CVE-2026-47729: squid Out-of-bounds Read — Fix

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.

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CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0195

Probability of exploitation

0.78%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

CWE-1289 CWE-1289

Affected Products

Vendor	Product	Versions
squid-cache	squid	< 7.6

References

Advisories & Patches

https://github.com/squid-cache/squid/commit/865a131c7d557e68c965043d98c2eccae26deef8 https://github.com/squid-cache/squid/pull/2408 https://github.com/squid-cache/squid/pull/2409 https://github.com/squid-cache/squid/security/advisories/GHSA-8c37-pxjq-qwrg

Other References

https://github.com/squid-cache/squid/releases/tag/SQUID_7_6

Frequently Asked Questions

What is CVE-2026-47729? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-47729? +

CVE-2026-47729 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0195, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-47729? +

CVE-2026-47729 affects products from squid-cache, specifically: squid. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-47729? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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