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CVE-2026-20634 is an information disclosure vulnerability in Apple ImageIO affecting multiple Apple operating systems. The flaw occurs when ImageIO processes a maliciously crafted SGI image and reads past the end of an allocated buffer, resulting in an out-of-bounds read. Apple states the issue was addressed through improved memory handling. Successful exploitation can disclose process memory from the context of the application or component performing the image parsing. The vulnerability has been described as affecting macOS and was also fixed in iOS, iPadOS, tvOS, visionOS, and watchOS releases that include the vulnerable ImageIO component. In some analyses, the memory disclosure is noted as potentially useful for chaining with other vulnerabilities to facilitate further exploitation in the current process context.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
ImageIO image parsing issue causing process memory disclosure.
Local DoS causing unexpected system termination; fixed with improved memory handling.
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.