Improper Input Validation Affecting litellm-1.82 package, versions <1.82.3-r1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.18% (8th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-LITELLM182-17741206
  • published1 Jul 2026
  • disclosed22 Jun 2026

Introduced: 22 Jun 2026

NewCVE-2026-53537  (opens in a new tab)
CWE-20  (opens in a new tab)
CWE-436  (opens in a new tab)

How to fix?

Upgrade Minimos:latest litellm-1.82 to version 1.82.3-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream litellm-1.82 package and not the litellm-1.82 package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, parse_options_header parsed Content-Disposition (and Content-Type) headers with email.message.Message, which transparently applies RFC 2231/5987 decoding. The extended parameter syntax (filename*=charset'lang'value, name*=..., and the filename0/filename1 continuation form) is decoded and surfaced under the bare filename/name key, and overrides the plain parameter when both are present. RFC 7578 §4.2 explicitly forbids the filename* form in multipart/form-data. Components that follow RFC 7578, or that do not implement RFC 2231/5987 decoding for multipart/form-data (WAFs, proxies, gateways), may interpret such a header differently. An attacker can exploit that difference to smuggle a different field name or filename past an upstream inspector to the backend. This vulnerability is fixed in 0.0.30.

CVSS Base Scores

version 3.1