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CVE-2026-65623

Inefficient Algorithmic Complexity vulnerability in mtrudel bandit allows unauthenticated remote denial of service via CPU exhaustion during WebSocket fragment reassembly. The size guard 'Elixir.Bandit.WebSocket.Connection':oversize_message?/2 called from handle_frame/3 in lib/bandit/websocket/connection.ex appends each non-final continuation frame to a left-nested iolist and then re-measures the entire accumulated buffer with IO.iodata_length/1 on every frame. Because the buffer grows by one e
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fefd27c93dd6d46f520f9af6c819bc94f6e21920eebe5a5c27e6d97c5d7946ce
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://repo.hex.pm","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["Elixir.Bandit.WebSocket.Connection"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/websocket/connection.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.Connection':handle_frame/3"},{"name":"'Elixir.Bandit.WebSocket.Connection':oversize_message?/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.12.1","status":"affected","version":"1.11.0","versionType":"semve…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["Elixir.Bandit.WebSocket.Connection"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/websocket/connection.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.Connection':handle_frame/3"},{"name":"'Elixir.Bandit.WebSocket.Connection':oversize_message?/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"418ef7e906192a230ddba112f7a669c87b6b0e3a","status…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["Elixir.Bandit.WebSocket.Connection"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/websocket/connection.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.Connection':handle_frame/3"},{"name":"'Elixir.Bandit.WebSocket.Connection':oversize_message?/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.12.1","status":"affected","version":"1.11.0","versionType":"semve…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["Elixir.Bandit.WebSocket.Connection"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/websocket/connection.ex"],"programRoutines":[{"name":"'Elixir.Bandit.WebSocket.Connection':handle_frame/3"},{"name":"'Elixir.Bandit.WebSocket.Connection':oversize_message?/2"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"418ef7e906192a230ddba112f7a669c87b6b0e3a","status…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/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:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-407","description":"CWE-407 Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-65623.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/mtrudel/bandit/commit/418ef7e906192a230ddba112f7a669c87b6b0e3a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-vg8x-66vg-5pxh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/adp/0/references/0
{"tags":["vendor-advisory","related"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-vg8x-66vg-5pxh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-65623"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db65b673fac13478c2bd660f224658fe8b1dba6031bec2f91cecddfb0fd44db2 · sha256:527d453395e1ea6a… · /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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