CVE Explorer

CVE-2026-49855

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, Tornado gzip decompression routines processed limited-size chunks but did not enforce an overall limit on accumulated decompressed chunks, allowing a malicious server accessed by SimpleAsyncHTTPClient or an HTTPServer configured with decompress_request=True to consume effectively unlimited memory. This issue is fixed in version 6.5.6.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:79d3aba8d3eb0fac5203f7fe247da6098932526e9ec0c9b0c055c75712d44031

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"tornado","vendor":"tornadoweb","versions":[{"status":"affected","version":"< 6.5.6"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:f6b887eb9c836e06704f7426e4384c4a412dac5dc0ebf255051374acc92daa62 · sha256:c900f87c3028d8e3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:f6b887eb9c836e06704f7426e4384c4a412dac5dc0ebf255051374acc92daa62 · sha256:c900f87c3028d8e3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:f6b887eb9c836e06704f7426e4384c4a412dac5dc0ebf255051374acc92daa62 · sha256:c900f87c3028d8e3… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/tornadoweb/tornado/commit/ff808b33adc52d89a549376a5e3628e92abbc8ff","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/commit/ff808b33adc52d89a549376a5e3628e92abbc8ff"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:f6b887eb9c836e06704f7426e4384c4a412dac5dc0ebf255051374acc92daa62 · sha256:c900f87c3028d8e3… · /containers/cna/references/2

{"name":"https://github.com/tornadoweb/tornado/pull/3626","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/pull/3626"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:f6b887eb9c836e06704f7426e4384c4a412dac5dc0ebf255051374acc92daa62 · sha256:c900f87c3028d8e3… · /containers/cna/references/1

{"name":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:f6b887eb9c836e06704f7426e4384c4a412dac5dc0ebf255051374acc92daa62 · sha256:c900f87c3028d8e3… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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