How severe is CVE-2026-44307?

CVE-2026-44307 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2026-44307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44307?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-44307 have an EU (EUVD) identifier?

Yes. CVE-2026-44307 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29867.

When was CVE-2026-44307 published?

CVE-2026-44307 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-44307

CVE-2026-44307 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. 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-22.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29867
Weakness: CWE-22
Published: 2026-05-12
Last modified: 2026-06-17

Description

Mako is a template library written in Python. Prior to 1.3.12, on Windows, a URI using backslash traversal (e.g. \..\..\ secret.txt) bypasses the directory traversal check in Template.__init__ and the posixpath-based normalization in TemplateLookup.get_template(), allowing reads of files outside the configured template directory. This vulnerability is fixed in 1.3.12.

Frequently asked questions

What is CVE-2026-44307?: Mako is a template library written in Python. Prior to 1.3.12, on Windows, a URI using backslash traversal (e.g. \..\..\ secret.txt) bypasses the directory traversal check in Template.__init__ and the posixpath-based normalization in TemplateLookup.get_template(), allowing reads of files outside the configured template directory. This vulnerability is fixed in 1.3.12.
How severe is CVE-2026-44307?: CVE-2026-44307 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2026-44307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44307?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-44307 have an EU (EUVD) identifier?: Yes. CVE-2026-44307 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29867.
When was CVE-2026-44307 published?: CVE-2026-44307 was published on 2026-05-12 and last updated on 2026-06-17.

References

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