CVE-2026-86907: Buffer Overflow

Published Sep 14, 2026
·
Updated

Accelerate Framework. An out-of-bounds write issue was addressed with improved bounds checking.

Other sources

Accessibility. This issue was addressed with improved data protection.

— Apple

Accounts. This issue was addressed with additional entitlement checks.

— Apple

AMD. The issue was addressed with improved checks.

— Apple

An authorization issue was addressed with improved entitlement checks. This issue is fixed in macOS Sequoia 15.8, macOS Tahoe 26.7. An app with admin privileges may be able to modify the System Keychain.

— NVD

APFS. A buffer overflow was addressed with improved size validation.

— Apple

Credit

Stuart Wallace(Totally Not Malicious Software), Rosyna Keller(Totally Not Malicious Software), Jian Lee@@speedyfriend433, Ilya Andr (andrd3v), Gongyu Ma@@Mezone0, David Strnadel, Daniel Febrero, CJ Vana, Asaf Cohen, Sindre Sorhus, LiangWei, f00l@@PPPF00L, 3ndy1@@_3ndy1, an anonymous researcher, Cem Onat Karagun, Bhaswanth Chigurupati, Zhongcheng Li (CK01), Lehan Dilusha Jayasingha (Sri Lanka), Jasminder Pal Singh, Dem0ns (@天府简易信工作室), Abdelhak Kherroubi, tamdao, Franco Belman at Blackwing Intelligence, Richard Zana, Mickey Jin@@patch1t, Pavan Nallamothu, Jared Reyes, D4rthL, Mohamad Dawoud / Abodi Dawoud, Ahmed Alwardani, Zhongcheng Li(IES Red Team), Mr.Gedik@@h4ck2s3c(Turkish Technology), Mr.Gedik@@h4ck2s3c, Oren Yomtov, Morris Richman@@morrisinlife, Kun Peeks@@SwayZGl1tZyyy, Calif.io in collaboration with Claude, Anthropic Research, Peter Malone, Ruslan Dautov, Ye Zhang@@VAR10CK(Baidu Security), CVE-2026-65414, Marc Newlin(SkySafe), jioundai, Sanny Mitra(Cystack), Sihyun Roh (Compsec(Cystack), SNU)(Cystack), ngockhanh(Cystack), 정우 하@@0xfa11babe, Suresh Sundaram, Surej Sekhar, Hari Shanmugam (The Hxr1), Ataberk Yavuzer, Roman Zabicki, Rishabh Jain (rjcyber)(cyberplanet), Pasquale Scola, Dawuge(Shuffle Team), Mathis Mansière, Nathaniel Oh@@calysteon, 이재영, Siyeong kim, Chris Bailey - Short Circuit, Meta Product Security, AL Najafi, Stuart Wallace, Kraken Cryptocurrency Exchange(Nosebeard Labs), Andreas Jaegersberger & Ro Achterberg(Nosebeard Labs), Merrick Hare, Ryan Hughes, Kujtim Kryeziu (Sentry), Mustafa Calap@@ordinal0, dbg.re), stratan@@5tratan, Rahul Raj, Yongyue WANG AKA Brian.W(OKX security), Omar Cerrito, Aaron Grattafiori - NVIDIA AI Red Team, Meshaal @ Darkcov, Joseph Shamoon, 章鱼哥 （aipyaipy.com）@@aipy, instantraaamen (github.com/instantraaamen) Contact: masa.shiramizu.com@@gmail, 章鱼哥 (aipyaipy.com）@@aipy, 章鱼哥 (aipyaipy.com)@@aipy, Thiago Mayllart, N.M.Praveen Nawarathne@@zblockrat, James Gill @infosec.exchange)@@jjtech, Tommy DeVoss@@thedawgyg(Braze Security Team), PETOWORKS의 Bugeun Choi@@Bugeun, Hyunwoo Kim@@v4bel, flower xu, Daisuke Hatakeyama, Ryohei Ueki Research)@@SYZD, Adriatik Raci, Manish Bhatt(Nosebeard Labs), Amazon Leo Security(Nosebeard Labs), Nathaniel Oh@@calysteon(Nosebeard Labs), Meta Red Team X - Nik Tsytsarkin, Junyeong Lee (jylab.github.io), Narendra Singh@@_3P1C, John Nzyuko Uvyu, Aditya Kumar, Geoffrey Lovelace, Bruce Dang(Calif), Luke Symons, Jiyong Yang, Redon Gashi(Sentry), Arni Hardarson (Neonix Security)(Talence Security), Tristan Madani@@TristanInSec(Talence Security), 정우 하, Aswin Kumar Gokulakannan, Dun, Jonathan Bar Or@@yo_yo_yo_jbo(ThreatBook), Feng Xue(ThreatBook), XGPT(ThreatBook), Alfredo Pesoli@@__rev(Bynar), Justin O'Leary@@olearysec(olearysec), Mateusz Jurczyk(Google Project Zero), Varik Matevosyan, Musaab Khan@@bxff(Tencent Xuanwu Lab), XlabAI Team(Tencent Xuanwu Lab), Atuin Automated Vulnerability Discovery Engine, Guannan Wang, Zhanpeng Liu, Jiashuo Liang, Guancheng Li, Iain Harkiss, Lyutoon, Mihalis Haatainen, Ashish Kunwar, Ari Hawking, Bernhard Jackiewicz, Svetoslav Stolarov(Calif), Josh Maine(Calif), genter0, Surya Narayan Kushwaha, James Duffy@@0x4A616D657344, Eddy Tsalolikhin, Hiroki Imai (LAC Co., Ltd.), Billy Jheng Bing Jhong(STAR Labs SG Pte), Pan Zhenpeng@@Peterpan0927(STAR Labs SG Pte), Abhijeet Singh (www.linkedin.com/in/abhiunix/), R4mbb(KRsecurity), Stuart Thomas, Vladislav Shevchenko (Positive Technologies), Fábio Luís@@scanpt(STAR Labs SG Pte), Richard Zana(STAR Labs SG Pte), OpenAI, Hüseyin Kabasakal@@HuseyinK01, CVE-2019-5598, Mohamed Wedatalla, Arjanit Isufi, HvxyZLF, Adrián Díaz Aguilar, Dave G.(supernetworks), Alex Radocea(supernetworks), Armend Gashi, Matthew Zamat, Yiğit Can YILMAZ@@yilmazcanyigit, Hoffcona(IES Red Team), Claudio Bozzato(Cisco Talos), Francesco Benvenuto(Cisco Talos), Kenneth Chew, Dora Orak, Arbuckle@@Ethan, @@leptos_null, Hongsik Kim (mnur), Prathamesh Walunj(Iru), Csaba Fitzl@@theevilbit(Iru), Ahmad Al Harrizuan Izadin, Dhiyanesh Selvaraj@@redroot97, wdszzml, Alfredo Pesoli via Bynario Atlas (bynar.io)@@__rev, Jaeho Nam(SNU CSE MMLAB), Jungbum Lee(SNU CSE MMLAB), Sangwi Kang(SNU CSE MMLAB), Hyeonguk Ko(SNU CSE MMLAB), Taekyoung Kwon(SNU CSE MMLAB), John Lussier, Filip Olszak, Abodi Dawoud(van Dijk), Roel(van Dijk), Ricardo Prado, Jakob Pammer(Calif), 재영 정(Calif), 재영 정(ThreatBook), Peter Malone(ThreatBook), Jay Patel, 재영 정, Dave G., YingMuo@@YingMuo(DEVCORE Research Team), Rodolphe BRUNETTI@@eisw0lf(Lupus Nova), 杉山 壮太, Abodi Dawoud, 糖豆爸爸(@晴天组织), Niels Hofmans, Robert Mindo, Ujjwal Reddy Kalvolu Sreenivasa Reddy, Johan Wahyudi, 이재영(Positive Technologies), Seung Je Seong(Positive Technologies), Jakob Pammer(Positive Technologies), Ilya Andr (andrd3v)(Positive Technologies), Jérôme Djouder, Amy (amys.website), Meridian Miftari, Zeyang Li&Yuxiang Wang(Chongqing Telecom), Tomi (tk0) Koski@@tomikoski, Joseph Semaan(Calif), bubu(Calif), Omar Cerrito(Calif), HE WEI (ギカク)(Calif), Roman Zabicki(Calif), Richard Zana(Calif), Chris Bailey - Short Circuit(Calif), Aswin Kumar Gokulakannan(Calif), Surya Narayan Kushwaha(Calif), He Wei（ギカク)(Calif), Niels Hofmans(sentry), Drin Raci(sentry), Manish Bhatt, Amazon Leo Security, 진규정 (Gyujeong Jin, @@G1uN4sh, Piotr Jerzy Duszynski(Google Project Zero), ธนกฤต ทัฬหะ(MurphySec), Rahul Raj(MurphySec), PETOWORKS의 Bugeun Choi@@Bugeun(MurphySec), f0r(MurphySec), hxr1, Ashish Kunwar(Positive Technologies), Mikhail Lozhnikov(Positive Technologies), Wang Yu, Liu Xue & 九宫格(Chongqing Telecom), OSORI, Pan ZhenPeng@@Peterpan0927(STAR Labs SG Pte), HE WEI（ギカク）(Calif)

Affected Software

6 affected componentsFixes available
Apple macOS Sequoia<15.8
Apple macOS Tahoe<26.7
Apple macOS Tahoe<26.7
26.7
Apple macOS Sequoia<15.8
15.8
Apple macOS<15.8
Apple macOS>=26.0<26.7

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 26.7
  2. Upgrade

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

    Fixed in 15.8
  3. Upgrade

    Upgrade macOS Sequoia to a version that resolves this vulnerability.

    Fixed in 15.8
  4. Upgrade

    Upgrade macOS Tahoe to a version that resolves this vulnerability.

    Fixed in 26.7

Event History

Sep 14, 2026
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Oct 20, 2026
CVE Published
via MITRE·12:50 AM
Data Sourced
via MITRE·12:50 AM
DescriptionWeakness
Data Sourced
via NVD·01:17 AM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What access does an attacker need to exploit this issue?

The attacker needs an app that already has administrator privileges. The issue may allow that app to modify the System Keychain.

2

Which macOS releases contain the fix?

Apple fixed the issue in macOS Sequoia 15.8 and macOS Tahoe 26.7.

3

What should be prioritized if immediate patching is not possible?

Prioritize restricting and reviewing applications with administrator privileges, since exploitation requires an admin-privileged app. Monitor such applications for unexpected System Keychain modifications.

Company

Resources

Contact

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