CVE-2023-34104

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 32% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

fast-xml-parser is an open source, pure javascript xml parser. fast-xml-parser allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for denial of service (DoS) attacks. By crafting an entity name that results in an intentionally bad performing regex and utilizing it in the entity replacement step of the parser, this can cause the parser to stall for an indefinite amount of time. This problem has been resolved in v4.2.4. Users are advised to upgrade. Users unable to upgrade should avoid using DOCTYPE parsing by setting the processEntities: false option.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
63.0%
KEV
Not listed

Published

June 6, 2023

Last Modified

March 9, 2026

References (6)

Vendor Advisories for CVE-2023-34104(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmta/mta-ui-rhel9:6.2.0-172023-08-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
fast-xml-parser—4.2.4—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 52× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-07-21 15:23 UTCEPSS rescore
  2. 2026-07-21 15:23 UTCEPSS rescore
  3. 2026-07-20 17:06 UTCEPSS rescore
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  10. 2026-07-16 17:01 UTCEPSS rescore
  11. 2026-07-15 18:23 UTCOSV refresh
  12. 2026-07-15 16:56 UTCEPSS rescore
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  1. 2026-07-07 13:44 UTCEPSS rescore
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  7. 2026-07-02 16:59 UTCEPSS rescore
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  9. 2026-06-30 23:21 UTCEPSS rescore
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  17. 2026-06-27 19:04 UTCOSV refresh
  18. 2026-06-27 03:07 UTCEPSS rescore
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  20. 2026-06-25 13:48 UTCEPSS rescore
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  24. 2026-06-23 21:31 UTCEPSS rescore
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  26. 2026-06-22 14:24 UTCEPSS rescore
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  28. 2026-06-21 14:55 UTCEPSS rescore
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  30. 2026-06-21 01:58 UTCEPSS rescore
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  32. 2026-06-19 19:24 UTCEPSS rescore
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  40. 2026-06-15 17:47 UTCEPSS rescore
  41. 2026-06-14 23:16 UTCEPSS rescore
  42. 2026-06-13 22:59 UTCEPSS rescore
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  44. 2026-06-12 23:10 UTCEPSS rescore
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  46. 2026-06-11 13:59 UTCEPSS rescore
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  48. 2026-06-10 22:17 UTCEPSS rescore
  49. 2026-06-10 13:21 UTCEPSS rescore
  50. 2026-06-10 05:47 UTCOSV refresh
  51. 2026-06-08 14:16 UTCEPSS rescore
  52. 2026-06-08 14:15 UTCEPSS rescore
  53. 2026-06-07 15:23 UTCEPSS rescore
  54. 2026-06-07 15:23 UTCEPSS rescore
  55. 2026-06-06 13:46 UTCEPSS rescore
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  71. 2026-05-29 13:43 UTCEPSS rescore
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  73. 2026-05-28 13:43 UTCEPSS rescore
  74. 2026-05-28 13:43 UTCEPSS rescore
  75. 2026-05-27 13:39 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-34104?
CVE-2023-34104 is a high vulnerability published on June 6, 2023. fast-xml-parser is an open source, pure javascript xml parser. fast-xml-parser allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for denial…
When was CVE-2023-34104 disclosed?
CVE-2023-34104 was first published in the National Vulnerability Database on June 6, 2023, with the most recent update on March 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-34104 actively exploited?
CVE-2023-34104 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-34104?
CVE-2023-34104 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-34104?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-34104, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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