CVE-2026-4424: Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing

Published Mar 19, 2026
·
Updated

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.

Other sources

A Heap Out-of-Bounds Read vulnerability exists in the RAR archive processing logic of the libarchive library. The issue arises from improper validation of the LZSS sliding window size after transitions between compression methods (PPMd and LZSS). Due to a mismatch between the allocated buffer size and the expected dictionary size, the copyfromlzsswindow() function performs out-of-bounds memory reads. This allows a specially crafted RAR archive to leak heap memory through the archivereaddata() API before integrity checks (CRC) are enforced. The vulnerability can be exploited remotely without authentication or user interaction in systems that automatically process archives, leading to disclosure of sensitive information.

— Red Hat

Accessibility. This issue was addressed through improved state management.

— Apple

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

— Apple

Accounts. A parsing issue in the handling of directory paths was addressed with improved path validation.

— Apple

Accounts. An access issue was addressed with additional sandbox restrictions.

— Apple

Credit

Andreas Jaegersberger & Ro Achterberg(Nosebeard Labs), CVE-2026-3784, CVE-2026-3783, HvxyZLF, Lance Cain - Offensive Security Engineer, SpecterOps Inc., Hyunwoo Kim@@v4bel, Gil Portnoy & Henry, Anthony Laou Hine Tsuei@@anarcheuz, Ayaan Ahmad, erdene-och Byambabayar, Niels Hofmans, an anonymous researcher, Manuel Fernandez (Stackhopper Security), Ilya Andr (andrd3v)(Positive Technologies), Stanislav Jelezoglo, Somair Ansar(Calif), Josh Maine(Calif), Johnny Franks@@zeroxjf, hxr1, Alexandre Soleiman, Alexander Tarasikov, Ruslan Dautov, Redon Gashi, Trung Nguyen@@everping(CyStack), Dave G., Nicolas Rabrenovic, Atul R V & Ashmit Sharma, Peter Malone, Hcamael, 章鱼哥 （aipyaipy.com）@@aipy, Aswin Kumar Gokulakannan, Surya Narayan Kushwaha, Dun, Richard Zana, Cem Onat Karagun, Tristan Madani@@TristanInSec(Talence Security), Michael DePlante@@izobashi(TrendAI Zero Day Initiative), Arni Hardarson, Jonathan Alush-Aben, 진규정 (Gyujeong Jin, @@G1uN4sh, PETOWORKS의 Bugeun Choi@@Bugeun, Rahul Raj, Geonha Lee@@leegn4a, 이재영, Igor Ushakov, Billy Jheng Bing Jhong(STAR Labs SG Pte), Pan Zhenpeng@@Peterpan0927(STAR Labs SG Pte), Ashish Kunwar, Hiroki Imai (LAC Co., Ltd.), Ryan Hileman via Xint Code (xint.io), f0r(MurphySec), Feng Xue(ThreatBook), XGPT(ThreatBook), Mahmoud Abdelmoniem, Wang Yu, Lyutoon, DARKNAVY@@DarkNavyOrg, Fábio Luís@@scanpt, Adam Doupé(ASU SEFCOM), 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, Ruslan Dautov(Baidu Security), 재영 정(Baidu Security), (Rao Ali Nawaz)@@rootxran(Baidu Security), Chanwit Muenprakoddee (ChemIndy)(Baidu Security), an anonymous researcher(Baidu Security), Ye Zhang@@VAR10CK(Baidu Security), Franco Belman at Blackwing Intelligence(Calif), Christian Figueroa(Calif), Johnny Franks@@zeroxjf(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), Dun(STAR Labs SG Pte), Asjid Kalam@@odinshell, Abhijeet Singh (linkedin.com/in/abhiunix/), Omar Cerrito, Wang Yu(STAR Labs SG Pte), Ji'an Zhou, Mingxuan Yang, Ye Zhang, Jian Zhou, Calif Research, Ernesto Martínez García, N.M.Praveen Nawarathne@@zblockrat, Lukas Gerlach, CVE-2026-4424, Amy (amys.website), Daniel Febrero, Nathaniel Oh@@calysteon, Robert Mindo, He Wei (ギカク)(aipyaipy), 章鱼哥@@aipy(aipyaipy), Jex Amro, Daisuke Hatakeyama Research)@@SYZD, Richard Zana(Nosebeard Labs), yk lin@@pixiepointsec, stratan@@5tratan, wh0am1i, Robert Tran, Mickey Jin@@patch1t, Koh M. Nakagawa@@tsunek0h(FFRI Security Inc), Matej Moravec@@MacejkoMoravec, Sindre Sorhus, Francisco Knabe, Hcamael(Stripe), 章鱼哥 （aipyaipy.com）@@aipy(Stripe), JC Alvarado(Stripe), Jacob Hazak, @@pixiepointsec, Ilya Andr (andrd3v), Asaf Cohen, Junming C.(Chapoly1305), Alfredo Pesoli@@__rev(Bynar), wdszzml, Atuin Automated Vulnerability Discovery Engine, Bob Gendler(the National Institute of Standards), Technology, Vivek Dhar, ASI (RM) in Border Security Force, FTR HQ BSF Kashmir, Claudio Bozzato(Cisco Talos), Francesco Benvenuto(Cisco Talos), Kitten Food, Calif.io in collaboration with Claude, Anthropic Research, Csaba Fitzl@@theevilbit(Iru), Tien-Chih Lin(CyCraft Technology), Bruce Dang(Calif), Kwak Kiyong, Song Nuri, Kagami Rosylight(Mozilla), 杉山 壮太(Z), lattice(Z), Behzad Najjarpour Jabbari@@_G4ru_(Z), Junyeong Lee(Z), Mooth.ai(Z), OGINOME Tomohito(Z), Using GLM(Z), Gia Bui@@yabeow(Calif), Milad Nasr, Nicholas Carlini with Claude, Anthropic, Heiko Kiesel(SEEMOO), TU Darmstadt, Brian Carpenter, OGINOME Tomohito, Shaheen Fazim, Mathis Mansière, Arash Ale Ebrahim(SCy), Narendra Singh@@_3P1C, Peter Malone(cyberplanet), Nicolas Rabrenovic(cyberplanet), Irvin Wang(cyberplanet), Rishabh Jain (rjcyber)(cyberplanet), Seonung Park, ALTV!ST (altvi.st/), Xint Code, Franco Belman at Blackwing Intelligence, YingQi Shi@@Mas0nShi(DBAppSecurity's WeBin lab), Rodolphe Brunetti@@eisw0lf(Lupus Nova), Daniel Williams, Arni Hardarson (Neonix Security), Anonymous(TrendAI Zero Day Initiative), ret2happy, James Duffy@@0x4A616D657344, Huỳnh Tấn Ngàn, Stanislav Jelezoglo(Positive Technologies), Jiri Ha, Gandalf4a(PKU), Anton Pakhunov, Dhiyanesh Selvaraj@@redroot97, Seiji Sakurai@@HeapSmasher, hxr1(STAR Labs SG Pte), Hiroki Imai (LAC Co.(STAR Labs SG Pte), Ltd.)(STAR Labs SG Pte), Ashish Kunwar(MurphySec), Mahmoud Abdelmoniem(ThreatBook), impost0r (ret2plt), Hyunwoo Kim@@v4bel(ThreatBook), Vladislav Shevchenko (Positive Technologies)(STAR Labs SG Pte), Steven Zhao (zhao.io), Nik Tsytsarkin, Alex Radocea, Do Young Park, OpenAI Codex Security - Amy Burnett, wwwlk, Artem Dinaburg(Trail of Bits via Anthropic CVD), Cantina, dr3dd, Tommy DeVoss@@thedawgyg(Braze Security Team), Gurpreet Shergill(Calif), Rhyru9, Merrick Hare, Khai Tran, John Lussier, Gurpreet Shergill, Drinor Selmanaj (Sentry), Utkarsh Pal, Ignacio Sanmillan@@ulexec, stratan@@5tratan(Almamater Technologies), 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), Janggoon Lee(Out of Bounds), Mateusz Krzywicki (iVerify.io), Kun Peeks@@SwayZGl1tZyyy, Josef Korbel, Josef Korbel (Citadelo)(Cisco Talos), Thomas Guillem, Charles Kern, Shubham Chaskar, Seonwook Kim, lattice, Henock Habte, Hossein Lotfi@@hosselot(TrendAI Zero Day Initiative), Utkarsh Pal(Talence Security), Narendra Singh@@_3P1C(Calif), Josef Korbel (Citadelo)(Calif), Юлия Мерцалова, Dung Do@@_piers2(Calif), Luke Francis, Muhamad Syaiful, Behzad Najjarpour Jabbari@@_G4ru_, Vitaly Simonovich, Christian Meurer Xavier, Aaron Grattafiori - NVIDIA AI Red Team, 杉山 壮太, Josef Korbel(Calif), Mohit Negi, Nan Wang@@eternalsakura13, CVE-2026-28979, Stuart Wallace, 이재영(Appknox), Jorge Welch@@jorgwelch, Rosyna Keller(Totally Not Malicious Software), 章鱼哥.com@@aipyaipy, Chris Bailey - Short Circuit, Vladislav Shevchenko (Positive Technologies), tamdao, David Strnadel, Rodolphe BRUNETTI@@eisw0lf(Lupus Nova), Surya Kushwaha, Johnny Franks@@0xjohnny(Calif), Johnny Franks@@0xjohnny, YingMuo@@YingMuo(DEVCORE Research Team), Tristan Rousseau, Dun(DARKNAVY), deepsec@@DarkNavyOrg(DARKNAVY), 彦辰, RedRays Security Team, Morris Richman@@morrisinlife, Gongyu Ma@@Mezone0, Luke Francis(Z), Francisco Alonso@@revskills(Z), Shubham Chaskar(Z), Jiyong Yang@@Sy2n0(Z), Vladislav Shevchenko (Positive Technologies)(Baidu Security), Utkarsh Pal(Almamater Technologies), Josef Korbel (Citadelo)(Talence Security), CVE-2026-43709, Soyeon Park, Amy Burnett, Kwak Kiyong(Talence Security), Song nuri(Talence Security), Jody Ritonga, Mateusz Krzywicki (iVerify.io)(Braze Security Team), dr3dd(Braze Security Team), Idan Masas, Adam Franke(CyStack), Ashish Kunwar(CyStack), Bartlomiej Dmitruk(striga), Stanislaw Strzalkowski(isec), Pinak Oza, Irvin Wang, David Ige - Beryllium Security, lokerxx(Economics), Narendra Singh@@_3P1C(Economics), Lyutoon(Economics), Jordy Zomer@@pwningsystems(Economics), Richard Zana(Economics), Aswin Kumar Gokulakannan(Economics), George Stergiopoulos(Economics), InfoSec lab(Economics), Athens University(Economics), Business, Greece, Pavan Nallamothu, Jared Reyes, Gergely Kalman@@gergely_kalman, Rajdip Dey Sarkar, Kraken Cryptocurrency Exchange(Nosebeard Labs), Matthew Schneider, Dallas Dubs(Nosebeard Labs), Aaron Grattafiori - NVIDIA AI Red Team(Nosebeard Labs), XBreach.ai(Nosebeard Labs), Yongyue WANG AKA Brian.W(OKX security), Roman Zabicki(Nosebeard Labs), Katika Mohaseen(Nosebeard Labs), an anonymous researcher(Nosebeard Labs), Mahmoud Abdelmoniem(DBAppSecurity's WeBin lab), Kujtim Kryeziu(DBAppSecurity's WeBin lab), 이재영(Nosebeard Labs), Ilya Andr (andrd3v)(Nosebeard Labs), beist, Aethel-Systems(Chongqing Telecom), Chanwit Muenprakoddee (ChemIndy)(Chongqing Telecom), 九宫格(Chongqing Telecom), Narcis Oliveras Fontàs, Zachary Neal(Stripe), 章鱼哥 (aipyaipy.com)@@aipy(Stripe), He Wei (ギカク)(Cisco Talos), Tien-Chih Lin, CVE-2025-14017, CVE-2025-14819, Jonathan Bar Or@@yo_yo_yo_jbo, Kirin@@Pwnrin(Fudan University), LFY@@secsys(Fudan University), Prathamesh Walunj@@attahasa, Atul R V, Dan Raviv, Chanwit Muenprakoddee (ChemIndy), Aethel-Systems, Pyrophoria, Estifanos Megersa, Ahmed Uddin, silo, wdszzml(Bynar), Atuin Automated Vulnerability Discovery Engine(Bynar)

Affected Software

26 affected componentsFixes available
Libarchive libarchive
Libarchive libarchive
redhat Hardened Images
redhat OpenShift Container Platform=4.0
redhat OpenShift Container Platform=4.16
redhat Openshift Container Platform For Arm64=4.16
redhat Openshift Container Platform For Power=4.16
redhat Enterprise Linux=6.0
redhat Enterprise Linux=7.0
redhat Enterprise Linux=8.0
redhat Enterprise Linux=9.0
redhat Enterprise Linux=10.0
redhat Enterprise Linux Server Aus=8.2
redhat Enterprise Linux Server Aus=8.4
debian/libarchive<=3.4.3-2+deb11u1, <=3.6.2-1+deb12u2
3.4.3-2+deb11u43.6.2-1+deb12u43.7.4-4+deb13u13.8.7-1
Apple macOS Tahoe<26.6
26.6
IBM Netezza Software<=11.3.0.3-IF2
Apple iOS<18.7.10
18.7.10
Apple iPadOS<18.7.10
18.7.10
Apple iOS<26.6
26.6
Apple iPadOS<26.6
26.6
Apple visionOS<26.6
26.6
Apple macOS Sequoia<15.7.8
15.7.8
Apple macOS Sonoma<14.8.8
14.8.8
Microsoft cbl2 libarchive 3.6.1-9<3.6.1-10
3.6.1-10
Microsoft azl3 libarchive 3.7.7-5<3.7.7-6
3.7.7-6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/libarchive to a version that resolves this vulnerability.

    Fixed in 3.4.3-2+deb11u4Fixed in 3.6.2-1+deb12u4Fixed in 3.7.4-4+deb13u1Fixed in 3.8.7-1
  2. Upgrade

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

    Fixed in 26.6
  3. Upgrade

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

    Fixed in 18.7.10
  4. Upgrade

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

    Fixed in 15.7.8
  5. Upgrade

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

    Fixed in 14.8.8
  6. Upgrade

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

    Fixed in 3.6.1-10
  7. Upgrade

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

    Fixed in 3.7.7-6

Event History

Mar 19, 2026
Data Sourced
via Red Hat·12:25 PM
DescriptionSeverityAffected Software
CVE Published
via MITRE·01:50 PM
Data Sourced
via MITRE·01:50 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·03:16 PM
DescriptionSeverityWeaknessAffected Software
Mar 25, 2026
Data Sourced
via Microsoft·08:02 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·08:02 AM
Affected Software
Updated
via Microsoft·08:02 AM
Affected Software
Updated
via Microsoft·08:02 AM
DescriptionSeverity
May 21, 2026
Data Sourced
via Launchpad·07:49 PM
Description
Data Sourced
via Debian·07:49 PM
DescriptionAffected Software
May 22, 2026
Data Sourced
via Ubuntu·07:48 PM
RemedyDescriptionSeverityAffected Software
Jul 27, 2026
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
Description
Updated
via Apple·12:00 AM
DescriptionWeakness
Updated
via Apple·12:00 AM
DescriptionAffected Software
Updated
via Apple·12:00 AM
Affected Software
Aug 17, 2026
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Aug 20, 2026
Data Sourced
via IBM·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-2026-4424?

CVE-2026-4424 is classified as a medium severity vulnerability due to its potential to lead to information disclosure.

2

How do I fix CVE-2026-4424?

To fix CVE-2026-4424, update to the latest version of libarchive that addresses this vulnerability.

3

What products are affected by CVE-2026-4424?

CVE-2026-4424 specifically affects the libarchive library used for processing RAR archives.

4

What type of vulnerability is CVE-2026-4424?

CVE-2026-4424 is an information disclosure vulnerability caused by a heap out-of-bounds read.

5

What can an attacker achieve with CVE-2026-4424?

An attacker exploiting CVE-2026-4424 could potentially read sensitive information from the heap memory.

Company

Resources

Contact

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