Process memory disclosure in Apple ImageIO via crafted image parsing
CVE-2026-20634 is an Apple ImageIO memory-handling flaw where processing a maliciously crafted image can cause disclosure of process memory. The issue is described as being fixed via improved memory handling and is associated (per the provided supporting content) with out-of-bounds read behavior during image parsing (notably referenced in relation to SGI image parsing in ImageIO), resulting in reads past the end of an allocated buffer and subsequent exposure of in-process memory contents to the attacker-controlled parsing context.
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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
12 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.
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.