CVE Explorer
CVE-2026-49854
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, the optional native extension tornado.speedups implemented websocket_mask without validating that the mask argument is exactly four bytes, allowing the C function to read up to three bytes beyond the provided buffer when reached through Tornado XSRF token decoding with the native extension active. This issue is fixed in version 6.5.6.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"tornado","vendor":"tornadoweb","versions":[{"status":"affected","version":"< 6.5.6"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:6163353e7beccf0ce95944535a6865494fe3c09e3384dd134fcf9eb5569d396f · sha256:3c4ef3077a406ba5… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:6163353e7beccf0ce95944535a6865494fe3c09e3384dd134fcf9eb5569d396f · sha256:3c4ef3077a406ba5… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-126","description":"CWE-126: Buffer Over-read","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:6163353e7beccf0ce95944535a6865494fe3c09e3384dd134fcf9eb5569d396f · sha256:3c4ef3077a406ba5… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/tornadoweb/tornado/commit/96dc88c2a05705287856b2cd6b4b4034f9a6aaac","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/commit/96dc88c2a05705287856b2cd6b4b4034f9a6aaac"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:6163353e7beccf0ce95944535a6865494fe3c09e3384dd134fcf9eb5569d396f · sha256:3c4ef3077a406ba5… · /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_v5referenceurn:baitaphish:normalized-source-record:v2:6163353e7beccf0ce95944535a6865494fe3c09e3384dd134fcf9eb5569d396f · sha256:3c4ef3077a406ba5… · /containers/cna/references/1
{"name":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.6","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.6"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:6163353e7beccf0ce95944535a6865494fe3c09e3384dd134fcf9eb5569d396f · sha256:3c4ef3077a406ba5… · /containers/cna/references/3
{"name":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-cx3h-4qpv-8hc9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-cx3h-4qpv-8hc9"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:6163353e7beccf0ce95944535a6865494fe3c09e3384dd134fcf9eb5569d396f · sha256:3c4ef3077a406ba5… · /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.