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Process Memory Disclosure in Apple WebKit

IdentifiersCVE-2026-43740CWE-125

CVE-2026-43740 is an Apple WebKit vulnerability caused by improper memory handling. When Safari or the WebKit web-content processing components handle maliciously crafted web content, the flaw may disclose process memory. Apple indicates the issue was addressed through improved memory handling. The vulnerability affects WebKit as shipped in Safari 26.5.2 prior versions and the corresponding web-content components in iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2 prior versions.

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ANALYST BRIEF

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.

Successful exploitation may allow an attacker-controlled website or malicious web content to read and disclose portions of process memory from the targeted WebKit/Safari process. This can expose sensitive in-memory data and weaken process isolation and confidentiality. The provided content does not state that code execution or sandbox escape is achieved by this CVE.

Mitigation

If you can’t patch tonight, do this now.

Until patches are applied, reduce exposure to untrusted web content, especially attacker-controlled or suspicious websites, since exploitation requires processing maliciously crafted web content. Limiting Safari/WebKit use against untrusted content may reduce risk, but the primary mitigation is to install the vendor updates.

Remediation

Patch, then assume compromise.

Apply Apple's security updates that fix the issue: Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2. Apple states the vulnerability was remediated with improved memory handling in the affected WebKit/web-content processing components.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

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.

VendorProductType
AppleIpadosoperating_system
AppleIphone Osoperating_system
AppleMacosoperating_system
AppleSafariapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

5 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity1

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-43740
NVD
nvd.nist.gov/vuln/detail/CVE-2026-43740
MITRE CWE · CWE-125
cwe.mitre.org