8.7

CVE-2026-73569: naturalintelligence fast-xml-parser XML Entity Expansion

CVSS: 8.7v4.0HighDeferred
AliasesUBUNTU-CVE-2026-73569DEBIAN-CVE-2026-73569CGA-f299-cwfc-c4m3
Published 13-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-73569 is a high (CVSS 8.7) XML Entity Expansion vulnerability in naturalintelligence fast-xml-parser. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 41.9% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.51%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-PHJR-H27V-3H8H

Timeline

  1. 13-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration's entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.13 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.51%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard11 products
  • jitsucom-jitsu-console< 2.11.0-r30
  • kibana-9.0< 9.0.8-r34
  • kibana-9.0-bitnami< 9.0.8-r34
  • kibana-9.0-iamguarded< 9.0.8-r34
  • kibana-9.2< 9.2.8-r17
Wolfi2 products
  • jitsucom-jitsu-console< 2.11.0-r30
  • tileserver-gl< 5.6.0-r10
Debian1 product
  • node-webfontAll versions (No fix recorded)
Naturalintelligence1 product
Npm1 product
  • fast-xml-parser≥ 5.9.3, < 5.10.1
Ubuntu1 product
  • node-webfontAll versions (No fix recorded)

6 vendors · 17 products

References

9 links