zlib has 5 CVEs on record between 2017 and 2026. The median CVSS is 9.8 (critical), with 3 rated critical. None have a confirmed exploitation report.
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 9.8
- Publish → KEV
- —
- Last 90 days
- 0 prev 0
Weakness classes
Products
- zlib 5
Worst active — by depth score
CVE-2022-37434Critical· 9.8zlib 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 field69CVE-2023-45853Critical· 9.8MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field55CVE-2016-9841Critical· 9.8inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.55CVE-2016-9842High· 8.8The inflateMark function in inflate.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving left shifts of negative integers.49CVE-2026-22184High· 7.8zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz43
zlib vulnerabilities
CVEs affecting zlib, newest first. Open any entry for full detail, references, and exploit status.
5 CVEsRSS
CVE-2026-22184High· 7.8zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz
zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compressi…
CVE-2023-45853Critical· 9.8⚖ disputedMiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field
MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field. NOTE: MiniZip is not a supported part of the zlib product. NOTE: pymini…
CVE-2022-37434Critical· 9.8PoC⚖ disputedzlib 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
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 af…
CVE-2016-9842High· 8.8The inflateMark function in inflate.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving left shifts of negative integers.
The inflateMark function in inflate.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving left shifts of negative integers.
CVE-2016-9841Critical· 9.8inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.
inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.