Out-of-bounds Read Affecting squid package, versions [,7.6)
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-UNMANAGED-SQUID-17660960
- published28 Jun 2026
- disclosed23 Jun 2026
- creditUnknown
Introduced: 23 Jun 2026
CVE-2026-47729 (opens in a new tab)How to fix?
Upgrade squid to version 7.6 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read in the FTP gateway process. An attacker can access sensitive memory contents from other transactions by controlling an FTP server and making authenticated requests through the proxy. This is only exploitable if the attacker has a valid account on the proxy and can reach a malicious FTP server from the proxy.
Workaround
This vulnerability can be mitigated by blocking FTP traffic at the proxy using specific configuration settings in the squid.conf file, or by restricting FTP access to trusted destination domains only.