CVE-2022-37434

CVE-2022-37434 is a critical-severity vulnerability in Zlib with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 16% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-787.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• EPSS exploit prediction: 16% (97th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-787
• Affected product: Zlib
• Published: 2022-08-05
• Last modified: 2026-06-17

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).

Frequently asked questions

What is CVE-2022-37434?

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).

How severe is CVE-2022-37434?

CVE-2022-37434 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-37434 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-37434?

CVE-2022-37434 primarily affects Zlib. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-37434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-37434 published?

CVE-2022-37434 was published on 2022-08-05 and last updated on 2026-06-17.

References

• http://seclists.org/fulldisclosure/2022/Oct/37
• http://seclists.org/fulldisclosure/2022/Oct/38
• http://seclists.org/fulldisclosure/2022/Oct/41
• http://seclists.org/fulldisclosure/2022/Oct/42
• http://www.openwall.com/lists/oss-security/2022/08/05/2
• http://www.openwall.com/lists/oss-security/2022/08/09/1
• https://github.com/curl/curl/issues/9271
• https://github.com/ivd38/zlib_overflow
• https://github.com/madler/zlib/blob/21767c654d31d2dccdde4330529775c6c5fd5389/zlib.h#L1062-L1063
• https://github.com/madler/zlib/commit/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d
• https://github.com/madler/zlib/commit/eff308af425b67093bab25f80f1ae950166bece1
• https://github.com/nodejs/node/blob/75b68c6e4db515f76df73af476eccf382bbcb00a/deps/zlib/inflate.c#L762-L764
• https://lists.debian.org/debian-lts-announce/2022/09/msg00012.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWN4VE3JQR4O2SOUS5TXNLANRPMHWV4I/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NMBOJ77A7T7PQCARMDUK75TE6LLESZ3O/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAVPQNCG3XRLCLNSQRM3KAN5ZFMVXVTY/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5U7OTKZSHY2I3ZFJSR2SHFHW72RKGDK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YRQAI7H4M4RQZ2IWZUEEXECBE5D56BH2/
• https://security.netapp.com/advisory/ntap-20220901-0005/
• https://security.netapp.com/advisory/ntap-20230427-0007/
• https://support.apple.com/kb/HT213488
• https://support.apple.com/kb/HT213489
• https://support.apple.com/kb/HT213490
• https://support.apple.com/kb/HT213491
• https://support.apple.com/kb/HT213493
• https://support.apple.com/kb/HT213494
• https://www.debian.org/security/2022/dsa-5218

Affected products (21)

• cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*
• cpe:2.3:a:netapp:hci:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:management_services_for_element_software:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:storagegrid:-:*:*:*:*:*:*:*
• cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
• cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
• cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:*

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• CVE-2016-9841 — Critical (CVSS 9.8): inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper…
• CVE-2002-0059 — Critical (CVSS 9.8): The decompression algorithm in zlib 1.1.3 and earlier, as used in many different utilities and packages, causes…
• CVE-2016-9842 — High (CVSS 8.8): The inflateMark function in inflate.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact…
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