CVE-2026-39872Public exploitNetwork attack vector

Process crash via vector mutation during iteration

Published Jun 29, 2026 · Updated Jun 29, 2026

Memory corruption in WebKit in Safari, iOS, iPadOS, and macOS before 26.5.2 allows remote attackers to crash a process. LocalFrameViewLayoutContext::removeScrollerFromAnchorScrollAdjusters removes entries from m_anchorScrollAdjusters through unregisterAnchorScrollAdjusterFor while iterating the same vector, invalidating the iteration. Exploitation requires processing attacker-controlled web content, and the bounded reported consequence is an unexpected process crash.

CVSS severity6.5
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in WebKit in Safari, iOS, iPadOS, and macOS before 26.5.2 allows remote attackers to crash a process. LocalFrameViewLayoutContext::removeScrollerFromAnchorScrollAdjusters removes entries from m_anchorScrollAdjusters through unregisterAnchorScrollAdjusterFor while iterating the same vector, invalidating the iteration. Exploitation requires processing attacker-controlled web content, and the bounded reported consequence is an unexpected process crash.

The record

CVE
CVE-2026-39872
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-119, CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <26.5.2
Apple · Safariversion=0 <26.5.2
Apple · macOSversion=0 <26.5.2

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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