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Process crash in Apple Safari/WebKit via maliciously crafted web content

IdentifiersCVE-2026-39872CWE-119

CVE-2026-39872 is a memory-handling vulnerability in Apple web content processing components affecting Safari 26.5.2 prior to patching, iOS 26.5.2 prior to patching, iPadOS 26.5.2 prior to patching, and macOS Tahoe 26.5.2 prior to patching. Apple states that processing maliciously crafted web content may lead to an unexpected process crash and that the issue was addressed with improved memory handling. The available advisory does not identify the specific vulnerable function or root-cause subtype beyond a memory-handling flaw.

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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 can cause the targeted web content process or Safari-related process to crash unexpectedly, resulting in denial of service for the affected browsing session or application component. Based on the provided information, there is no specific evidence that this issue enables code execution, privilege escalation, or data disclosure; the documented impact is process crash.

Mitigation

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

If immediate patching is not possible, reduce exposure by limiting access to untrusted or attacker-controlled websites and web content. Because exploitation requires processing maliciously crafted web content, standard browser hardening and minimizing browsing from affected devices may reduce risk, but no vendor-specific mitigation beyond installing the fixed versions is provided in the available content.

Remediation

Patch, then assume compromise.

Apply Apple's fixes by upgrading to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, as applicable to the affected platform.
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
AppleIosoperating_system
AppleIpadosoperating_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 activity2

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-39872
NVD
nvd.nist.gov/vuln/detail/CVE-2026-39872
MITRE CWE · CWE-119
cwe.mitre.org