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CVE-2026-50012 is a heap-based buffer overflow in Squid's cache digest functionality affecting versions prior to 7.6. The flaw is caused by improper input validation in cache digest reply handling, specifically in peerDigestSwapInMask in src/peer_digest.cc. A cache digest reply can declare a mask_size smaller than the actual on-the-wire digest size, and Squid fails to properly validate that mismatch before processing the reply. As a result, a trusted cache peer can send a maliciously crafted response to a cache_digest request and trigger a heap overflow while Squid imports the digest mask into memory. The issue is only reachable in deployments built with the --enable-cache-digests option and configured to use cache peers.
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31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Heap-based buffer overflow in Squid's cache digest functionality, requiring compilation with --enable-cache-digests and access from a trusted peer.
An unrelated heap-based buffer overflow in Squid cache_digest reply handling, mentioned to distinguish it from Squidbleed.
A critical heap-based buffer overflow in Squid Proxy's cache digest functionality caused by improper input validation of crafted digest responses from a trusted server.
An unrelated cache_digest heap overflow vulnerability in Squid mentioned only as separately patched in Squid 7.6.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.