CVE-2026-50012CWE-122CWE-20

Squid: Memory corruption in cache_digest reply handling

Medium · published July 16, 2026

CVSS v3.1
5.5
EPSS
1%
Percentile
71.6
In the wild
Unconfirmed
What it is

Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.01364 · 71.6th percentile
Weaknesses
CWE-122 · Heap-based Buffer Overflow; CWE-20 · Improper Input Validation
Published
2026-07-16T16:11Z
EPSS history
Timeline
  • 16 JUL 16:11Z
    Squid: Memory corruption in cache_digest reply handling
    cvelistv5