CVE-2026-25896

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 62% 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, secondary
Trending — 3 sources updated this weekElevated
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, ", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
73(Attend)
EG Risk 73/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

February 20, 2026

Last Modified

August 20, 2026

Advisory Details (10)

Auto-updated Aug 1, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

v5.3.5

Patch available: NaturalIntelligence/fast-xml-parser v5.3.5

https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.5
github_commit Patch Available

commit ddcd0acf26dd (NaturalIntelligence/fast-xml-parser)

Patch available: NaturalIntelligence/fast-xml-parser v5.3.5 (contains commit ddcd0acf26dd)

https://github.com/NaturalIntelligence/fast-xml-parser/commit/ddcd0acf26ddd682cb0dc15a2bd6aa3b96bb1e69
github_commit Patch Available

commit 943ef0eb1b2d (NaturalIntelligence/fast-xml-parser)

Patch available: NaturalIntelligence/fast-xml-parser v5.3.5 (contains commit 943ef0eb1b2d)

https://github.com/NaturalIntelligence/fast-xml-parser/commit/943ef0eb1b2d3284e72dd74f44a042ee9f07026e
github Patch Available🟡 PoC Available

Entity encoding bypass via regex injection in DOCTYPE entity names · Advisory · NaturalIntelligence/fast-xml-parser · GitHub

https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-m7jm-9gc2-mpf2
redhat

2441501 – (CVE-2026-25896) CVE-2026-25896 fast-xml-parser: fast-xml-parser: Cross-Site Scripting (XSS) due to improper DOCTYPE entity handling

https://bugzilla.redhat.com/show_bug.cgi?id=2441501
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-25896
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:7128
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:7110
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:6802
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:6174

Vendor Advisories for CVE-2026-25896(8)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatsatellite/iop-host-inventory-frontend-rhel9:17859227642026-08-06redhat
redhatodf4/rook-ceph-rhel9-operator:17836775332026-07-20redhat
redhatodf4/rook-ceph-rhel9-operator:17836853752026-07-20redhat
redhatodf4/rook-ceph-rhel9-operator:17836692192026-07-16redhat
redhatadvanced-cluster-security/rhacs-main-rhel8:17755941192026-04-08redhat
redhatadvanced-cluster-security/rhacs-main-rhel8:17755942842026-04-08redhat
redhatrhdh/rhdh-hub-rhel9:17751406472026-04-07redhat
redhatrhdh/rhdh-hub-rhel9:17745456052026-03-30redhat

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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-webfont11.4.0+dfsg2+~cs35.7.26-10 ... 11.4.0+dfsg2+~cs35.7.26-9 (13 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-webfont11.4.0+dfsg2+~cs35.7.26-13 ... 11.4.0+dfsg2+~cs35.7.26-20 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-webfont11.4.0+dfsg2+~cs35.7.26-13 ... 11.4.0+dfsg2+~cs35.7.26-20 (7 versions)——
npm(1)
PackageVulnerable rangeFixed inDependents
fast-xml-parser—4.5.4—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 91× 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 133 total refreshes for this CVE.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 13:59 UTCEG score recompute
  3. 2026-08-20 13:59 UTCVendor advisory
  4. 2026-08-20 12:46 UTCEG score recompute
  5. 2026-08-20 12:46 UTCVendor advisory
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 12:12 UTCEG score recompute
  8. 2026-08-19 12:12 UTCVendor advisory
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 12:23 UTCEG score recompute
  11. 2026-08-18 12:23 UTCVendor advisory
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 12:22 UTCEG score recompute
  14. 2026-08-17 12:22 UTCVendor advisory
  15. 2026-08-17 12:14 UTCEG score recompute
  16. 2026-08-17 12:14 UTCVendor advisory
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-15 01:18 UTCVendor advisory
  21. 2026-08-14 21:35 UTCVendor advisory
  22. 2026-08-14 13:28 UTCEG score recompute
  23. 2026-08-14 13:28 UTCVendor advisory
  24. 2026-08-14 12:30 UTCEG score recompute
  25. 2026-08-14 12:30 UTCVendor advisory
Show 75 more
  1. 2026-08-14 09:20 UTCEG score recompute
  2. 2026-08-14 09:20 UTCVendor advisory
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 01:24 UTCEG score recompute
  5. 2026-08-13 01:24 UTCVendor advisory
  6. 2026-08-12 13:50 UTCEPSS rescore
  7. 2026-08-12 12:39 UTCEG score recompute
  8. 2026-08-12 12:39 UTCVendor advisory
  9. 2026-08-12 12:14 UTCEG score recompute
  10. 2026-08-12 12:14 UTCVendor advisory
  11. 2026-08-12 01:34 UTCEG score recompute
  12. 2026-08-12 01:34 UTCVendor advisory
  13. 2026-08-11 13:42 UTCEPSS rescore
  14. 2026-08-11 06:51 UTCEG score recompute
  15. 2026-08-11 06:51 UTCVendor advisory
  16. 2026-08-11 00:00 UTCEPSS rescore
  17. 2026-08-10 13:22 UTCEG score recompute
  18. 2026-08-10 13:22 UTCVendor advisory
  19. 2026-08-10 12:27 UTCEG score recompute
  20. 2026-08-10 12:27 UTCVendor advisory
  21. 2026-08-10 09:19 UTCVendor advisory
  22. 2026-08-10 01:17 UTCVendor advisory
  23. 2026-08-09 21:35 UTCVendor advisory
  24. 2026-08-09 17:51 UTCVendor advisory
  25. 2026-08-09 13:55 UTCEG score recompute
  26. 2026-08-09 13:55 UTCVendor advisory
  27. 2026-08-09 13:46 UTCEPSS rescore
  28. 2026-08-09 08:58 UTCEG score recompute
  29. 2026-08-09 08:58 UTCVendor advisory
  30. 2026-08-08 16:37 UTCEPSS rescore
  31. 2026-08-08 08:17 UTCVendor advisory
  32. 2026-08-08 04:34 UTCVendor advisory
  33. 2026-08-08 00:51 UTCVendor advisory
  34. 2026-08-07 21:07 UTCEG score recompute
  35. 2026-08-07 21:07 UTCVendor advisory
  36. 2026-08-07 12:26 UTCEG score recompute
  37. 2026-08-07 12:26 UTCVendor advisory
  38. 2026-08-07 12:09 UTCEG score recompute
  39. 2026-08-07 12:09 UTCVendor advisory
  40. 2026-08-06 13:46 UTCEPSS rescore
  41. 2026-08-06 07:00 UTCVendor advisory
  42. 2026-08-06 03:17 UTCEG score recompute
  43. 2026-08-06 03:17 UTCVendor advisory
  44. 2026-08-05 19:17 UTCEPSS rescore
  45. 2026-08-04 15:10 UTCEPSS rescore
  46. 2026-08-03 12:50 UTCEG score recompute
  47. 2026-08-03 12:50 UTCVendor advisory
  48. 2026-08-03 10:36 UTCEPSS rescore
  49. 2026-08-02 23:37 UTCVendor advisory
  50. 2026-08-02 19:54 UTCEG score recompute
  51. 2026-08-02 19:54 UTCVendor advisory
  52. 2026-08-02 02:26 UTCEPSS rescore
  53. 2026-08-01 04:16 UTCEPSS rescore
  54. 2026-07-30 16:27 UTCEPSS rescore
  55. 2026-07-30 01:30 UTCEPSS rescore
  56. 2026-07-28 15:36 UTCEPSS rescore
  57. 2026-07-27 12:41 UTCEG score recompute
  58. 2026-07-27 12:41 UTCVendor advisory
  59. 2026-07-26 14:54 UTCEPSS rescore
  60. 2026-07-26 14:54 UTCEPSS rescore
  61. 2026-07-25 14:18 UTCEPSS rescore
  62. 2026-07-25 14:17 UTCEPSS rescore
  63. 2026-07-24 14:17 UTCEPSS rescore
  64. 2026-07-23 14:18 UTCEPSS rescore
  65. 2026-07-23 14:18 UTCEPSS rescore
  66. 2026-07-23 03:07 UTCEG score recompute
  67. 2026-07-22 14:08 UTCEPSS rescore
  68. 2026-07-22 14:08 UTCEPSS rescore
  69. 2026-07-21 15:24 UTCEPSS rescore
  70. 2026-07-21 15:24 UTCEPSS rescore
  71. 2026-07-20 17:08 UTCEPSS rescore
  72. 2026-07-19 14:31 UTCEPSS rescore
  73. 2026-07-19 14:31 UTCEPSS rescore
  74. 2026-07-19 02:29 UTCEPSS rescore
  75. 2026-07-19 02:28 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-25896?
CVE-2026-25896 is a critical vulnerability published on February 20, 2026. 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. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow…
When was CVE-2026-25896 disclosed?
CVE-2026-25896 was first published in the National Vulnerability Database on February 20, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-25896 actively exploited?
CVE-2026-25896 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.6% of all scored CVEs.
What is the CVSS score of CVE-2026-25896?
CVE-2026-25896 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-25896?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-25896, 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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