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CVE-2026-39804

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion when WebSocket permessage-deflate compression is enabled. 'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2 in lib/bandit/websocket/permessage_deflate.ex calls :zlib.inflate/2 with no output-size cap, then materializes the entire decompressed payload as a single binary via IO.iodata_to_binary/1. The websocket_options.max_frame_size option
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0920000b89ea5f639479fa84076f8c67e7e57d3d02197747e120f1554bf919d3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.WebSocket.PerMessageDeflate'"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/websocket/permessage_deflate.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"8156921a51e684a951221da7bc30a70a022f722e","status":"affected","version":"da4027cff7d2b80319e76fe7a…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.WebSocket.PerMessageDeflate'"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/websocket/permessage_deflate.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.11.0","status":"affected","version":"0.5.9","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.WebSocket.PerMessageDeflate'"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/websocket/permessage_deflate.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"8156921a51e684a951221da7bc30a70a022f722e","status":"affected","version":"da4027cff7d2b80319e76fe7a…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.WebSocket.PerMessageDeflate'"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/websocket/permessage_deflate.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.PerMessageDeflate':inflate/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.11.0","status":"affected","version":"0.5.9","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"CWE-770 Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-39804.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/mtrudel/bandit/commit/8156921a51e684a951221da7bc30a70a022f722e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-frh3-6pv6-rc8j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/adp/0/references/0
{"tags":["vendor-advisory","related"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-frh3-6pv6-rc8j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-39804"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:294706f4633ca9c85cb12a03200a768f604a1c3ea1825ba75fbe7b46f0b2289d · sha256:1b79076093fb8c22… · /containers/cna/references/2

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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