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Medium

Use-after-free in WebKit leading to Safari crash

IdentifiersCVE-2026-28946CWE-416· Use After Free

CVE-2026-28946 is a WebKit use-after-free vulnerability affecting Safari on macOS. Apple states that processing maliciously crafted web content may lead to an unexpected Safari crash. The issue was addressed through improved memory management and fixed in Safari 26.5 and macOS Tahoe 26.5. The available advisory information identifies the bug class as use-after-free but does not disclose the specific vulnerable function or code path.

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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 Safari to crash while processing attacker-controlled web content, resulting in denial of service to the browser. Based on the provided information, there is no confirmed public statement here that this issue enables code execution or data disclosure; the documented impact is an unexpected Safari crash.

Mitigation

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

Until patches can be applied, reduce exposure to untrusted web content, restrict browsing to trusted sites, and consider limiting use of Safari for high-risk browsing contexts. Standard browser hardening and isolation measures may reduce exposure, but no vendor-specific workaround is provided in the supplied content.

Remediation

Patch, then assume compromise.

Update affected systems to Safari 26.5 and/or macOS Tahoe 26.5, where Apple states the issue is fixed. Apply the relevant Apple security updates for supported macOS versions as provided through Apple security releases.
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
AppleMacosoperating_system
WebkitgtkWebkit2gtk3application

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

ACTIVITY FEED

Recent activity

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

7 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-2026-28946
NVD
nvd.nist.gov/vuln/detail/CVE-2026-28946
MITRE CWE · CWE-416
Use After Free
Vendor Advisory
support.apple.com/en-us/127115
support.apple.com
support.apple.com/en-us/127121