NVD / CVE Program· CNA GitHub_M

CVE-2026-41205: Mako: Path traversal via double-slash URI prefix in TemplateLookup

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.36% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: sqlalchemy mako 1.3.11; azl3 python-mako 1.2.4-2 on Azure Linux 3.0 1.2.4-3; azl3 python-mako 1.2.4-3 on Azure Linux 3.0 1.2.4-3.

Low priority for now. Upgrade to sqlalchemy mako 1.3.11; azl3 python-mako 1.2.4-2 on Azure Linux 3.0 1.2.4-3; azl3 python-mako 1.2.4-3 on Azure Linux 3.0 1.2.4-3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Mako is a template library written in Python. Prior to 1.3.11, TemplateLookup.get_template() is vulnerable to path traversal when a URI starts with // (e.g., //../../../secret.txt). The root cause is an inconsistency between two slash-stripping implementations. Any file readable by the process can be returned as rendered template content when an application passes untrusted input directly to TemplateLookup.get_template(). This vulnerability is fixed in 1.3.11.

HighCVSS 7.7 · v4.0—No exploit Fix available

Published: Apr 23, 2026
Updated: Oct 26, 2026
EPSS: 0.3% · 29th percentile
CWE: CWE-22

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 7.7; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
sqlalchemy	mako	cpe:2.3:a:sqlalchemy:mako

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

sqlalchemy makobefore 1.3.11

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

sqlalchemy mako
- < 1.3.11affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	mako	from 0	—
openSUSE:Tumbleweed	python-Mako	before 1.3.11-1.1	1.3.11-1.1
PyPI	mako	before 1.3.11	1.3.11

Same product

sqlalchemy: all records

Other highest-scoring records for the same primary product.

CVE-2026-44307Mako: Path traversal via backslash URI on Windows in TemplateLookup
34Monitor
CVE-2022-40023Sqlalchemy mako before 1.2.2 is vulnerable to Regular expression Denial of Service when using the Lexer class to parse.
31Monitor
CVE-2026-102991Mako: Path traversal via drive-letter URI on Windows in TemplateLookup
26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
sqlalchemy mako	1.3.11 · description	Vendor (CNA)
azl3 python-mako 1.2.4-2 on Azure Linux 3.0	1.2.4-3 · CBL-Mariner Releases	Microsoft (MSRC)
azl3 python-mako 1.2.4-3 on Azure Linux 3.0	1.2.4-3 · CBL-Mariner Releases	Microsoft (MSRC)
cbl2 python-mako 1.2.2-2 on CBL-Mariner 2.0	Release Notes	Microsoft (MSRC)
opensuse:python-Mako	1.3.11-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
PyPI:mako	1.3.11	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

sqlalchemy/makocommit e05ac61

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-4430719 days apartMako: Path traversal via backslash URI on Windows in TemplateLookup
34Monitor
CVE-2026-102991160 days apartMako: Path traversal via drive-letter URI on Windows in TemplateLookup
26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: X

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:46 PM UTC

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References

github.com/sqlalchemy/mako/commit/e05ac61989a7fb9dd7dcde6cfd72dc48328719a3

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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