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CVE-2026-56811

Allocation of Resources Without Limits or Throttling vulnerability in phoenixframework phoenix (Phoenix.Socket module) allows an unauthenticated attacker to cause a denial of service against any endpoint that mounts a Phoenix socket with a reachable channel transport (WebSocket or LongPoll). This vulnerability is associated with program files lib/phoenix/socket.ex and program routine 'Elixir.Phoenix.Socket':handle_in/4. Phoenix transports do not limit the number of channels that a single trans
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:21f8a1c45e57786571f23b5c74e9ed900faf152dc8f1859b24184e226a536a34
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:phoenixframework:phoenix:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Phoenix.Socket'"],"packageName":"phoenix","packageURL":"pkg:hex/phoenix","product":"phoenix","programFiles":["lib/phoenix/socket.ex"],"programRoutines":[{"name":"'Elixir.Phoenix.Socket':handle_in/4"}],"repo":"https://github.com/phoenixframework/phoenix","vendor":"phoenixframework","versions":[{"lessThan":"1.5.15","status":"affected","version":"0.11.0","versionType":"semver"},{"lessThan":"1.6.17","status":"affected","version":"1.6.0-rc.0","version…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Phoenix.Socket'"],"packageName":"phoenixframework/phoenix","packageURL":"pkg:github/phoenixframework/phoenix","product":"phoenix","programFiles":["lib/phoenix/socket.ex"],"programRoutines":[{"name":"'Elixir.Phoenix.Socket':handle_in/4"}],"repo":"https://github.com/phoenixframework/phoenix","vendor":"phoenixframework","versions":[{"changes":[{"at":"c498ba8cf49f6accbbd0c643a5340b58db891218","status":"unaffected"},{"at":"d19ca0a8d9f82c130b7ed339b9f03…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Phoenix.Socket'"],"packageName":"phoenix","packageURL":"pkg:hex/phoenix","product":"phoenix","programFiles":["lib/phoenix/socket.ex"],"programRoutines":[{"name":"'Elixir.Phoenix.Socket':handle_in/4"}],"repo":"https://github.com/phoenixframework/phoenix","vendor":"phoenixframework","versions":[{"lessThan":"1.5.15","status":"affected","version":"0.11.0","versionType":"semver"},{"lessThan":"1.6.17","status":"affected","version":"1.6.0-rc.0","version…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:phoenixframework:phoenix:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Phoenix.Socket'"],"packageName":"phoenixframework/phoenix","packageURL":"pkg:github/phoenixframework/phoenix","product":"phoenix","programFiles":["lib/phoenix/socket.ex"],"programRoutines":[{"name":"'Elixir.Phoenix.Socket':handle_in/4"}],"repo":"https://github.com/phoenixframework/phoenix","vendor":"phoenixframework","versions":[{"changes":[{"at":"c498ba8cf49f6accbbd0c643a5340b58db891218","status":"unaffected"},{"at":"d19ca0a8d9f82c130b7ed339b9f03…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /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:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /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:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-56811.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/phoenixframework/phoenix/commit/16e295d2fccab185d1292322e2bee5d46c725c8a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/references/6
{"tags":["patch"],"url":"https://github.com/phoenixframework/phoenix/commit/a612100cd8a4279091abc1a2ef8fb98a6d01c0a1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/references/5
{"tags":["patch"],"url":"https://github.com/phoenixframework/phoenix/commit/c498ba8cf49f6accbbd0c643a5340b58db891218"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/references/3
{"tags":["patch"],"url":"https://github.com/phoenixframework/phoenix/commit/d19ca0a8d9f82c130b7ed339b9f033433e2dea5e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/references/4
{"tags":["vendor-advisory","related"],"url":"https://github.com/phoenixframework/phoenix/security/advisories/GHSA-6983-jfq8-485w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-56811"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d090cb659f3cf7667bf94c7f93d106115e81c29cd02b15a5defa8625ee6e1af9 · sha256:c97715b3eb45c95e… · /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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