Infinite loop in starlette - CVE-2025-62727

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Main Vulnerability Database Vulnerabilities #VU117790

Infinite loop in starlette - CVE-2025-62727

Published: October 29, 2025


Vulnerability identifier: #VU117790
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-62727
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
starlette
Software vendor:
Encode

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop. A remote attacker can send a specially crafted HTTP Range header that triggers quadratic-time processing in Starlette's FileResponse Range parsing/merging logic and cause denial of service conditions.


Remediation

Install updates from vendor's website.

External links