How severe is CVE-2026-3664?

CVE-2026-3664 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-2026-3664 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3664?

CVE-2026-3664 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3664?

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

Does CVE-2026-3664 have an EU (EUVD) identifier?

Yes. CVE-2026-3664 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10156.

When was CVE-2026-3664 published?

CVE-2026-3664 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-3664

CVE-2026-3664 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% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10156
Weakness: CWE-119
Affected product: Xlnt-community Xlnt
Published: 2026-03-07
Last modified: 2026-06-17

Description

A vulnerability was determined in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::compound_document::read_directory of the file source/detail/cryptography/compound_document.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to out-of-bounds read. The attack is restricted to local execution. The exploit has been publicly disclosed and may be utilized. This patch is called 147. Applying a patch is advised to resolve this issue.

Frequently asked questions

What is CVE-2026-3664?: A vulnerability was determined in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::compound_document::read_directory of the file source/detail/cryptography/compound_document.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to out-of-bounds read. The attack is restricted to local execution. The exploit has been publicly disclosed and may be utilized. This patch is called 147. Applying a patch is advised to resolve this issue.
How severe is CVE-2026-3664?: CVE-2026-3664 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-2026-3664 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3664?: CVE-2026-3664 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3664?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3664 have an EU (EUVD) identifier?: Yes. CVE-2026-3664 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10156.
When was CVE-2026-3664 published?: CVE-2026-3664 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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