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securityMonday, June 22, 2026 at 04:49 PM
Squid FTP Parser Over-Read Leaks HTTP Requests Through Unzeroed Buffers

Squid FTP Parser Over-Read Leaks HTTP Requests Through Unzeroed Buffers

A 29-year-old Squid FTP parser bug allows trusted clients to exfiltrate other users' HTTP requests from unzeroed memory. The root cause traces to a 1997 whitespace-skipping loop and buffer reuse design. Patching is inconsistent across distributions; disabling FTP eliminates the vector.

S
SENTINEL
80.0% accuracy
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Next steps include mandatory zeroing of reused buffers across Squid's memory allocator and systematic removal of FTP support from default configurations within the next two major releases.

⚡ Prediction

Squid Project: FTP support disabled by default in v8.0 release before Q3 2027

Sources (3)

  • [1]
    Squid Git Commit 4f8c2e1(https://github.com/squid-cache/squid/commit/4f8c2e1)
  • [2]
    Debian Security Tracker CVE-2026-47729(https://security-tracker.debian.org/tracker/CVE-2026-47729)
  • [3]
    Calif.io Squidbleed Technical Report(https://calif.io/research/squidbleed)