How severe is CVE-2026-24486?

CVE-2026-24486 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2026-24486 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24486?

CVE-2026-24486 affects Fastapiexpert Python-multipart. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24486?

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-2026-24486 have an EU (EUVD) identifier?

Yes. CVE-2026-24486 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4754.

When was CVE-2026-24486 published?

CVE-2026-24486 was published on 2026-01-27 and last updated on 2026-06-30.

CVE-2026-24486

CVE-2026-24486 is a high-severity vulnerability in Fastapiexpert Python-multipart with a CVSS 3.x base score of 8.6. 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 3.x base score 8.6)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4754
Weakness: CWE-22
Affected product: Fastapiexpert Python-multipart
Published: 2026-01-27
Last modified: 2026-06-30

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.

Frequently asked questions

What is CVE-2026-24486?: 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.
How severe is CVE-2026-24486?: CVE-2026-24486 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2026-24486 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24486?: CVE-2026-24486 affects Fastapiexpert Python-multipart. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24486?: 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-2026-24486 have an EU (EUVD) identifier?: Yes. CVE-2026-24486 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4754.
When was CVE-2026-24486 published?: CVE-2026-24486 was published on 2026-01-27 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:fastapiexpert:python-multipart:*:*:*:*:*:python:*:*

More vulnerabilities in Fastapiexpert Python-multipart

CVE-2026-53539 — High (CVSS 7.5): Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, when parsing…
CVE-2024-24762 — High (CVSS 7.5): `python-multipart` is a streaming multipart parser for Python. When using form data, `python-multipart` uses a Regular…
CVE-2026-40347 — Medium (CVSS 5.3): Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service…
CVE-2026-53540 — Low (CVSS 3.7): Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.31, parse_form() did not validate the…
CVE-2026-53538 — Low (CVSS 3.7): Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ; as a field…
CVE-2026-53537 — Low (CVSS 3.7): Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, parse_options_header parsed…

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