PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-41080 libexpat project CVE debrief

CVE-2026-41080 is a vulnerability in libexpat, a popular XML parsing library. The issue arises from the library's use of insufficient entropy, making it vulnerable to hash flooding attacks via crafted XML documents. This CVE was published on 2026-04-16 and modified on 2026-06-12.

Vendor
libexpat project
Product
libexpat
CVSS
LOW 2.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-16
Original CVE updated
2026-07-14
Advisory published
2026-04-16
Advisory updated
2026-07-14

Who should care

Developers and administrators using libexpat versions before 2.8.0 should be aware of this vulnerability. Successful exploitation requires local access and specific conditions to be met, earning it a CVSS score of 2.9 (Low severity).

Technical summary

The vulnerability is caused by libexpat's inadequate entropy usage, which can lead to hash flooding. This issue is addressed in libexpat version 2.8.0. Users can refer to the release notes [ref-4] and patches [ref-6] for more information.

Defensive priority

Low

Recommended defensive actions

  • Update libexpat to version 2.8.0 or later.
  • Review and apply patches as available [ref-6].

Evidence notes

Evidence for this CVE comes from the NVD and CVE.org. The CVE was published on 2026-04-16 and last modified on 2026-06-12.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41080 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41080

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-41080 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41080

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.