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CVE-2026-53426

Allocation of Resources Without Limits or Throttling vulnerability in leandrocp MDEx allows Excessive Allocation. MDEx.parse_document/2 accepts a {:json, json} source. In lib/mdex.ex, the private json_to_node/1 function passes the attacker-controlled node_type value to Module.concat/1, which calls String.to_atom/1 and interns a brand-new atom for every distinct value. Atoms are never garbage collected on the BEAM, so a crafted JSON document carrying a unique node_type at each (deeply nested) no
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:34189b750b56d75164e94d3bd6c7119f05c731029bb10206b84e284c2b3ff6c3
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:leandrocp:mdex:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.MDEx'"],"packageName":"leandrocp/mdex","packageURL":"pkg:github/leandrocp/mdex","product":"mdex","programFiles":["lib/mdex.ex"],"programRoutines":[{"name":"'Elixir.MDEx':parse_document/2"},{"name":"'Elixir.MDEx':json_to_node/1"}],"repo":"https://github.com/leandrocp/mdex","vendor":"leandrocp","versions":[{"lessThan":"00fddf444220a1f1cc0af0a1cab6738804878387","status":"affected","version":"cbb59a3f792dbc343873adec3466f49c853dc309","versionType":"git"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.MDEx'"],"packageName":"mdex","packageURL":"pkg:hex/mdex","product":"mdex","programFiles":["lib/mdex.ex"],"programRoutines":[{"name":"'Elixir.MDEx':parse_document/2"},{"name":"'Elixir.MDEx':json_to_node/1"}],"repo":"https://github.com/leandrocp/mdex","vendor":"leandrocp","versions":[{"lessThan":"0.13.2","status":"affected","version":"0.4.3","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.MDEx'"],"packageName":"leandrocp/mdex","packageURL":"pkg:github/leandrocp/mdex","product":"mdex","programFiles":["lib/mdex.ex"],"programRoutines":[{"name":"'Elixir.MDEx':parse_document/2"},{"name":"'Elixir.MDEx':json_to_node/1"}],"repo":"https://github.com/leandrocp/mdex","vendor":"leandrocp","versions":[{"lessThan":"00fddf444220a1f1cc0af0a1cab6738804878387","status":"affected","version":"cbb59a3f792dbc343873adec3466f49c853dc309","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.MDEx'"],"packageName":"mdex","packageURL":"pkg:hex/mdex","product":"mdex","programFiles":["lib/mdex.ex"],"programRoutines":[{"name":"'Elixir.MDEx':parse_document/2"},{"name":"'Elixir.MDEx':json_to_node/1"}],"repo":"https://github.com/leandrocp/mdex","vendor":"leandrocp","versions":[{"lessThan":"0.13.2","status":"affected","version":"0.4.3","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /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:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-53426.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/leandrocp/mdex/commit/00fddf444220a1f1cc0af0a1cab6738804878387"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/references/3
{"tags":["vendor-advisory","related"],"url":"https://github.com/leandrocp/mdex/security/advisories/GHSA-923r-7vf4-5vw8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-53426"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d1b20029be76b1ee37d625d69af65d5c0f11eda5707bedf1f25033f0f08a5ac6 · sha256:70f6b9e865b3dbda… · /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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