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CVE-2026-32688

Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion. Plug.Cowboy.Conn.conn/1 in lib/plug/cowboy/conn.ex calls String.to_atom/1 on the value returned by :cowboy_req.scheme/1. For HTTP/2 connections, cowlib passes the client-supplied :scheme pseudo-header value through verbatim without validation. Each unique value permanently allocates a new entry in the BEAM atom table. Since atom
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:64750f431ae0853b3d8eb8bc26d8b9bb802195235b57a28c29eb016bd063630c
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:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Cowboy.Conn'"],"packageName":"plug_cowboy","packageURL":"pkg:hex/plug_cowboy","product":"plug_cowboy","programFiles":["lib/plug/cowboy/conn.ex"],"programRoutines":[{"name":"'Elixir.Plug.Cowboy.Conn':conn/1"}],"repo":"https://github.com/elixir-plug/plug_cowboy","vendor":"elixir-plug","versions":[{"lessThan":"2.8.1","status":"affected","version":"2.0.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Cowboy.Conn'"],"packageName":"elixir-plug/plug_cowboy","packageURL":"pkg:github/elixir-plug/plug_cowboy","product":"plug_cowboy","programFiles":["lib/plug/cowboy/conn.ex"],"programRoutines":[{"name":"'Elixir.Plug.Cowboy.Conn':conn/1"}],"repo":"https://github.com/elixir-plug/plug_cowboy","vendor":"elixir-plug","versions":[{"lessThan":"bfb34cb45eb354e56437f7023fb306de1bf9c19b","status":"affected","version":"12ecfd024bb179d48b018fecf074e43fe6a19c…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Cowboy.Conn'"],"packageName":"plug_cowboy","packageURL":"pkg:hex/plug_cowboy","product":"plug_cowboy","programFiles":["lib/plug/cowboy/conn.ex"],"programRoutines":[{"name":"'Elixir.Plug.Cowboy.Conn':conn/1"}],"repo":"https://github.com/elixir-plug/plug_cowboy","vendor":"elixir-plug","versions":[{"lessThan":"2.8.1","status":"affected","version":"2.0.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Plug.Cowboy.Conn'"],"packageName":"elixir-plug/plug_cowboy","packageURL":"pkg:github/elixir-plug/plug_cowboy","product":"plug_cowboy","programFiles":["lib/plug/cowboy/conn.ex"],"programRoutines":[{"name":"'Elixir.Plug.Cowboy.Conn':conn/1"}],"repo":"https://github.com/elixir-plug/plug_cowboy","vendor":"elixir-plug","versions":[{"lessThan":"bfb34cb45eb354e56437f7023fb306de1bf9c19b","status":"affected","version":"12ecfd024bb179d48b018fecf074e43fe6a19c…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /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:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /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:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-32688.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/elixir-plug/plug_cowboy/commit/bfb34cb45eb354e56437f7023fb306de1bf9c19b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /containers/cna/references/3
{"tags":["vendor-advisory","related"],"url":"https://github.com/elixir-plug/plug_cowboy/security/advisories/GHSA-q8x4-x7mp-5vg2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-32688"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:793579eed4041bf49a246f10955654426d4c7ed8f2838243af220e26e4fe8d03 · sha256:b1c35d1e2758929b… · /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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