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CVE-2026-24486

Fastapiexpert Python-multipart path traversal

8.6 HIGHPublic exploitEPSS 2.24%
  1. Published27 Jan 2026

Description

Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.

CVSS 3.1 breakdown

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

Affected products

Fastapiexpert Python-multipart< 0.0.22

Remediation

Fixed in
Fastapiexpert Python-multipart≥ 0.0.22

References

and 7 more references

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Frequently asked

Is CVE-2026-24486 being actively exploited?

CVE-2026-24486 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 2.24%.

How severe is CVE-2026-24486?

CVE-2026-24486 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 2.24% probability of exploitation.

Which products are affected by CVE-2026-24486?

Affected products include Fastapiexpert Python-multipart.

How do I fix CVE-2026-24486?

Upgrade affected software to a fixed version, for example Fastapiexpert Python-multipart 0.0.22 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-24486 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.