CVE-2026-39871: Buffer Overflow

Published May 11, 2026
·
Updated

A path handling issue was addressed with improved logic. This issue is fixed in macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. An app may be able to observe unprotected user data.

Other sources

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

— Apple

Accessibility. This issue was addressed through improved state management.

— Apple

Accounts. A permissions issue was addressed with additional restrictions.

— Apple

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

— Apple

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

— Apple

Credit

Dave G., Aswin Kumar Gokula Kannan, Csaba Fitzl@@theevilbit(Iru), Suresh Sundaram, Jiri Ha, Arni Hardarson, wdszzml, Atuin Automated Vulnerability Discovery Engine, Johnny Franks@@zeroxjf, Google Threat Analysis Group, Mihalis Haatainen, Ari Hawking, Ashish Kunwar, Vaagn Vardanian, Nathaniel Oh@@calysteon, Yiğit Can YILMAZ@@yilmazcanyigit, Robert Tran(STAR Labs SG Pte), popku1337(STAR Labs SG Pte), Billy Jheng Bing Jhong(STAR Labs SG Pte), Pan Zhenpeng@@Peterpan0927(STAR Labs SG Pte), Aswin kumar Gokulakannan, Calif.io in collaboration with Claude, Anthropic Research, beist, Ryan Hileman via Xint Code (xint.io), Tristan Madani@@TristanInSec(Talence Security), Chris Betz, Dhiyanesh Selvaraj@@redroot97, Atul R V, Anton Pakhunov, Ricardo Prado, Ian van der Wurff (ian.nl), Ilya Sc. Jowell A., Morris Richman@@morrisinlife, Andrei Dodu, Peter Malone, Doron Assness, Alex Radocea, Amy (amys.website), YingQi Shi@@Mas0nShi(DBAppSecurity's WeBin lab), Andreas Jaegersberger & Ro Achterberg(Nosebeard Labs), an anonymous researcher, Wang Yu, Brendon Tiszka(Google Project Zero), Michael DePlante@@izobashi(TrendAI Zero Day Initiative), Peter Malone(Supernetworks), Dave G.(Supernetworks), Alex Radocea(Supernetworks), Andy Koo@@andykoo(Hexens), impost0r (ret2plt), Nicholas Soh, David Ige(Beryllium Security), Kun Peeks@@SwayZGl1tZyyy, Surya Kushwaha, Johnny Franks@@0xjohnny, Matej Moravec@@MacejkoMoravec, Seiji Sakurai@@HeapSmasher, Asaf Cohen, Arash Ale Ebrahim(SCy), Vamshi Paili, Tony Gorez for Reverse Society@@tonygo_, CVE-2026-1837, Niels Hofmans(TrendAI Zero Day Initiative), Anonymous(TrendAI Zero Day Initiative), CVE-2025-14017, CVE-2025-14819, Gandalf4a(PKU), Richard Zana, Somair Ansar, Robert Tran, Chris Betz(Talence Security), Ruslan Dautov, Prathamesh Walunj@@attahasa, Omar Cerrito, Dan Raviv, Surya Kushwaha(Supernetworks), Robert Tran(Supernetworks), Pan ZhenPeng@@Peterpan0927(STAR Labs SG Pte), David Ige - Beryllium Security, Cantina, Luke Francis, 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), Daniel Rhea, Luka Rački, wac(TrendAI Zero Day Initiative), Kookhwan Lee(TrendAI Zero Day Initiative), Mateusz Krzywicki (iVerify.io), Maher Azzouzi, Aisle offensive security research team (Joshua Rogers(Calif), Luigino Camastra(Calif), Igor Morgenstern(Calif), (Calif), Guido Vranken)(Calif), Maher Azzouzi(Calif), Ngan Nguyen(Calif), 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, Zhongcheng Li(IES Red Team), Jorge Welch@@jorgwelch

Affected Software

6 affected componentsFixes available
Apple macOS Tahoe<26.5
26.5
Apple macOS Sonoma<14.8.7
14.8.7
Apple macOS Sequoia<15.7.7
15.7.7
Apple macOS>=14.0<14.8.7
Apple macOS>=15.0<15.7.7
Apple macOS>=26.0<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 14.8.7
  2. Upgrade

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

    Fixed in 15.7.7
  3. Upgrade

    Upgrade to a fixed release 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
Affected Software
Updated
via Apple·12:00 AM
DescriptionWeakness
Updated
via Apple·12:00 AM
Description
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
DescriptionAffected 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

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-2026-39871?

The severity of CVE-2026-39871 is classified as critical due to the potential for unauthorized access to unprotected user data.

2

How do I fix CVE-2026-39871?

To fix CVE-2026-39871, update your macOS to Sequoia 15.7.7, Sonoma 14.8.7, or Tahoe 26.5.

3

Which versions of macOS are affected by CVE-2026-39871?

CVE-2026-39871 affects macOS versions earlier than Sequoia 15.7.7, Sonoma 14.8.7, and Tahoe 26.5.

4

What kind of issue is described in CVE-2026-39871?

CVE-2026-39871 describes a path handling issue along with an out-of-bounds read vulnerability.

5

What does CVE-2026-39871 allow an attacker to do?

CVE-2026-39871 may allow an attacker to observe unprotected user data, leading to potential information disclosure.

Company

Resources

Contact

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