CVE-2026-43707: Use After Free

Published Jun 29, 2026
·
Updated

A memory corruption issue was addressed with improved memory handling.

Impact: maliciously crafted web content may cause unexpected process crash

Advisory: https://webkitgtk.org/security/WSA-2026-0004.html WebKit Bug: https://bugs.webkit.org/showbug.cgi?id=315951

Other sources

A memory corruption issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected process crash.

— MITRE

Accounts Framework. This issue was addressed with improved data protection.

— Apple

App Store. This issue was addressed with improved checks.

— Apple

Apple Neural Engine. A use after free issue was addressed with improved memory management.

— Apple

AppleAVD. A use after free issue was addressed with improved memory management.

— Apple

Credit

Vitaly Simonovich, Christian Meurer Xavier, Gurpreet Shergill, Merrick Hare, Drinor Selmanaj (Sentry), Khai Tran, John Lussier, Rhyru9, Kwak Kiyong, Song Nuri, Jonathan Alush-Aben, stratan@@5tratan(Almamater Technologies), Josef Korbel (Citadelo)(Talence Security), Tristan Madani@@TristanInSec(Talence Security), Gia Bui@@yabeow(Calif), Narendra Singh@@_3P1C, CVE-2026-43709, Tommy DeVoss@@thedawgyg(Braze Security Team), Юлия Мерцалова, Nan Wang@@eternalsakura13, dr3dd, Milad Nasr, Nicholas Carlini with Claude, Anthropic, Luke Francis, Soyeon Park(DEVCORE Research Team), Amy Burnett(DEVCORE Research Team), Khai Tran(DEVCORE Research Team), sherkito(DEVCORE Research Team), Kota Toda(DEVCORE Research Team), HexRabbit@@h3xr4bb1t(DEVCORE Research Team), NiNi@@terrynini38514(DEVCORE Research Team), Using GLM(Z), Brian Carpenter, Utkarsh Pal, Ignacio Sanmillan@@ulexec, Kwak Kiyong(Talence Security), Song Nuri(Talence Security), Maher Azzouzi(Calif), Tuan(Calif), Duc(Calif), OpenAI Codex Security - Amy Burnett, Evan Lambert, Mateusz Krzywicki (iVerify.io)(Braze Security Team), dr3dd(Braze Security Team), Nathaniel Oh@@calysteon, Arni Hardarson, Jody Ritonga, Behzad Najjarpour Jabbari@@_G4ru_, Aaron Grattafiori - NVIDIA AI Red Team, Josef Korbel, Idan Masas, CVE-2026-28979, impost0r (ret2plt), Hyunwoo Kim@@v4bel, Feng Xue(ThreatBook), XGPT(ThreatBook), Vladislav Shevchenko (Positive Technologies)(Baidu Security), Ye Zhang@@VAR10CK(Baidu Security), Billy Jheng Bing Jhong(STAR Labs SG Pte), Pan Zhenpeng@@Peterpan0927(STAR Labs SG Pte), Lyutoon, Dun, Rosyna Keller(Totally Not Malicious Software), Rahul Raj, Franco Belman at Blackwing Intelligence, Seonung Park, ALTV!ST (altvi.st/), David Strnadel, Anton Pakhunov, Rodolphe BRUNETTI@@eisw0lf(Lupus Nova), Daniel Febrero, Daniel Williams, Anonymous(TrendAI Zero Day Initiative), ret2happy, Mathis Mansière, an anonymous researcher, James Duffy@@0x4A616D657344, 이재영, Rajdip Dey Sarkar, Arni Hardarson (Neonix Security), CVE-2026-3784, CVE-2026-3783, HvxyZLF, Huỳnh Tấn Ngàn, Ilya Andr (andrd3v)(Positive Technologies), Stanislav Jelezoglo, Redon Gashi, Michael DePlante@@izobashi(TrendAI Zero Day Initiative), Peter Malone, 진규정 (Gyujeong Jin, @@G1uN4sh, PETOWORKS의 Bugeun Choi@@Bugeun, Geonha Lee@@leegn4a, Ashish Kunwar(MurphySec), f0r(MurphySec), Mahmoud Abdelmoniem, Wang Yu, Hiroki Imai (LAC Co., Ltd.), DARKNAVY@@DarkNavyOrg, Fábio Luís@@scanpt, Nicolas Rabrenovic, Pasquale Scola(STAR Labs SG Pte), Gor Aleksanyan, impost0r (ret2plt)(Appknox), Ruslan Dautov(Appknox), Aleksandr Tarasikov(Appknox), jay(Appknox), Dhiyanesh Selvaraj@@redroot97(Appknox), Vinay Kumar Rasala (Xplo8E)(Appknox), Lyutoon(STAR Labs SG Pte), DongJun Kim (smlijun) with UIUC(STAR Labs SG Pte), Hwiwon Lee (hwiwonl) with UIUC(STAR Labs SG Pte), Jongseong Kim (nevul37) with UIUC(STAR Labs SG Pte), Younggi Park (grill66) with UIUC(STAR Labs SG Pte), Peter Malone(STAR Labs SG Pte), an anonymous researcher(STAR Labs SG Pte), Hari Shanmugam (The Hxr1)(STAR Labs SG Pte), Marco Grassi, Daniele Castronovo, Michal Kosiorek, Josh Maine(Calif), Ruslan Dautov(Baidu Security), 재영 정(Baidu Security), (Rao Ali Nawaz)@@rootxran(Baidu Security), Chanwit Muenprakoddee (ChemIndy)(Baidu Security), an anonymous researcher(Baidu Security), Franco Belman at Blackwing Intelligence(Calif), Christian Figueroa(Calif), Johnny Franks@@0xjohnny(Calif), Ashmit Sharma & Atul RV(Calif), Peter Malone(Calif), Muhamad Syaiful(Calif), Muneeb Amin Bhat(Calif), Dhiyanesh Selvaraj@@redroot97(Calif), Ali Marzouq(Calif), Bountyy Oy - Mihalis Haatainen(Calif), Huy Nguyen@@34306(Calif), Eddy Tsalolikhin, beist(ASU SEFCOM), Adam Doupé(ASU SEFCOM), Dun(STAR Labs SG Pte), Johnny Franks@@0xjohnny, Somair Ansar(Calif), Asjid Kalam@@odinshell, Abhijeet Singh (linkedin.com/in/abhiunix/), Omar Cerrito, Ryan Hileman via Xint Code (xint.io), Jian Zhou, Ye Zhang, N.M.Praveen Nawarathne@@zblockrat, Lukas Gerlach, YingMuo@@YingMuo(DEVCORE Research Team), Tristan Rousseau, Vladislav Shevchenko (Positive Technologies), Dun(DARKNAVY), deepsec@@DarkNavyOrg(DARKNAVY), Daisuke Hatakeyama Research)@@SYZD, Richard Zana(Nosebeard Labs), Andreas Jaegersberger & Ro Achterberg(Nosebeard Labs), 彦辰, stratan@@5tratan, Nik Tsytsarkin, Utkarsh Pal(Almamater Technologies), Kagami Rosylight(Mozilla), Luke Francis(Z), Francisco Alonso@@revskills(Z), Shubham Chaskar(Z), Jiyong Yang@@Sy2n0(Z), 杉山 壮太(Z), lattice(Z), Behzad Najjarpour Jabbari@@_G4ru_(Z), Junyeong Lee(Z), Mooth.ai(Z), OGINOME Tomohito(Z), Song nuri(Talence Security), Muhamad Syaiful, Niels Hofmans, OGINOME Tomohito, Shaheen Fazim, Manuel Fernandez (Stackhopper Security), wh0am1i, Francisco Knabe, Tien-Chih Lin(CyCraft Technology), YingQi Shi@@Mas0nShi(DBAppSecurity's WeBin lab), Ashish Kunwar, hxr1, CVE-2026-4424, RedRays Security Team, Soyeon Park, Amy Burnett, Heiko Kiesel(SEEMOO), TU Darmstadt

Affected Software

11 affected componentsFixes available
Apple iOS<26.5.2
26.5.2
Apple iPadOS<26.5.2
26.5.2
Apple macOS Tahoe<26.5.2
26.5.2
Apple WatchOS<26.6
26.6
Apple visionOS<26.6
26.6
Apple tvOS<26.6
26.6
Apple Safari<26.5.2
26.5.2
Apple Safari<26.5.2
Apple iPadOS<26.5.2
Apple iPhone OS<26.5.2
Apple macOS<26.5.2

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
  2. Upgrade

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

    Fixed in 26.6
  3. Upgrade

    Upgrade WebKit to a version that resolves this vulnerability.

    Fixed in Safari 26.5.2
  4. Upgrade

    Upgrade WebKit to a version that resolves this vulnerability.

    Fixed in iOS 26.5.2
  5. Upgrade

    Upgrade WebKit to a version that resolves this vulnerability.

    Fixed in iPadOS 26.5.2
  6. Upgrade

    Upgrade WebKit to a version that resolves this vulnerability.

    Fixed in macOS Tahoe 26.5.2
  7. Upgrade

    Upgrade WebKit to a version that resolves this vulnerability.

    Fixed in tvOS 26.6
  8. Upgrade

    Upgrade WebKit to a version that resolves this vulnerability.

    Fixed in visionOS 26.6
  9. Upgrade

    Upgrade WebKit to a version that resolves this vulnerability.

    Fixed in watchOS 26.6
  10. Upgrade

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

    Patch WSA-2026-0004

Event History

Jun 29, 2026
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected 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
Affected Software
Updated
via Apple·12:00 AM
DescriptionAffected Software
CVE Published
via MITRE·07:43 PM
Data Sourced
via MITRE·07:43 PM
DescriptionWeakness
Data Sourced
via NVD·08:17 PM
DescriptionSeverityWeaknessAffected Software
Jul 14, 2026
Data Sourced
via Red Hat·07:08 PM
DescriptionSeverityAffected Software
Jul 27, 2026
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
DescriptionAffected 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-2026-43707?

CVE-2026-43707 has a medium severity rating of 6.5 according to the CVSS 3.1 score.

2

How do I fix CVE-2026-43707?

To fix CVE-2026-43707, update your device to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, or macOS Tahoe 26.5.2.

3

What type of vulnerability is CVE-2026-43707?

CVE-2026-43707 is a memory corruption issue that can lead to unexpected crashes when processing malicious web content.

4

What systems are affected by CVE-2026-43707?

The affected systems include Apple’s Safari, iOS, iPadOS, macOS Tahoe, and iPhone OS.

5

What issues does CVE-2026-43707 address?

CVE-2026-43707 addresses memory corruption, double free, use after free, and race condition vulnerabilities.

Company

Resources

Contact

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