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Vulnerability record · CVE-2022-37434 · published 5 August 2022

CVE-2022-37434: Zlib out-of-bounds write vulnerability

Zlib · Zlib

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).

9.8 CVSS 3.1 Critical EPSS 18% · top 2.9% CWE-787 · Out-of-bounds writeCWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score
18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
18Affected product versions listed by NVD
59References, 9 tagged exploit
14 Jul 2026Last modified by NVD

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).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

18 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://seclists.org/fulldisclosure/2022/Oct/37 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/38 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/41 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/42 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/08/05/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/08/09/1 Mailing ListPatchThird Party Advisory
https://github.com/curl/curl/issues/9271 ExploitIssue TrackingThird Party Advisory
https://github.com/ivd38/zlib_overflow ExploitThird Party Advisory
https://github.com/madler/zlib/blob/21767c654d31d2dccdde4330529775c6c5fd5389/zlib.h#L1062-L1063 ExploitThird Party Advisory
https://github.com/madler/zlib/commit/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d
https://github.com/madler/zlib/commit/eff308af425b67093bab25f80f1ae950166bece1 PatchThird Party Advisory
https://github.com/nodejs/node/blob/75b68c6e4db515f76df73af476eccf382bbcb00a/deps/zlib/inflate.c#L762-L764 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00012.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWN4VE3JQR4O2SOUS5TXNLA Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NMBOJ77A7T7PQCARMDUK75T Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAVPQNCG3XRLCLNSQRM3KAN Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5U7OTKZSHY2I3ZFJSR2SHF Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YRQAI7H4M4RQZ2IWZUEEXEC Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20220901-0005/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20230427-0007/ Third Party Advisory
https://support.apple.com/kb/HT213488 Third Party Advisory
https://support.apple.com/kb/HT213489 Third Party Advisory
https://support.apple.com/kb/HT213490 Third Party Advisory
https://support.apple.com/kb/HT213491 Third Party Advisory
https://support.apple.com/kb/HT213493 Third Party Advisory
https://support.apple.com/kb/HT213494 Third Party Advisory
https://www.debian.org/security/2022/dsa-5218 Third Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/37 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/38 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/41 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/Oct/42 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/08/05/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/08/09/1 Mailing ListPatchThird Party Advisory
https://github.com/curl/curl/issues/9271 ExploitIssue TrackingThird Party Advisory
https://github.com/ivd38/zlib_overflow ExploitThird Party Advisory
https://github.com/madler/zlib/blob/21767c654d31d2dccdde4330529775c6c5fd5389/zlib.h#L1062-L1063 ExploitThird Party Advisory
https://github.com/madler/zlib/commit/eff308af425b67093bab25f80f1ae950166bece1 PatchThird Party Advisory
https://github.com/nodejs/node/blob/75b68c6e4db515f76df73af476eccf382bbcb00a/deps/zlib/inflate.c#L762-L764 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00012.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWN4VE3JQR4O2SOUS5TXNLA Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-37434), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.