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CVE-2026-20347 is a memory corruption vulnerability in ClamAV's Mach-O file format parser. The flaw is caused by improper boundary checks while processing Mach-O content during scanning, leading to undefined behavior, integer overflow, and an out-of-bounds buffer read when a malformed Mach-O file is parsed. An unauthenticated remote attacker can trigger the issue by supplying a crafted Mach-O file to a system that uses ClamAV to scan untrusted content. The vulnerable versions are ClamAV 1.4.5 and earlier, and ClamAV 1.5.0 through 1.5.3.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An out-of-bounds read vulnerability in ClamAV Mach-O parsing that can crash the scanner and cause denial of service during scanning of attacker-controlled files.
A ClamAV parser vulnerability that could allow a remote, unauthenticated attacker to trigger a denial-of-service condition in affected Cisco Secure Endpoint Connector deployments.
Undefined behavior and integer overflow in the ClamAV Mach-O parser that can cause a crash while scanning a malformed Mach-O file.
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.