In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00004.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
libexpat project libexpat unaffected
Version Status Constraints
0 affected < 2.8.1

No data.

No data.

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Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/libexpat/libexpat/pull/1216 cve-icon cve-icon
History

Mon, 11 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sun, 10 May 2026 07:45:00 +0000

Type Values Removed Values Added
Title Denial of Service via Attribute Name Collision in libexpat

Sun, 10 May 2026 06:45:00 +0000

Type Values Removed Values Added
Description In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
First Time appeared Libexpat Project
Libexpat Project libexpat
Weaknesses CWE-407
CPEs cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
Vendors & Products Libexpat Project
Libexpat Project libexpat
References
Metrics cvssV3_1

{'score': 2.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-11T22:23:27.385Z

Reserved: 2026-05-10T06:36:15.697Z

Link: CVE-2026-45186

cve-icon Vulnrichment

Updated: 2026-05-11T15:02:18.524Z

cve-icon NVD

Status : Received

Published: 2026-05-10T07:16:07.883

Modified: 2026-05-10T07:16:07.883

Link: CVE-2026-45186

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-10T08:00:07Z

Weaknesses