Denial-of-Service in Apple Calendar via Resource Exhaustion
CVE-2026-28872 is a resource exhaustion vulnerability in the Calendar component on Apple platforms. Apple states that the issue was addressed through improved input validation. A remote attacker may be able to trigger excessive resource consumption in Calendar, resulting in a denial-of-service condition. The issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, as well as iOS 26.4 and iPadOS 26.4.
Are you exposed to this one?
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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
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in Calendar that may be triggered by a remote attacker.
A resource exhaustion vulnerability that may allow a remote attacker to cause denial of service.
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.