Resource Exhaustion Affecting litellm package, versions <1.89.0-r2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CHAINGUARDLATEST-LITELLM-17376267
- published19 Jun 2026
- disclosed22 Jun 2026
Introduced: 19 Jun 2026
NewCVE-2026-53539 (opens in a new tab)How to fix?
Upgrade Chainguard litellm to version 1.89.0-r2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream litellm package and not the litellm package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, when parsing application/x-www-form-urlencoded bodies, QuerystringParser located the field separator with a two step lookup: it first scanned the entire remaining buffer for &, and only when no & existed anywhere ahead did it fall back to scanning for ;. For a body that uses ; as the separator and contains no &, every field iteration performed a full failed & scan over the entire remaining buffer before locating the nearby ;. With N semicolon separated fields in a chunk of size B, this yields O(B^2) byte comparisons per chunk. An attacker can submit a small crafted body of the form a;a;a;... and cause the parser to spend seconds of CPU per request. A handful of concurrent requests can exhaust worker processes. This vulnerability is fixed in 0.0.30.