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CVE-2026-49140

Nanobot prior to version 0.2.1 contains a denial of service vulnerability in the Matrix channel media download handler that allows authenticated room members to exhaust process memory and bandwidth by sending media events with missing or invalid size metadata. Attackers can send multiple concurrent Matrix media events with omitted or invalid declared sizes to trigger simultaneous large media downloads that fully materialize response bodies before post-download rejection, consuming process resour
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:77296bd71b141d3156ff38fbb9caa740da97a07ac7bcd248094773440cd7a684
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/HKUDS/nanobot","product":"nanobot","repo":"https://github.com/HKUDS/nanobot","vendor":"HKUDS","versions":[{"lessThan":"0.2.1","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["patch"],"url":"https://github.com/HKUDS/nanobot/commit/1d4000560dfff1acb83f5c5ca8ef3ab1f092bd14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/references/2
{"tags":["issue-tracking"],"url":"https://github.com/HKUDS/nanobot/pull/4106"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/HKUDS/nanobot/pull/4106"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/adp/0/references/0
{"tags":["release-notes"],"url":"https://github.com/HKUDS/nanobot/releases/tag/v0.2.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/nanobot-denial-of-service-via-matrix-media-download-handler"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8064e56d8caa7fadf0ebfabac0c49ad7768dbdfda1e56e99f785050d2958763d · sha256:9001ded4bb8daaad… · /containers/cna/references/3

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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