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CVE-2026-47729— Squid: Memory disclosure in FTP gateway

Quick assessment

Affected
squid-cache squid
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

squid-cache Squid是squid-cache团队开源的一套代理及Web缓存服务器软件。 squid-cache Squid 7.6之前版本存在安全漏洞，该漏洞源于FTP网关中对输入语法正确性验证不当，容易受到越界读取攻击，导致信任的客户端通过Squid的网关功能访问不当FTP服务器时，能够从随机无关事务中读取内存。

CVSS 6.5 · Medium EPSS 1.50% · P72

Possible ATT&CK Techniques 1 AI

T1014 · Rootkit

Affected Version Matrix 1

VendorProduct Version RangeStatus
squid-cache squid < 7.6 affected
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I. Basic Information for CVE-2026-47729

Vulnerability Information
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Vulnerability Title
Squid: Memory disclosure in FTP gateway
Source: CVE Program / CVE List V5
Vulnerability Description
Squid is a caching proxy for the Web. Prior to 7.6, due to an improper validation of syntactic correctness of input in the FTP gateway (src/clients/FtpGateway.cc), Squid is vulnerable to an out-of-bounds read: when a listing entry date in the TypeA or TypeB directory-listing formats is not followed by a filename, parsing was not restricted to the input buffer, so a trusted client accessing a misbehaving FTP server through Squid's gateway feature could read memory from random unrelated transactions. This issue is fixed in version 7.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
squid-cache Squid 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
squid-cache Squid是squid-cache团队开源的一套代理及Web缓存服务器软件。 squid-cache Squid 7.6之前版本存在安全漏洞，该漏洞源于FTP网关中对输入语法正确性验证不当，容易受到越界读取攻击，导致信任的客户端通过Squid的网关功能访问不当FTP服务器时，能够从随机无关事务中读取内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
squid-cache squid < 7.6 -

II. Public POCs for CVE-2026-47729

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III. Intelligence Information for CVE-2026-47729

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Patches & Fixes for CVE-2026-47729 (3)

Vendor Advisories for CVE-2026-47729 (1)

Vendor Pages for CVE-2026-47729 (1)

IV. Related Vulnerabilities

Same product: squid
Same vendor: squid-cache
Same weakness: CWE-125

V. Comments for CVE-2026-47729

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