Is CVE-2026-53538 actively exploited?

No active exploitation of CVE-2026-53538 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-53538 be exploited remotely?

Yes. CVE-2026-53538 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-53538?

CVE-2026-53538 has a CVSS score of 3.7 (LOW).

HOME VULNERABILITIESCVE-2026-53538

LOW

CVE-2026-53538

CWE-436Published: June 22, 2026· Updated: Jun 26, 2026

3.7

CVSS v3.1

EPSS:0.18%probability of exploitation in 30 daysPercentile:7.2th

Official Description

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ; as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL standard, modern browsers, and Python's urllib.parse (since the CVE-2021-23336 fix) treat only & as a separator. This creates a parser differential: the same bytes are tokenized into different fields than a WHATWG compliant intermediary would produce, allowing an attacker to smuggle extra form fields past an upstream body inspecting component. This vulnerability is fixed in 0.0.30.

NVD Source

Technical Analysis

CVE-2026-53538 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.