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CVE-2026-49756

Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in wojtekmach Req allows multipart parameter smuggling via attacker-influenced part metadata. Req.Utils.encode_form_part/2 in lib/req/utils.ex builds the per-part headers by interpolating the caller-supplied name, filename, and content_type values directly into the content-disposition and content-type lines with no escaping or CRLF stripping. A value containing ", \r, or \n closes the surrounding quoted value and starts
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2e5a091bc7c070035c4a717ae3e50b810aaafb094acd12bf1edbec2e906c4222
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:wojtekmach:req:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Req.Utils'"],"packageName":"wojtekmach/req","packageURL":"pkg:github/wojtekmach/req","product":"req","programFiles":["lib/req/utils.ex"],"programRoutines":[{"name":"'Elixir.Req.Utils':encode_form_part/2"}],"repo":"https://github.com/wojtekmach/req.git","vendor":"wojtekmach","versions":[{"lessThan":"74506ff2c5addf74df85d79dc726e9b2e264a8ba","status":"affected","version":"60253dbe9436cb8e9c738f895032f2e87939b597","versionType":"git"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:wojtekmach:req:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Req.Utils'"],"packageName":"req","packageURL":"pkg:hex/req","product":"req","programFiles":["lib/req/utils.ex"],"programRoutines":[{"name":"'Elixir.Req.Utils':encode_form_part/2"}],"repo":"https://github.com/wojtekmach/req","vendor":"wojtekmach","versions":[{"lessThan":"0.6.0","status":"affected","version":"0.5.3","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:wojtekmach:req:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Req.Utils'"],"packageName":"wojtekmach/req","packageURL":"pkg:github/wojtekmach/req","product":"req","programFiles":["lib/req/utils.ex"],"programRoutines":[{"name":"'Elixir.Req.Utils':encode_form_part/2"}],"repo":"https://github.com/wojtekmach/req.git","vendor":"wojtekmach","versions":[{"lessThan":"74506ff2c5addf74df85d79dc726e9b2e264a8ba","status":"affected","version":"60253dbe9436cb8e9c738f895032f2e87939b597","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:wojtekmach:req:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Req.Utils'"],"packageName":"req","packageURL":"pkg:hex/req","product":"req","programFiles":["lib/req/utils.ex"],"programRoutines":[{"name":"'Elixir.Req.Utils':encode_form_part/2"}],"repo":"https://github.com/wojtekmach/req","vendor":"wojtekmach","versions":[{"lessThan":"0.6.0","status":"affected","version":"0.5.3","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":2.1,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-93","description":"CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-49756.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/wojtekmach/req/commit/74506ff2c5addf74df85d79dc726e9b2e264a8ba"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/references/3
{"tags":["vendor-advisory","related"],"url":"https://github.com/wojtekmach/req/security/advisories/GHSA-px9f-whj3-246m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/wojtekmach/req/security/advisories/GHSA-px9f-whj3-246m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /containers/adp/0/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-49756"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef3b6d070d71baf3fb9dcd856607e3cbcd92a1d271cf292f573210ef7ecab798 · sha256:fd78822dc650aa69… · /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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