafted SPDY control frame, causing denial of service.\n## Affected versions\n `github.com/moby/spdystream` <= v0.5.0\n## Fix\n v0.5.1 addresses the receive-side allocation bugs and adds related\nhardening:\n \n**Core fixes:**\n \n- **SETTINGS entry-count validation** -- The SETTINGS frame reader now\nchecks that `numSettings` is consistent with the declared frame\nlength (`numSettings <= (length-4)/8`) before allocating.\n \n- **Header count limit** -- `parseHeaderValueBlock` enforces a maximum\nnumber of headers per frame (default: 1000).\n \n- **Header field size limit** -- Individual header name and value\nlengths are checked against a per-field size limit (default: 1 MiB)\nbefore allocation.\n \n- **Connection closure on protocol error** -- The connection read loop\nnow closes the underlying `net.Conn` when it encounters an\n`InvalidControlFrame` error, preventing further exploitation on the\nsame connection.\n \n**Additional hardening:**\n \n- **Write-side bounds checks** -- All frame write methods now verify\nthat payloads fit within the 24-bit length field, preventing the\nlibrary from producing invalid frames.\n \n**Configurable limits:**\n \n- Callers can adjust the defaults using `NewConnectionWithOptions` or\nthe lower-level `spdy.NewFramerWithOptions` with functional options:\n`WithMaxControlFramePayloadSize`, `WithMaxHeaderFieldSize`, and\n`WithMaxHeaderCount`.\n ",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/moby/spdystream"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.5.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/moby/spdystream/security/advisories/GHSA-pc3f-x583-g7j2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35469"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moby/spdystream/commit/ef6121f62c730110bf5ae604a865a8613bfb787f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/moby/spdystream"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moby/spdystream/releases/tag/v0.5.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T20:44:01Z",
    "nvd_published_at" : "2026-04-16T22:16:37Z"
  }
}