Description
zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader (e.g., see the nodejs/node reference).
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libz-mingw-w64 | 1.2.12+dfsg-2 | — |
| Debian 14 | zlib | 1:1.2.11.dfsg-4.1 | — |
| Debian 13 | libz-mingw-w64 | 1.2.12+dfsg-2 | — |
| Debian 13 | zlib | 1:1.2.11.dfsg-4.1 | — |
| Debian 12 | libz-mingw-w64 | 1.2.12+dfsg-2 | — |
| Debian 12 | zlib | 1:1.2.11.dfsg-4.1 | — |
| Debian 11 | zlib | 1:1.2.11.dfsg-2+deb11u2 | DSA-5218-1 |
| Debian 10 | zlib | 1:1.2.11.dfsg-1+deb10u2 | DLA-3103-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | klibc | 2.0.13-4ubuntu0.1 | USN-6736-2 |
| Ubuntu 22.04 LTS | klibc | 2.0.10-4ubuntu0.1 | USN-6736-1 |
| Ubuntu 22.04 LTS | zlib | 1:1.2.11.dfsg-2ubuntu9.2 | USN-5570-2 |
| Ubuntu 20.04 LTS | klibc | 2.0.7-1ubuntu5.2 | USN-6736-1 |
| Ubuntu 20.04 LTS | rsync | 3.1.3-8ubuntu0.4 | USN-5573-1 |
| Ubuntu 20.04 LTS | zlib | 1:1.2.11.dfsg-2ubuntu1.5 | USN-5570-2 |
| Ubuntu 18.04 LTS | rsync | 3.1.2-2.1ubuntu1.5 | USN-5573-1 |
| Ubuntu 18.04 LTS | zlib | 1:1.2.11.dfsg-0ubuntu2.2 | USN-5570-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | klibc | 2.0.4-9ubuntu2.2+esm1 | USN-6736-1 |
| Ubuntu Pro 16.04 LTS | klibc | 2.0.4-8ubuntu1.16.04.4+esm2 | USN-6736-1 |
| Ubuntu Pro 16.04 LTS | rsync | 3.1.1-3ubuntu1.3+esm2 | USN-5573-1 |
| Ubuntu Pro 16.04 LTS | zlib | 1:1.2.8.dfsg-2ubuntu4.3+esm2 | USN-5570-1 |
| Ubuntu Pro 14.04 LTS | klibc | 2.0.3-0ubuntu1.14.04.3+esm3 | USN-6736-1 |
| Ubuntu Pro 14.04 LTS | zlib | 1:1.2.8.dfsg-1ubuntu1.1+esm2 | USN-5570-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | rsync +1 | 3.2.3-18.el9 | RHSA-2022:8291 |
| RHEL 9 | zlib +2 | 1.2.11-32.el9_0 | RHSA-2022:7314 |
| RHEL 8 | rsync +1 | 3.1.3-19.el8 | RHSA-2022:7793 |
| RHEL 8 | zlib +2 | 1.2.11-19.el8_6 | RHSA-2022:7106 |
| RHEL 7 | zlib +4 | 1.2.7-21.el7_9 | RHSA-2023:1095 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.6 EUS | rsync +1 | 3.1.3-14.el8_6.5 | RHSA-2024:0254 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | rsync +1 | 3.2.3-18.el9 | ALSA-2022:8291 |
| AlmaLinux 9 | zlib +2 | 1.2.11-32.el9_0 | ALSA-2022:7314 |
| AlmaLinux 8 | rsync +1 | 3.1.3-19.el8 | ALSA-2022:7793 |
| AlmaLinux 8 | zlib +2 | 1.2.11-19.el8_6 | ALSA-2022:7106 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | rsync | 3.2.3-18.el9 | RLSA-2022:8291 |
| Rocky Linux 9 | zlib | 1.2.11-32.el9_0 | RLSA-2022:7314 |
| Rocky Linux 8 | rsync | 3.1.3-19.el8 | RLSA-2022:7793 |
| Rocky Linux 8 | zlib | 1.2.11-19.el8_6 | RLSA-2022:7106 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLES 15 SP3 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLES 15 SP2 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLES 15 SP1 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLES 15 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | zlib | 1.2.11-11.22.1 | SUSE-SU-2022:2847-1 |
| SLES 12 SP4 | zlib | 1.2.11-3.9.1 | SUSE-SU-2022:2846-1 |
| SLES 12 SP3 | zlib | 1.2.8-12.9.1 | SUSE-SU-2022:2845-1 |
| SLES 12 SP2 | zlib | 1.2.8-12.9.1 | SUSE-SU-2022:2845-1 |
| SLES for SAP 15 SP2 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLES for SAP 15 SP1 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLES for SAP 15 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLES for SAP 12 SP5 | zlib | 1.2.11-11.22.1 | SUSE-SU-2022:2847-1 |
| SLES for SAP 12 SP4 | zlib | 1.2.11-3.9.1 | SUSE-SU-2022:2846-1 |
| SLE Micro 5.2 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLE Micro 5.1 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLE HPC 15 SP2 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLE HPC 15 SP1 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SLE HPC 15 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SUSE Package Hub 15 SP5 | vlc | 3.0.20-bp155.2.3.1 | openSUSE-SU-2023:0366-1 |
| SUSE Package Hub 15 SP4 | vlc | 3.0.20-bp154.2.6.1 | openSUSE-SU-2023:0365-1 |
| SUSE OpenStack Cloud Crowbar 9 | zlib | 1.2.11-3.9.1 | SUSE-SU-2022:2846-1 |
| SUSE OpenStack Cloud 9 | zlib | 1.2.11-3.9.1 | SUSE-SU-2022:2846-1 |
| SUSE Manager Server 4.1 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SUSE Manager Retail Branch Server 4.1 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SUSE Manager Proxy 4.1 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SUSE Enterprise Storage 7 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| SUSE Enterprise Storage 6 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libqt5-qtbase | 5.15.6+kde177-1.1 | openSUSE-SU-2024:12367-1 |
| openSUSE Tumbleweed | rsync | 3.2.5-1.1 | openSUSE-SU-2024:12270-1 |
| openSUSE Tumbleweed | rusty_v8 | 0.106.0-1.1 | openSUSE-SU-2024:14386-1 |
| openSUSE Tumbleweed | vlc | 3.0.19-1.1 | openSUSE-SU-2024:13367-1 |
| openSUSE Leap 15.5 | vlc | 3.0.20-bp155.2.3.1 | openSUSE-SU-2023:0366-1 |
| openSUSE Leap 15.4 | vlc | 3.0.20-bp154.2.6.1 | openSUSE-SU-2023:0365-1 |
| openSUSE Leap 15.4 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
| openSUSE Leap 15.3 | zlib | 1.2.11-150000.3.33.1 | SUSE-SU-2022:2947-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | zlib | 1.2.11-150000.3.33.1 | openSUSE-SU-2022:2947-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | zlib | 1.2.12-r2 | — |
| Alpine v3.24 | zlib-ng | 2.0.6-r0 | — |
| Alpine v3.23 | zlib | 1.2.12-r2 | — |
| Alpine v3.23 | zlib-ng | 2.0.6-r0 | — |
| Alpine v3.22 | zlib | 1.2.12-r2 | — |
| Alpine v3.22 | zlib-ng | 2.0.6-r0 | — |
| Alpine v3.21 | zlib | 1.2.12-r2 | — |
| Alpine v3.21 | zlib-ng | 2.0.6-r0 | — |
| Alpine v3.20 | zlib | 1.2.12-r2 | — |
| Alpine v3.20 | zlib-ng | 2.0.6-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | zlib | 1.2.12-r2 | — |
| Alpine v3.19 | zlib-ng | 2.0.6-r0 | — |
| Alpine v3.18 | zlib | 1.2.12-r2 | — |
| Alpine v3.18 | zlib-ng | 2.0.6-r0 | — |
| Alpine v3.17 | zlib | 1.2.12-r2 | — |
| Alpine v3.17 | zlib-ng | 2.0.6-r0 | — |
| Alpine v3.16 | zlib | 1.2.12-r2 | — |
| Alpine v3.15 | zlib | 1.2.12-r2 | — |
| Alpine v3.14 | zlib | 1.2.12-r2 | — |
| Alpine v3.13 | zlib | 1.2.12-r2 | — |
| Alpine v3.12 | zlib | 1.2.12-r2 | — |
| Alpine v3.11 | zlib | 1.2.11-r4 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | rsync +1 | 3.2.6-1.amzn2023.0.3 | ALAS2023-2023-002 |
| Amazon Linux 2023 | zlib +4 | 1.2.11-33.amzn2023.0.4 | ALAS2023-2023-003 |
| Amazon Linux 2 | rsync | 3.1.2-11.amzn2.0.2 | ALAS2-2023-2074 |
| Amazon Linux 2 | zlib +4 | 1.2.7-19.amzn2.0.2 | ALAS2-2022-1849 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cloud-hypervisor-cvm | 38.0.72.2-1 | — |
| Azure Linux 3 | crash | 8.0.4-2 | — |
| Azure Linux 3 | fltk +6 | No fix yet | — |
| Azure Linux 3 | teckit | 2.5.12-4 | — |
| Azure Linux 2 (CBL-Mariner) | ogdi | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | zlib | 1.2.12-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | rsync +1 | 3.2.3-18.el9 | ELSA-2022-8291 |
| Oracle Linux 9 | zlib +2 | 1.2.11-32.el9_0 | ELSA-2022-7314 |
| Oracle Linux 8 | rsync +1 | 3.1.3-19.el8 | ELSA-2022-7793 |
| Oracle Linux 8 | zlib +2 | 1.2.11-19.el8_6 | ELSA-2022-7106 |
| Oracle Linux 7 | zlib +4 | 1.2.7-20.0.1.el7_9 | ELSA-2023-1095, ELSA-2022-9987 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | zlib | 1.2.13-r1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 2 repositories
-
xen0bit/CVE-2022-37434_poc ★ 3 · Oct 15, 2022
u think that it doesnt but it do
-
Trinadh465/external_zlib_CVE-2022-37434 ★ 0 · Feb 2, 2024
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 50
- WID-SEC-2022-0929 zlib: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2022:8291 Moderate: rsync security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:7314 Moderate: zlib security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:7793 Moderate: rsync security and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:7106 Moderate: zlib security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:0254 Red Hat Security Advisory: rsync security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:1095 Red Hat Security Advisory: zlib security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:8291 Red Hat Security Advisory: rsync security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:7793 Red Hat Security Advisory: rsync security and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:7314 Red Hat Security Advisory: zlib security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2022:7106 Red Hat Security Advisory: zlib security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2024-0120 Oracle JD Edwards: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2023-2031 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2026-2899 Oracle Supply Chain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 18, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2023-1033 Oracle MySQL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 5, 2026
- ICSA-26-202-06 Siemens CADRA CISA ICS & IT advisories · Jul 21, 2026
- NCSC-2026-0229 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jul 14, 2026
- SSA-470355 SSA-470355: Zlib and Foxit Vulnerabilities in CADRA Siemens ProductCERT · Jul 14, 2026
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- USN-6736-1 klibc vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5570-1 zlib vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- WID-SEC-2023-0126 Oracle MySQL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 28, 2026
- USN-5573-1 rsync vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- WID-SEC-2026-0915 Kyocera Drucker: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 1, 2026
- USN-6736-2 klibc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-5570-2 zlib vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5218-1 zlib - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3103-1 zlib - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:8291 Moderate: rsync security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2022:7106 Moderate: zlib security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2022:7314 Moderate: zlib security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2022:7793 Moderate: rsync security and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2023:0365-1 Security update for vlc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12270-1 rsync-3.2.5-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:2947-1 Security update for zlib SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2847-1 Security update for zlib SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2023:0366-1 Security update for vlc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2846-1 Security update for zlib SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14386-1 rusty_v8-0.106.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2845-1 Security update for zlib SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13367-1 libvlc5-3.0.19-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2947-1 Security update for zlib SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12367-1 libQt5Bootstrap-devel-static-32bit-5.15.6+kde177-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- NCSC-2025-0382 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Dec 9, 2025
- SSA-202008 SSA-202008: Multiple Vulnerabilities in Ruggedcom Rox Before V2.17.0 Siemens ProductCERT · Dec 9, 2025
- WID-SEC-2023-1542 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
References
- https://github.com/ivd38/zlib_overflow
- https://github.com/madler/zlib/commit/eff308af425b67093bab25f80f1ae950166bece1
- https://github.com/madler/zlib/blob/21767c654d31d2dccdde4330529775c6c5fd5389/zlib.h#L1062-L1063
- https://github.com/nodejs/node/blob/75b68c6e4db515f76df73af476eccf382bbcb00a/deps/zlib/inflate.c#L762-L764
- [oss-security] 20220805 zlib buffer overflow mailing-list
- https://github.com/curl/curl/issues/9271
- [oss-security] 20220808 Re: zlib buffer overflow mailing-list
- FEDORA-2022-25e4dbedf9 vendor-advisory
- DSA-5218 vendor-advisory
- FEDORA-2022-15da0cf165 vendor-advisory
- https://security.netapp.com/advisory/ntap-20220901-0005/
- FEDORA-2022-b8232d1cca vendor-advisory
- [debian-lts-announce] 20220912 [SECURITY] [DLA 3103-1] zlib security update mailing-list
- FEDORA-2022-3c28ae0cd8 vendor-advisory
- FEDORA-2022-0b517a5397 vendor-advisory
- https://support.apple.com/kb/HT213489
- https://support.apple.com/kb/HT213488
- https://support.apple.com/kb/HT213494
- https://support.apple.com/kb/HT213493
- https://support.apple.com/kb/HT213491
- https://support.apple.com/kb/HT213490
- 20221030 APPLE-SA-2022-10-27-5 Additional information for APPLE-SA-2022-10-24-2 macOS Ventura 13 mailing-list
- 20221030 APPLE-SA-2022-10-27-2 Additional information for APPLE-SA-2022-10-24-1 iOS 16.1 and iPadOS 16 mailing-list
- 20221030 APPLE-SA-2022-10-27-1 iOS 15.7.1 and iPadOS 15.7.1 mailing-list
- 20221030 APPLE-SA-2022-10-27-6 Additional information for APPLE-SA-2022-10-24-3 macOS Monterey 12.6.1 mailing-list
- https://security.netapp.com/advisory/ntap-20230427-0007/
- https://github.com/madler/zlib/commit/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d