CVE Database›CVE-2020-26154

CVE-2020-26154

libproxy: sending more than 102400 bytes in PAC without a Content-Length present could result in buffer overflow

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Severity

Moderate

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · July 16, 2020

Updated · March 18, 2026

Description

A vulnerability was found in libproxy, where a buffer overflow can occur if a server serving a PAC file sends more than 102400 bytes without a Content-Length header, this flaw allows an attacker to trigger an overflow of PAC_HTTP_BLOCK_SIZE (512 bytes), potentially leading to application crashes or unexpected behavior when processing large PAC files.

Statement

This vulnerability is rated as moderate because libproxy can overflow its buffer by PAC_HTTP_BLOCK_SIZE (512 bytes) if a server serving a PAC file sends more than 102400 bytes without a Content-Length header, specific conditions related to PAC file handling, and while it could lead to crashes or unexpected behavior, its overall impact is limited.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.5
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-121 · Stack-based Buffer Overflow