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CVE-2026-45186

35
FAUCET Score

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 published: May 10, 2026Last modified: May 11, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 2.8.1CPE matchmatch criteria
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
>= 0, < 2.8.1CPE match
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

2.9LOW

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.4
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
36.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 15th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: azl3 expat 2.6.4-6 on Azure Linux 3.0Fixed in: 2.8.2-1
microsoftpatch availablevia msrc
Product: 21279-17084Fixed in: 2.8.2-1

Vendor Advisories (1)

microsoft2026-May/CVE-2026-45186Low

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.

May 7, 2026

References

access.redhat.com / errata/RHSA-2026:22715
access.redhat.com / errata/RHSA-2026:22721
access.redhat.com / errata/RHSA-2026:23230
access.redhat.com / errata/RHSA-2026:26319
access.redhat.com / errata/RHSA-2026:27201
access.redhat.com / errata/RHSA-2026:29197
access.redhat.com / security/cve/CVE-2026-45186
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-45186.json
cert-portal.siemens.com / productcert/html/ssa-082556.html
openwall.com / lists/oss-security/2026/05/11/16
Mailing ListThird Party Advisory
github.com / libexpat/libexpat/pull/1216
ExploitIssue TrackingPatch