Is CVE-2026-25210 in the CISA KEV catalog?

No. CVE-2026-25210 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-25210?

CVE-2026-25210 has a CVSS v3 base score of 6.9 (MEDIUM).

What is the EPSS score for CVE-2026-25210?

CVE-2026-25210 has an EPSS score of 0.19% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25210?

Upgrade expat on debian unstable to 2.7.4-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2026-25210

MEDIUM

6.9

CVSS v3

NVD

Description

In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.

CWE-190Integer Overflow

How to fix

Remediation Available

expatDebian

Fixed in:2.7.4-1CVE-2026-25210

expatUbuntu

Fixed in:2.1.0-4ubuntu1.4+esm11USN-8022-1

Fixed in:2.1.0-7ubuntu0.16.04.5+esm11USN-8022-1

Fixed in:2.2.5-3ubuntu0.9+esm3USN-8022-1

Fixed in:2.2.9-1ubuntu0.8+esm1USN-8022-1

Fixed in:2.4.7-1ubuntu0.7USN-8022-1

Fixed in:2.6.1-2ubuntu0.4USN-8022-2

Fixed in:2.7.1-2ubuntu0.2USN-8022-1

lib64expat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4+esm11USN-8022-1

Fixed in:2.1.0-7ubuntu0.16.04.5+esm11USN-8022-1

libexpat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4+esm11USN-8022-1

Fixed in:2.1.0-7ubuntu0.16.04.5+esm11USN-8022-1

Fixed in:2.2.5-3ubuntu0.9+esm3USN-8022-1

Fixed in:2.2.9-1ubuntu0.8+esm1USN-8022-1

Fixed in:2.4.7-1ubuntu0.7USN-8022-1

Fixed in:2.6.1-2ubuntu0.4USN-8022-2

Fixed in:2.7.1-2ubuntu0.2USN-8022-1

libxmltokUbuntu

Fixed in:1.2-3ubuntu0.16.04.1~esm5USN-8023-1

Fixed in:1.2-4ubuntu0.18.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.20.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.22.04.1~esm6USN-8023-1

Fixed in:1.2-4.1ubuntu2.24.0.4.1+esm4USN-8023-1

libxmltok1Ubuntu

Fixed in:1.2-3ubuntu0.16.04.1~esm5USN-8023-1

Fixed in:1.2-4ubuntu0.18.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.20.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.22.04.1~esm6USN-8023-1

libxmltok1t64Ubuntu

Fixed in:1.2-4.1ubuntu2.24.0.4.1+esm4USN-8023-1

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

0.19%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Patch2

Other references1

cert-portal.siemens.com

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	90%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	Fix

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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 2026-06-02.