How severe is CVE-2026-3663?

CVE-2026-3663 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-2026-3663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3663?

CVE-2026-3663 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3663?

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

Does CVE-2026-3663 have an EU (EUVD) identifier?

Yes. CVE-2026-3663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10155.

When was CVE-2026-3663 published?

CVE-2026-3663 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-3663

CVE-2026-3663 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% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10155
Weakness: CWE-119
Affected product: Xlnt-community Xlnt
Published: 2026-03-07
Last modified: 2026-06-17

Description

A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.

Frequently asked questions

What is CVE-2026-3663?: A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.
How severe is CVE-2026-3663?: CVE-2026-3663 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-2026-3663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3663?: CVE-2026-3663 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3663 have an EU (EUVD) identifier?: Yes. CVE-2026-3663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10155.
When was CVE-2026-3663 published?: CVE-2026-3663 was published on 2026-03-07 and last updated on 2026-06-17.

References

Affected products (1)

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

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