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Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-66046

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.007

EPSS Ranking 53.3%

CVSS Severity

CVSS v3 Score 7.5

References

Products affected by CVE-2026-66046

Libexpat Project » Libexpat » Version: N/A

cpe:2.3:a:libexpat_project:libexpat:-
Libexpat Project » Libexpat » Version: 1.95.0

cpe:2.3:a:libexpat_project:libexpat:1.95.0
Libexpat Project » Libexpat » Version: 1.95.1

cpe:2.3:a:libexpat_project:libexpat:1.95.1
Libexpat Project » Libexpat » Version: 1.95.2

cpe:2.3:a:libexpat_project:libexpat:1.95.2
Libexpat Project » Libexpat » Version: 1.95.3

cpe:2.3:a:libexpat_project:libexpat:1.95.3
Libexpat Project » Libexpat » Version: 1.95.4

cpe:2.3:a:libexpat_project:libexpat:1.95.4
Libexpat Project » Libexpat » Version: 1.95.5

cpe:2.3:a:libexpat_project:libexpat:1.95.5
Libexpat Project » Libexpat » Version: 1.95.6

cpe:2.3:a:libexpat_project:libexpat:1.95.6
Libexpat Project » Libexpat » Version: 1.95.7

cpe:2.3:a:libexpat_project:libexpat:1.95.7
Libexpat Project » Libexpat » Version: 1.95.8

cpe:2.3:a:libexpat_project:libexpat:1.95.8
Libexpat Project » Libexpat » Version: 2.0.0

cpe:2.3:a:libexpat_project:libexpat:2.0.0
Libexpat Project » Libexpat » Version: 2.0.1

cpe:2.3:a:libexpat_project:libexpat:2.0.1
Libexpat Project » Libexpat » Version: 2.1.0

cpe:2.3:a:libexpat_project:libexpat:2.1.0
Libexpat Project » Libexpat » Version: 2.1.1

cpe:2.3:a:libexpat_project:libexpat:2.1.1
Libexpat Project » Libexpat » Version: 2.2.0

cpe:2.3:a:libexpat_project:libexpat:2.2.0
Libexpat Project » Libexpat » Version: 2.2.1

cpe:2.3:a:libexpat_project:libexpat:2.2.1
Libexpat Project » Libexpat » Version: 2.2.10

cpe:2.3:a:libexpat_project:libexpat:2.2.10
Libexpat Project » Libexpat » Version: 2.2.2

cpe:2.3:a:libexpat_project:libexpat:2.2.2
Libexpat Project » Libexpat » Version: 2.2.3

cpe:2.3:a:libexpat_project:libexpat:2.2.3
Libexpat Project » Libexpat » Version: 2.2.4

cpe:2.3:a:libexpat_project:libexpat:2.2.4
Libexpat Project » Libexpat » Version: 2.2.5

cpe:2.3:a:libexpat_project:libexpat:2.2.5
Libexpat Project » Libexpat » Version: 2.2.6

cpe:2.3:a:libexpat_project:libexpat:2.2.6
Libexpat Project » Libexpat » Version: 2.2.7

cpe:2.3:a:libexpat_project:libexpat:2.2.7
Libexpat Project » Libexpat » Version: 2.2.8

cpe:2.3:a:libexpat_project:libexpat:2.2.8
Libexpat Project » Libexpat » Version: 2.2.9

cpe:2.3:a:libexpat_project:libexpat:2.2.9
Libexpat Project » Libexpat » Version: 2.3.0

cpe:2.3:a:libexpat_project:libexpat:2.3.0
Libexpat Project » Libexpat » Version: 2.4.0

cpe:2.3:a:libexpat_project:libexpat:2.4.0
Libexpat Project » Libexpat » Version: 2.4.1

cpe:2.3:a:libexpat_project:libexpat:2.4.1
Libexpat Project » Libexpat » Version: 2.4.3

cpe:2.3:a:libexpat_project:libexpat:2.4.3
Libexpat Project » Libexpat » Version: 2.4.4

cpe:2.3:a:libexpat_project:libexpat:2.4.4
Libexpat Project » Libexpat » Version: 2.4.5

cpe:2.3:a:libexpat_project:libexpat:2.4.5
Libexpat Project » Libexpat » Version: 2.4.6

cpe:2.3:a:libexpat_project:libexpat:2.4.6
Libexpat Project » Libexpat » Version: 2.4.7

cpe:2.3:a:libexpat_project:libexpat:2.4.7
Libexpat Project » Libexpat » Version: 2.4.8

cpe:2.3:a:libexpat_project:libexpat:2.4.8
Libexpat Project » Libexpat » Version: 2.4.9

cpe:2.3:a:libexpat_project:libexpat:2.4.9
Libexpat Project » Libexpat » Version: 2.5.0

cpe:2.3:a:libexpat_project:libexpat:2.5.0
Libexpat Project » Libexpat » Version: 2.6.0

cpe:2.3:a:libexpat_project:libexpat:2.6.0
Libexpat Project » Libexpat » Version: 2.6.1

cpe:2.3:a:libexpat_project:libexpat:2.6.1
Libexpat Project » Libexpat » Version: 2.6.2

cpe:2.3:a:libexpat_project:libexpat:2.6.2
Libexpat Project » Libexpat » Version: 2.6.3

cpe:2.3:a:libexpat_project:libexpat:2.6.3
Libexpat Project » Libexpat » Version: 2.6.4

cpe:2.3:a:libexpat_project:libexpat:2.6.4
Libexpat Project » Libexpat » Version: 2.7.0

cpe:2.3:a:libexpat_project:libexpat:2.7.0
Libexpat Project » Libexpat » Version: 2.7.1

cpe:2.3:a:libexpat_project:libexpat:2.7.1
Libexpat Project » Libexpat » Version: 2.7.2

cpe:2.3:a:libexpat_project:libexpat:2.7.2
Libexpat Project » Libexpat » Version: 2.7.3

cpe:2.3:a:libexpat_project:libexpat:2.7.3
Libexpat Project » Libexpat » Version: 2.7.4

cpe:2.3:a:libexpat_project:libexpat:2.7.4
Libexpat Project » Libexpat » Version: 2.7.5

cpe:2.3:a:libexpat_project:libexpat:2.7.5
Libexpat Project » Libexpat » Version: 2.8.0

cpe:2.3:a:libexpat_project:libexpat:2.8.0
Libexpat Project » Libexpat » Version: 2.8.1

cpe:2.3:a:libexpat_project:libexpat:2.8.1
Libexpat Project » Libexpat » Version: 2.8.3

cpe:2.3:a:libexpat_project:libexpat:2.8.3

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-66046

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