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CVE-2026-39847

Emmett path traversal

9.1 CRITICALEPSS 0.57%
  1. Published7 Apr 2026

Description

Emmett is a full-stack Python web framework designed with simplicity. From 2.5.0 to before 2.8.1, the RSGI static handler for Emmett's internal assets (/__emmett__ paths) is vulnerable to path traversal attacks. An attacker can use ../ sequences (eg /__emmett__/../rsgi/handlers.py) to read arbitrary files outside the assets directory. This vulnerability is fixed in 2.8.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Emmett≥ 2.5.0 < 2.8.1

Remediation

Fixed in
Emmett≥ 2.8.1

References

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Frequently asked

Is CVE-2026-39847 being actively exploited?

CVE-2026-39847 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.57%.

How severe is CVE-2026-39847?

CVE-2026-39847 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.57% probability of exploitation.

Which products are affected by CVE-2026-39847?

Affected products include Emmett.

How do I fix CVE-2026-39847?

Upgrade affected software to a fixed version, for example Emmett 2.8.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39847 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.