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CVE-2026-39805

Inconsistent Interpretation of HTTP Requests vulnerability in mtrudel bandit allows HTTP request smuggling via duplicate Content-Length headers. 'Elixir.Bandit.Headers':get_content_length/1 in lib/bandit/headers.ex uses List.keyfind/3, which returns only the first matching header. When a request contains two Content-Length headers with different values, Bandit silently accepts it, uses the first value to read the body, and dispatches the remaining bytes as a second pipelined request on the same
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:609483c31c03ccd0010d70d3f00271eae08709d7ccc50d95622a0c8426040a2a
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.Headers'"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/headers.ex"],"programRoutines":[{"name":"'Elixir.Bandit.Headers':get_content_length/1"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"f2ca636eb6df385219957e8934e9fc6efa1630d1","status":"affected","version":"7bc8d97cd22697c299baa8012b7f419a7606a80c","versionType":"git"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.Headers'"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/headers.ex"],"programRoutines":[{"name":"'Elixir.Bandit.Headers':get_content_length/1"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.11.0","status":"affected","version":"0.1.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /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.Headers'"],"packageName":"mtrudel/bandit","packageURL":"pkg:github/mtrudel/bandit","product":"bandit","programFiles":["lib/bandit/headers.ex"],"programRoutines":[{"name":"'Elixir.Bandit.Headers':get_content_length/1"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"f2ca636eb6df385219957e8934e9fc6efa1630d1","status":"affected","version":"7bc8d97cd22697c299baa8012b7f419a7606a80c","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Bandit.Headers'"],"packageName":"bandit","packageURL":"pkg:hex/bandit","product":"bandit","programFiles":["lib/bandit/headers.ex"],"programRoutines":[{"name":"'Elixir.Bandit.Headers':get_content_length/1"}],"repo":"https://github.com/mtrudel/bandit","vendor":"mtrudel","versions":[{"lessThan":"1.11.0","status":"affected","version":"0.1.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","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:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-444","description":"CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-39805.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/mtrudel/bandit/commit/f2ca636eb6df385219957e8934e9fc6efa1630d1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-c67r-gc9j-2qf7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/adp/0/references/0
{"tags":["vendor-advisory","related"],"url":"https://github.com/mtrudel/bandit/security/advisories/GHSA-c67r-gc9j-2qf7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-39805"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74a44eca365c304caf9ca74cae99bfe18ebd88ff62955e064daf80e3c1828fc7 · sha256:86fa3d243f45a22c… · /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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