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CVE-2026-39803

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. The chunked clause of 'Elixir.Bandit.HTTP1.Socket':read_data/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when reading HTTP/1 chunked request bodies. Instead of capping the accumulated body at the configured limit (e.g. Plug.Parsers' default 8 MB), do_read_chunked_data!/5 buffers every received chunk into an iol
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:11475613c933686492ab475da4f4ffd1e8017eea937e92702ed366056b25e5e3
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.HTTP1.Socket'"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/http1/socket.ex"],"programRoutines":[{"name":"'Elixir.Bandit.HTTP1.Socket':read_data/2"},{"name":"'Elixir.Bandit.HTTP1.Socket':do_read_chunked_data!/5"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.11.1","status":"affected","version":"1.4.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.HTTP1.Socket'"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/http1/socket.ex"],"programRoutines":[{"name":"'Elixir.Bandit.HTTP1.Socket':read_data/2"},{"name":"'Elixir.Bandit.HTTP1.Socket':do_read_chunked_data!/5"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"ae3520dfdbfab115c638f8c7f6f6b805db34e1ab","status":"affected","version":"903e2…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /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.HTTP1.Socket'"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/http1/socket.ex"],"programRoutines":[{"name":"'Elixir.Bandit.HTTP1.Socket':read_data/2"},{"name":"'Elixir.Bandit.HTTP1.Socket':do_read_chunked_data!/5"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.11.1","status":"affected","version":"1.4.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.HTTP1.Socket'"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/http1/socket.ex"],"programRoutines":[{"name":"'Elixir.Bandit.HTTP1.Socket':read_data/2"},{"name":"'Elixir.Bandit.HTTP1.Socket':do_read_chunked_data!/5"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"ae3520dfdbfab115c638f8c7f6f6b805db34e1ab","status":"affected","version":"903e2…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /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:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /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:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-39803.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/mtrudel/bandit/commit/ae3520dfdbfab115c638f8c7f6f6b805db34e1ab"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /containers/cna/references/3
{"tags":["vendor-advisory","related"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-9q9q-324x-93r2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-9q9q-324x-93r2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /containers/adp/0/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-39803"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d597b126f77e42015ebb452bc8d1a5110611136cc876b13431da45a4006a283e · sha256:8b8274bd68524cd4… · /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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