How severe is CVE-2026-25210?

CVE-2026-25210 has a CVSS 3.x base score of 6.9, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-25210 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25210?

CVE-2026-25210 affects Libexpat Project Libexpat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25210?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25210 have an EU (EUVD) identifier?

Yes. CVE-2026-25210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5042.

When was CVE-2026-25210 published?

CVE-2026-25210 was published on 2026-01-30 and last updated on 2026-06-17.

CVE-2026-25210

CVE-2026-25210 is a medium-severity vulnerability in Libexpat Project Libexpat with a CVSS 3.x base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Medium (CVSS 3.x base score 6.9)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5042
Weakness: CWE-190
Affected product: Libexpat Project Libexpat
Published: 2026-01-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-25210?: 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.
How severe is CVE-2026-25210?: CVE-2026-25210 has a CVSS 3.x base score of 6.9, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-25210 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25210?: CVE-2026-25210 affects Libexpat Project Libexpat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25210?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25210 have an EU (EUVD) identifier?: Yes. CVE-2026-25210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5042.
When was CVE-2026-25210 published?: CVE-2026-25210 was published on 2026-01-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*

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