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Related vulnerabilities

GHSA-MGF9-4VPG-HJ56

Vulnerability from github – Published: 2026-06-15 20:19 – Updated: 2026-06-15 20:19
VLAI
Summary
tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)
Details

Tornado's gzip decompression routines work in limited-size chunks, but have no overall limit for the total size of decompressed chunks that they will accumulate (There has always been a limit for the total compressed size). This allows a malicious server to consume effectively unlimited amounts of memory if it is accessed via SimpleAsyncHTTPClient in its default configuration. HTTPServer is not affected in its default configuration, but it is if decompress_request=True is set.

This bug is fixed in Tornado 6.5.6. max_body_size is now checked both for the compressed and cumulative decompressed size of the response.

Prior to upgrading, this issue can be mitigated by setting decompress_response=False or using CurlAsyncHTTPClient.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "tornado"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.5.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49855"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-409"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-15T20:19:28Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Tornado\u0027s gzip decompression routines work in limited-size chunks, but have no overall limit for the total size of decompressed chunks that they will accumulate (There has always been a limit for the total *compressed* size). This allows a malicious server to consume effectively unlimited amounts of memory if it is accessed via SimpleAsyncHTTPClient in its default configuration. `HTTPServer` is not affected in its default configuration, but it is if `decompress_request=True` is set.\n\nThis bug is fixed in Tornado 6.5.6. `max_body_size` is now checked both for the compressed and cumulative decompressed size of the response.\n\nPrior to upgrading, this issue can be mitigated by setting `decompress_response=False` or using `CurlAsyncHTTPClient`.",
  "id": "GHSA-mgf9-4vpg-hj56",
  "modified": "2026-06-15T20:19:28Z",
  "published": "2026-06-15T20:19:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tornadoweb/tornado"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)"
}

OPENSUSE-SU-2026:11027-1

Vulnerability from csaf_opensuse - Published: 2026-06-13 00:00 - Updated: 2026-06-13 00:00
Summary
python311-tornado6-6.5.7-1.1 on GA media
Severity
Moderate
Notes
Title of the patch: python311-tornado6-6.5.7-1.1 on GA media
Description of the patch: These are all security issues fixed in the python311-tornado6-6.5.7-1.1 package on the GA media of openSUSE Tumbleweed.
Patchnames: openSUSE-Tumbleweed-2026-11027
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Threats
Impact moderate
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Threats
Impact moderate
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x
Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64
Vendor Fix
Threats
Impact moderate

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