How severe is CVE-2026-3463?

CVE-2026-3463 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-3463 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-2026-3463?

CVE-2026-3463 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3463?

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

Does CVE-2026-3463 have an EU (EUVD) identifier?

Yes. CVE-2026-3463 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9285.

When was CVE-2026-3463 published?

CVE-2026-3463 was published on 2026-03-03 and last updated on 2026-06-17.

CVE-2026-3463

CVE-2026-3463 is a low-severity vulnerability in Xlnt-community Xlnt with a CVSS 3.x base score of 3.3. 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-119.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v2: 1.7
CVSS v4: 1.9
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9285
Weakness: CWE-119
Affected product: Xlnt-community Xlnt
Published: 2026-03-03
Last modified: 2026-06-17

Description

A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::binary_writer::append of the file source/detail/binary.hpp of the component Compound Document Parser. This manipulation causes heap-based buffer overflow. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. Patch name: 147. It is suggested to install a patch to address this issue.

Frequently asked questions

What is CVE-2026-3463?: A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::binary_writer::append of the file source/detail/binary.hpp of the component Compound Document Parser. This manipulation causes heap-based buffer overflow. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. Patch name: 147. It is suggested to install a patch to address this issue.
How severe is CVE-2026-3463?: CVE-2026-3463 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-3463 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-2026-3463?: CVE-2026-3463 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3463?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3463 have an EU (EUVD) identifier?: Yes. CVE-2026-3463 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9285.
When was CVE-2026-3463 published?: CVE-2026-3463 was published on 2026-03-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xlnt-community:xlnt:*:*:*:*:*:*:*:*

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