CVE-2026-44307

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 55% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.7
EG Score
8.7(medium)
EPSS
45.0%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 13, 2026

Advisory Details (4)

Auto-updated May 12, 2026
Patch available. Sources: github.
github Patch Available

Path traversal via backslash URI on Windows in TemplateLookup · Advisory · sqlalchemy/mako · GitHub

https://github.com/sqlalchemy/mako/security/advisories/GHSA-2h4p-vjrc-8xpq
generic

Release 1.3.12 · sqlalchemy/mako · GitHub

https://github.com/sqlalchemy/mako/releases/tag/rel_1_3_12
generic

backslash handling issue in template URI normalization on Windows · Issue #435 · sqlalchemy/mako · GitHub

https://github.com/sqlalchemy/mako/issues/435
generic

Fix path traversal via backslash URI on Windows in TemplateLookup · sqlalchemy/mako@72e10c5 · GitHub

https://github.com/sqlalchemy/mako/commit/72e10c573ca0fbcbddd4455abca8ce92a61780d7

Vendor Advisories for CVE-2026-44307(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
mako0.1.0 ... 1.3.9 (78 versions)1.3.12—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
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  74. 2026-05-21 22:43 UTCEPSS rescore
  75. 2026-05-20 22:38 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44307?
CVE-2026-44307 is a high vulnerability published on May 12, 2026. 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…
When was CVE-2026-44307 disclosed?
CVE-2026-44307 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44307 actively exploited?
CVE-2026-44307 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44307?
CVE-2026-44307 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-44307?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44307, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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