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GHSA-PC3F-X583-G7J2

Vulnerability from github – Published: 2026-04-16 20:44 – Updated: 2026-06-08 23:36
VLAI
Summary
SpdyStream: DOS on CRI
Details

The SPDY/3 frame parser in spdystream does not validate attacker-controlled counts and lengths before allocating memory. A remote peer that can send SPDY frames to a service using spdystream can cause the process to allocate gigabytes of memory with a small number of malformed control frames, leading to an out-of-memory crash.   Three allocation paths in the receive side are affected: 1. SETTINGS entry count -- The SETTINGS frame reader reads a 32-bit numSettings from the payload and allocates a slice of that size without checking it against the declared frame length. An attacker can set numSettings to a value far exceeding the actual payload, triggering a large allocation before any setting data is read.   2. Header count -- parseHeaderValueBlock reads a 32-bit numHeaders from the decompressed header block and allocates an http.Header map of that size with no upper bound.   3. Header field size -- Individual header name and value lengths are read as 32-bit integers and used directly as allocation sizes with no validation.   Because SPDY header blocks are zlib-compressed, a small on-the-wire payload can decompress into attacker-controlled bytes that the parser interprets as 32-bit counts and lengths. A single crafted frame is enough to exhaust process memory.

Impact

Any program that accepts SPDY connections using spdystream -- directly or through a dependent library -- is affected. A remote peer that can send SPDY frames to the service can crash the process with a single crafted SPDY control frame, causing denial of service.

Affected versions

github.com/moby/spdystream <= v0.5.0

Fix

v0.5.1 addresses the receive-side allocation bugs and adds related hardening:   Core fixes:   - SETTINGS entry-count validation -- The SETTINGS frame reader now checks that numSettings is consistent with the declared frame length (numSettings <= (length-4)/8) before allocating.   - Header count limit -- parseHeaderValueBlock enforces a maximum number of headers per frame (default: 1000).   - Header field size limit -- Individual header name and value lengths are checked against a per-field size limit (default: 1 MiB) before allocation.   - Connection closure on protocol error -- The connection read loop now closes the underlying net.Conn when it encounters an InvalidControlFrame error, preventing further exploitation on the same connection.   Additional hardening:   - Write-side bounds checks -- All frame write methods now verify that payloads fit within the 24-bit length field, preventing the library from producing invalid frames.   Configurable limits:   - Callers can adjust the defaults using NewConnectionWithOptions or the lower-level spdy.NewFramerWithOptions with functional options: WithMaxControlFramePayloadSize, WithMaxHeaderFieldSize, and WithMaxHeaderCount.  

Severity
8.7 (High)
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
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.5.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/moby/spdystream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35469"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T20:44:01Z",
    "nvd_published_at": "2026-04-16T22:16:37Z",
    "severity": "HIGH"
  },
  "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\u00a0\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\u00a0\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\u00a0\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\u00a0\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\u00a0Any 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\u00a0`github.com/moby/spdystream` \u003c= v0.5.0\n## Fix\n\u00a0v0.5.1 addresses the receive-side allocation bugs and adds related\nhardening:\n\u00a0\n**Core fixes:**\n\u00a0\n- **SETTINGS entry-count validation** -- The SETTINGS frame reader now\nchecks that `numSettings` is consistent with the declared frame\nlength (`numSettings \u003c= (length-4)/8`) before allocating.\n\u00a0\n- **Header count limit** -- `parseHeaderValueBlock` enforces a maximum\nnumber of headers per frame (default: 1000).\n\u00a0\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\u00a0\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\u00a0\n**Additional hardening:**\n\u00a0\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\u00a0\n**Configurable limits:**\n\u00a0\n- Callers can adjust the defaults using `NewConnectionWithOptions` or\nthe lower-level `spdy.NewFramerWithOptions` with functional options:\n`WithMaxControlFramePayloadSize`, `WithMaxHeaderFieldSize`, and\n`WithMaxHeaderCount`.\n\u00a0",
  "id": "GHSA-pc3f-x583-g7j2",
  "modified": "2026-06-08T23:36:28Z",
  "published": "2026-04-16T20:44:01Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "SpdyStream: DOS on CRI"
}



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