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CVE-2026-49755

Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in wojtekmach Req allows attacker-controlled HTTP servers to exhaust memory in a Req client via decompression-bomb response bodies. Req's default response pipeline includes Req.Steps.decode_body/1 and Req.Steps.decompress_body/1 in lib/req/steps.ex. decode_body/1 dispatches on the server-supplied content-type (or URL extension) and calls :zip.extract(body, [:memory]) for application/zip, :erl_tar.extract({:binary, bo
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:105343c2a55240c622b4e55feb6a415041fd915d4056a6e0ffaa14e9e89f229d
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.Steps'"],"packageName":"wojtekmach/req","packageURL":"pkg:github/wojtekmach/req","product":"req","programFiles":["lib/req/steps.ex"],"programRoutines":[{"name":"'Elixir.Req.Steps':decode_body/1"},{"name":"'Elixir.Req.Steps':decompress_body/1"}],"repo":"https://github.com/wojtekmach/req.git","vendor":"wojtekmach","versions":[{"lessThan":"84977e5b1a83f26e749d55ad06e3625464af4e8d","status":"affected","version":"e37753741cbdc725e6aba3d977b380163bfc0ecb","ve…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:wojtekmach:req:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Req.Steps'"],"packageName":"req","packageURL":"pkg:hex/req","product":"req","programFiles":["lib/req/steps.ex"],"programRoutines":[{"name":"'Elixir.Req.Steps':decode_body/1"},{"name":"'Elixir.Req.Steps':decompress_body/1"}],"repo":"https://github.com/wojtekmach/req","vendor":"wojtekmach","versions":[{"lessThan":"0.6.1","status":"affected","version":"0.1.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /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.Steps'"],"packageName":"wojtekmach/req","packageURL":"pkg:github/wojtekmach/req","product":"req","programFiles":["lib/req/steps.ex"],"programRoutines":[{"name":"'Elixir.Req.Steps':decode_body/1"},{"name":"'Elixir.Req.Steps':decompress_body/1"}],"repo":"https://github.com/wojtekmach/req.git","vendor":"wojtekmach","versions":[{"lessThan":"84977e5b1a83f26e749d55ad06e3625464af4e8d","status":"affected","version":"e37753741cbdc725e6aba3d977b380163bfc0ecb","ve…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:wojtekmach:req:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Req.Steps'"],"packageName":"req","packageURL":"pkg:hex/req","product":"req","programFiles":["lib/req/steps.ex"],"programRoutines":[{"name":"'Elixir.Req.Steps':decode_body/1"},{"name":"'Elixir.Req.Steps':decompress_body/1"}],"repo":"https://github.com/wojtekmach/req","vendor":"wojtekmach","versions":[{"lessThan":"0.6.1","status":"affected","version":"0.1.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","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: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:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-409","description":"CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-49755.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/wojtekmach/req/commit/84977e5b1a83f26e749d55ad06e3625464af4e8d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/references/3
{"tags":["vendor-advisory","related"],"url":"https://github.com/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/wojtekmach/req/security/advisories/GHSA-655f-mp8p-96gv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /containers/adp/0/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-49755"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3f5be2fd5aef184ce11430131a8f7e63f6b84eaf4669077a43ef1b2507756e92 · sha256:5413b7bd83133e56… · /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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