CoreMedia memory disclosure and denial-of-service via crafted file
CVE-2026-20609 is a memory-handling flaw in Apple's CoreMedia component. According to Apple's advisories, processing a maliciously crafted file can trigger the issue, resulting in either a denial-of-service condition or potential disclosure of memory contents. Apple states the issue was addressed with improved memory handling. The vulnerability affects multiple Apple platforms prior to the fixed releases, including watchOS 26.3, tvOS 26.3, visionOS 26.3, iOS 26.3, iPadOS 26.3, iOS 18.7.5, iPadOS 18.7.5, macOS Tahoe 26.3, macOS Sonoma 14.8.4, and macOS Sequoia 15.7.4.
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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
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity ImageIO memory disclosure vulnerability where a malicious image can expose process memory.
CoreMedia file parsing issue causing DoS and potential memory disclosure.
Crafted file processing issue causing DoS and potential memory disclosure; fixed with improved memory handling.
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.