{
  "cveId": "CVE-2026-47734",
  "url": "https://patchblox.com/security/cve/CVE-2026-47734",
  "summary": "CVE-2026-47734 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-47734, released June 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "dulwich: Dulwich is a pure-Python implementation of the Git file formats and protocols",
  "description": "Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.1.0 and prior to version 1.2.5, a client with push access could push a tiny crafted thin pack (~174 bytes)  whose delta header declares a huge   dest_size. When dulwich ingested it via  add_thin_pack / apply_delta, it would  allocate hundreds of MB of memory based on that attacker-controlled size, with no relationship to the actual bytes received. Operators running a Dulwich-based Git server that exposes git-receive-pack (i.e. accepts pushes) - for example via dulwich.server functionality, the HTTP  smart server, or anything built on ReceivePackHandler - are impacted. The issue is patched in 1.2.5. add_thin_pack now accepts a max_input_size keyword (bytes; 0/None = unlimited, matching git\u0027s semantics), and ReceivePackHandler reads receive.maxInputSize from the repository config and passes it through. Wire reads are counted and a PackInputTooLarge exception is raised once the cap is exceeded - equivalent to git index-pack --max-input-size. Users should upgrade to Dulwich 1.2.5 or later and set receive.maxInputSize in their server\u0027s repository config to a sane bound for their environment. On unpatched versions, receive.maxInputSize has no effect, so it cannot be used as a workaround. Until upgrading, operators should restrict dulwich-receive-pack (push) access to trusted, authenticated clients only, or disable it entirely on servers that only need to serve fetches and/or run the server under an OS-level memory limit (e.g. ulimit, cgroups/MemoryMax, or a container memory limit) so a malicious push is killed rather than taking down the host.",
  "published": "2026-06-10T23:16:48Z",
  "severity": "medium",
  "cvss": 5.7,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H",
  "epss": 0.00188,
  "epssPercentile": 0.08477,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dulwich",
      "release": "Debian 14",
      "fixedVersion": "1.2.5-1",
      "fix": "DEBIAN-CVE-2026-47734",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-47734",
      "released": "2026-06-29T14:19:49Z"
    },
    {
      "platform": "linux",
      "product": "python-dulwich-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "0.20.18-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-2026",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2026",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python-dulwich-doc",
      "release": "amzn 2023",
      "fixedVersion": "0.20.18-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-2026",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2026",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-dulwich",
      "release": "amzn 2023",
      "fixedVersion": "0.20.18-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-2026",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2026",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-dulwich",
      "release": "sles 15.7",
      "fixedVersion": "0.20.24-150400.8.1",
      "fix": "SUSE-SU-2026:2984-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2984-1",
      "released": "2026-07-14T13:21:03Z"
    },
    {
      "platform": "linux",
      "product": "python3-dulwich-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "0.20.18-1.amzn2023.0.3",
      "fix": "ALAS2023-2026-2026",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2026",
      "released": "2026-08-03T09:00:00Z"
    }
  ],
  "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"
  }
}