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CVE-2026-25128

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. In versions 5.0.9 through 5.3.3, a RangeError vulnerability exists in the numeric entity processing of fast-xml-parser when parsing XML with out-of-range entity code points (e.g., `�` or `�`). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input. Version 5.3.4 fixes the issu
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:337c2fdb9649981f101ebb67c81b1be3503fd6200d30a779ed1940c7561baff6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"fast-xml-parser","vendor":"NaturalIntelligence","versions":[{"status":"affected","version":">= 5.0.9, <= 5.3.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e387f61c4a5cef792f6a2f42467013290bf95dc","tags":["x_refsource_MISC"],"url":"https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e387f61c4a5cef792f6a2f42467013290bf95dc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/references/1
{"name":"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.4","tags":["x_refsource_MISC"],"url":"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/references/2
{"name":"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-37qj-frw5-hhjh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-37qj-frw5-hhjh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b764145308fbba34b91e5600352200ae3622871d5419ff92498c5299178d8781 · sha256:319b62ce1fb1f44f… · /containers/cna/references/0

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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