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CVE Record

CVE-2026-28946: A use-after-free issue was addressed with improved memory management.

A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.5, macOS Tahoe 26.5. Processing maliciously crafted web content may lead to an unexpected Safari crash.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Apple fixed a memory handling flaw in Safari and macOS. A user visiting maliciously crafted web content could trigger an unexpected Safari crash. The CVSS score is high, but the public description does not confirm data theft or code execution.

Executive priority

Treat this as a high-priority browser patching issue, not a confirmed breach indicator. Browser memory safety bugs can create meaningful business risk because ordinary web browsing is the trigger path.

Technical view

CVE-2026-28946 is a CWE-416 use-after-free in Apple Safari/macOS, addressed with improved memory management in Safari 26.5 and macOS Tahoe 26.5. The vector is network-adjacent through web content, requires user interaction, and carries CVSS 3.1 score 8.8.

Likely exposure

Exposure is most likely on Apple systems running Safari or macOS versions before Safari 26.5 or macOS Tahoe 26.5, especially where users browse untrusted sites or receive links through email, messaging, or collaboration tools.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires a user to process malicious web content. Public evidence only states an unexpected Safari crash; broader CVSS impact is not explained in the bundle.

Researcher notes

The bundle confirms a use-after-free and fixed versions, but gives limited technical detail. Avoid assuming remote code execution or active exploitation from the CVSS vector alone. Red Hat references are present, but the supplied affected products identify Apple Safari and macOS.

Mitigation direction

  • Update Safari to version 26.5 where applicable.
  • Update macOS Tahoe systems to version 26.5.
  • Prioritize managed endpoints used for email, web access, or privileged administration.
  • Check Apple advisories for any superseding guidance or affected-version detail.
  • Use browser isolation or link controls for high-risk users until patched.

Validation and detection

  • Inventory Safari versions across managed Apple endpoints.
  • Inventory macOS Tahoe versions across managed Apple endpoints.
  • Confirm Safari 26.5 or macOS Tahoe 26.5 is installed where applicable.
  • Review EDR or crash telemetry for unusual Safari crashes after web browsing.
  • Track Apple and CVE records for updated impact or exploitation notes.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-416: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-28946 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
15Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9redhat-SADP
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H2.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-28946Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. ADP timelineredhat-SADP

    Reported to Red Hat.

  4. ADP timelineredhat-SADP

    Made public.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPwebkitgtk: Processing maliciously crafted web content may lead to an unexpected Safari crash
other:Red Hat severity ratingcvssV3_1
  • 2026-05-11T21:08:21.720Z: Reported to Red Hat.
  • 2026-06-02T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
AppleSafari0Listed
ApplemacOS0Listed
Weakness

CWE details

CWE-416

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-416 · source CWE mapping

Use After Free

Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs