Is CVE-2026-56410 in the CISA KEV catalog?

No. CVE-2026-56410 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-56410?

CVE-2026-56410 has a CVSS v3 base score of 6.9 (Moderate).

What is the EPSS score for CVE-2026-56410?

CVE-2026-56410 has an EPSS score of 0.11% (2th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-56410?

Upgrade expat on debian unstable to 2.8.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-56410

MEDIUM

6.9

CVSS v3

NVD

Description

xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.

CWE-190Integer Overflow

How to fix

Remediation Available

expatDebian

Fixed in:2.8.2-1CVE-2026-56410

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

0.11%probability of exploitation in 30 days

2ndpercentile

Low risk: more likely to be exploited than 2% of all known CVEs.

References

Patch1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-23.