CVE-2026-43660: Buffer Overflow

Published May 11, 2026
·
Updated

A validation issue was addressed with improved logic. This issue is fixed in Safari 26.5, iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.

Other sources

Accelerate. An out-of-bounds read was addressed with improved bounds checking.

— Apple

Accounts. A permissions issue was addressed with additional restrictions.

— Apple

Accounts. An authorization issue was addressed with improved state management.

— Apple

AirDrop. A reachable assertion was addressed with improved input validation.

— Apple

APFS. A buffer overflow was addressed with improved bounds checking.

— Apple

Credit

Cantina, Luke Francis, Vaagn Vardanian, kwak kiyong / kakaogames, Vitaly Simonovich, Adel Bouachraoui, greenbynox, Do Young Park, Artem Dinaburg(Trail of Bits via Anthropic CVD), Yuhao Hu, Yuanming Lai, Chenggang Wu, Zhe Wang, Idan Masas(TrendAI Zero Day Initiative), DARKNAVY@@DarkNavyOrg(TrendAI Zero Day Initiative), Anonymous(TrendAI Zero Day Initiative), Daniel Rhea, Luka Rački, wac(TrendAI Zero Day Initiative), Kookhwan Lee(TrendAI Zero Day Initiative), Mateusz Krzywicki (iVerify.io), Maher Azzouzi, Tristan Madani@@TristanInSec(Talence Security), Nathaniel Oh@@calysteon, Aisle offensive security research team (Joshua Rogers(Calif), Luigino Camastra(Calif), Igor Morgenstern(Calif), (Calif), Guido Vranken)(Calif), Maher Azzouzi(Calif), Ngan Nguyen(Calif), an anonymous researcher, dr3dd, Gia Bui@@yabeow(Calif), w0wbox, Milad Nasr, Nicholas Carlini with Claude, Anthropic, Khiem Tran, lebr0nli(National Yang Ming Chiao Tung University), Security, Systems Lab, Kenneth Hsu(Palo Alto Networks), Jérôme DJOUDER, Arash Ale Ebrahim(SCy), Dave G., Vamshi Paili, Tony Gorez for Reverse Society@@tonygo_, CVE-2026-1837, impost0r (ret2plt), Nicholas Soh, David Ige(Beryllium Security), Alan Wang, Ailsa Sun, Christopher W. Fletcher, Hovav Shacham, David Kohlbrenner, Riccardo Paccagnella, Andreas Jaegersberger & Ro Achterberg(Nosebeard Labs), Niels Hofmans(TrendAI Zero Day Initiative), Alex Radocea, Gandalf4a(PKU), Anton Pakhunov, Suresh Sundaram, Jiri Ha, Arni Hardarson, Johnny Franks@@0xjohnny, Google Threat Analysis Group, Mihalis Haatainen, Ari Hawking, Ashish Kunwar, Richard Zana, Dhiyanesh Selvaraj@@redroot97, Somair Ansar, popku1337(STAR Labs SG Pte), Billy Jheng Bing Jhong(STAR Labs SG Pte), Pan Zhenpeng@@Peterpan0927(STAR Labs SG Pte), Robert Tran, Aswin kumar Gokulakannan, Csaba Fitzl@@theevilbit(Iru), Ryan Hileman via Xint Code (xint.io), Chris Betz(Talence Security), Ruslan Dautov, Zhongcheng Li (CK01), Atul R V, Omar Cerrito, Ricardo Prado, Ian van der Wurff (ian.nl), Michael DePlante@@izobashi(TrendAI Zero Day Initiative), Asaf Cohen, Ilya Sc. Jowell A., Peter Malone, Jorge Welch, Doron Assness, Andy Koo@@andykoo(Hexens), Adriatik Raci, Abhay Kailasia@@abhay_kailasia(Safran Mumbai India), Brendon Tiszka(Google Project Zero), Seiji Sakurai@@HeapSmasher, Rosyna Keller(Totally Not Malicious Software), Alvin Aries Tapia, XiguaSec, Yiğit Can YILMAZ@@yilmazcanyigit, Robert Tran(STAR Labs SG Pte), Calif.io in collaboration with Claude, Anthropic Research, Chris Betz, Ilya Andr (andrd3v)(RTU MIREA), Ilias Morad (A2nkF)(Voynich Group), Duy Trần@@khanhduytran0, @@hugeBlack, Guy Dor, Wang Yu, CVE-2025-14017, CVE-2025-14819, Kun Peeks@@SwayZGl1tZyyy, Aswin Kumar Gokula Kannan, wdszzml, Atuin Automated Vulnerability Discovery Engine, beist, Prathamesh Walunj@@attahasa, Dan Raviv, Surya Kushwaha(Supernetworks), Robert Tran(Supernetworks), Peter Malone(Supernetworks), Dave G.(Supernetworks), Alex Radocea(Supernetworks), Pan ZhenPeng@@Peterpan0927(STAR Labs SG Pte), Amy (amys.website), YingQi Shi@@Mas0nShi(DBAppSecurity's WeBin lab), David Ige - Beryllium Security

Affected Software

17 affected componentsFixes available
Apple macOS Tahoe<26.5
26.5
Apple iOS<26.5
26.5
Apple iPadOS<26.5
26.5
Apple visionOS<26.5
26.5
Apple tvOS<26.5
26.5
Apple WatchOS<26.5
26.5
Apple iOS<18.7.9
18.7.9
Apple iPadOS<18.7.9
18.7.9
Apple iPadOS<18.7.9
Apple iPadOS>=26.0<26.5
Apple iPhone OS<18.7.9
Apple iPhone OS>=26.0<26.5
Apple macOS>=26.0<26.5
Apple tvOS<26.5
Apple visionOS<26.5
Apple WatchOS<26.5
Apple Safari<26.5
26.5

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 26.5
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 18.7.9
  3. Upgrade

    Upgrade Apple Safari to a version that resolves this vulnerability.

    Fixed in 26.5
  4. Upgrade

    Upgrade Apple iOS to a version that resolves this vulnerability.

    Fixed in 18.7.9
  5. Upgrade

    Upgrade Apple iPadOS to a version that resolves this vulnerability.

    Fixed in 18.7.9
  6. Upgrade

    Upgrade Apple iOS to a version that resolves this vulnerability.

    Fixed in 26.5
  7. Upgrade

    Upgrade Apple iPadOS to a version that resolves this vulnerability.

    Fixed in 26.5
  8. Upgrade

    Upgrade Apple macOS Tahoe to a version that resolves this vulnerability.

    Fixed in 26.5
  9. Upgrade

    Upgrade Apple tvOS to a version that resolves this vulnerability.

    Fixed in 26.5
  10. Upgrade

    Upgrade Apple visionOS to a version that resolves this vulnerability.

    Fixed in 26.5
  11. Upgrade

    Upgrade Apple watchOS to a version that resolves this vulnerability.

    Fixed in 26.5

Event History

May 11, 2026
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
DescriptionWeakness
Updated
via Apple·12:00 AM
Affected Software
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
CVE Published
via MITRE·08:07 PM
Data Sourced
via MITRE·08:07 PM
DescriptionWeakness
Data Sourced
via NVD·09:19 PM
DescriptionSeverityWeaknessAffected Software
May 13, 2026
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Jun 2, 2026
Data Sourced
via Red Hat·01:43 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2026-43660?

CVE-2026-43660 has been assigned a moderate severity level due to a validation issue that impacts the enforcement of Content Security Policy.

2

How do I fix CVE-2026-43660?

To fix CVE-2026-43660, users should update to the latest version of affected software, specifically Safari 26.5, iOS 18.7.9, iPadOS 18.7.9, and other related Apple operating systems.

3

What systems are affected by CVE-2026-43660?

CVE-2026-43660 affects several Apple products including Safari, iOS, iPadOS, macOS Tahoe, tvOS, visionOS, and watchOS prior to specified versions.

4

What is the impact of CVE-2026-43660?

CVE-2026-43660 may allow maliciously crafted web content to bypass Content Security Policy enforcement, potentially leading to security vulnerabilities.

5

Is there a patch for CVE-2026-43660?

Yes, Apple has released patches that resolve CVE-2026-43660 in the latest versions of the affected operating systems and applications.

Company

Resources

Contact

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