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CVE-2025-67726

Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b32d5761ed43addf62f6d1e18ad8af6cbc65c5c8f4f7b8db19295abd30b1ec6f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-834","description":"CWE-834: Excessive Iteration","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"tornado","vendor":"tornadoweb","versions":[{"status":"affected","version":"< 6.5.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /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:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-834","description":"CWE-834: Excessive Iteration","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cd","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /containers/cna/references/1
{"name":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.3","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /containers/cna/references/2
{"name":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-jhmp-mqwm-3gq8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-jhmp-mqwm-3gq8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:059cfac293a7fdc38a313d16b9694402bc52335fd062bdb0ea5c6e5deea8fd64 · sha256:1b954597ba9e3378… · /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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