Heap-based buffer overflow in Squid cache_digest reply handling
CVE-2026-50012 is a heap-based buffer overflow vulnerability in Squid's cache digest functionality. According to the provided content, the flaw is caused by improper input validation when Squid processes replies to cache_digest request messages. A trusted peer/server can send a maliciously crafted cache_digest reply that triggers a heap overflow in the receiving Squid instance. The issue is specifically limited to Squid builds compiled with the --enable-cache-digests option. The content identifies Squid 7.6 as containing a fix for this issue and references GitHub Security Advisory GHSA-5vmx-9x64-9284 and patch commit 19fcfe922717c8b255270c032dcde4071c003bcd.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A heap-based buffer overflow in Squid cache_digest reply handling affecting builds compiled with --enable-cache-digests; a trusted upstream server can trigger it with a malicious reply, with potential arbitrary code execution.
The version that knows your environment.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.