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Including CVEs outside Waratek scope✕Product zlib✕
Overview 19 matches · 0 in Waratek scope · 0 protected · 1 exploited · 0 CISA KEV · 2 public PoC · 1 EPSS ≥ 0.5
19matches 0in Waratek scope0.0% 0protected0.0% 1exploited5.3% 0CISA KEV0.0% 2public PoC10.5% 1EPSS ≥ 0.55.3%
Protected by Waratek 0 0.0% Rule in development 0 0.0% Mitigation candidate 0 0.0% No exploit published 0 0.0% Outside Waratek scope 4 21.1% Not applicable 15 78.9% Withdrawn CVE 0 0.0%
Critical 5 26.3% High 5 26.3% Medium 7 36.8% Low 2 10.5% None 0 0.0% Unknown 0 0.0%
blocked by ARMR today 0 0.0% partly blocked 0 0.0% not blocked 19 100.0% not established 0 0.0% unrecorded 0 0.0%
Exploited 1 5.3% Working exploit published 1 5.3% Proof of concept only 5 26.3% Forecast only 0 0.0% No public exploit 12 63.2%
split by peak 4 / year
Not applicable: 15Outside Waratek scope: 4 Low: 2Medium: 7High: 5Critical: 5 not blocked: 19 No public exploit: 12Proof of concept only: 5Working exploit published: 1Exploited: 1
20022 Not applicable2 Critical1 Medium1 not blocked2 No public exploit2 20031 Not applicable1 High1 not blocked1 Working exploit published1 20041 Not applicable1 Low1 not blocked1 No public exploit1 20052 Not applicable2 High1 Medium1 not blocked2 No public exploit2 20060 20070 20080 20091 Not applicable1 Medium1 not blocked1 Exploited1 20100 20110 20120 20130 20140 20150 20160 20174 Outside Waratek scope2 Not applicable2 Critical2 High2 not blocked4 No public exploit4 20180 20190 20200 20210 20222 Outside Waratek scope2 Critical1 High1 not blocked2 Proof of concept only2 20232 Not applicable2 Critical1 Medium1 not blocked2 Proof of concept only1 No public exploit1 20241 Not applicable1 Medium1 not blocked1 No public exploit1 20250 20263 Not applicable3 Medium2 Low1 not blocked3 Proof of concept only2 No public exploit1
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19 matches Sign in to download these CVEs as CSV or JSON, or to follow them in a feed.
CVE Severity Published▾ Status Exploitation Description
CVE-2026-27820 Low 2026-04-16 Not applicable No public exploit zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.
CVE-2026-27171 Medium 2026-02-18 Not applicable Proof of concept only zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.
CVE-2026-22184 Medium 2026-01-07 Not applicable Proof of concept only 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 compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.
CVE-2023-6992 Medium 2024-01-04 Not applicable No public exploit Cloudflare version of zlib library was found to be vulnerable to memory corruption issues affecting the deflation algorithm implementation (deflate.c). The issues resulted from improper input validation and heap-based buffer overflow. A local attacker could exploit the problem during compression using a crafted malicious file potentially leading to denial of service of the software. Patches: The issue has been patched in commit 8352d10 https://github.com/cloudflare/zlib/commit/8352d108c05db1bdc5ac3bdf834dad641694c13c . The upstream repository is not affected.
CVE-2023-45853 Critical 2023-10-14 Not applicable No public exploit 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: pyminizip through 0.2.6 is also vulnerable because it bundles an affected zlib version, and exposes the applicable MiniZip code through its compress API.
CVE-2023-0892 Medium 2023-05-15 Not applicable Proof of concept only The BizLibrary WordPress plugin through 1.1 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)
CVE-2022-37434 Critical 2022-08-05 Outside Waratek scope Proof of concept only 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).
CVE-2018-25032 High 2022-03-25 Outside Waratek scope Proof of concept only zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.
CVE-2016-9843 Critical 2017-05-23 Outside Waratek scope No public exploit The crc32_big function in crc32.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving big-endian CRC calculation.
CVE-2016-9842 High 2017-05-23 Not applicable No public exploit 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-2016-9841 Critical 2017-05-23 Not applicable No public exploit inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.
CVE-2016-9840 High 2017-05-23 Outside Waratek scope No public exploit inftrees.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.
CVE-2009-1391 Medium 2009-06-16 Not applicable Exploited Off-by-one error in the inflate function in Zlib.xs in Compress::Raw::Zlib Perl module before 2.017, as used in AMaViS, SpamAssassin, and possibly other products, allows context-dependent attackers to cause a denial of service (hang or crash) via a crafted zlib compressed stream that triggers a heap-based buffer overflow, as exploited in the wild by Trojan.Downloader-71014 in June 2009.
CVE-2005-1849 Medium 2005-07-26 Not applicable No public exploit inftrees.h in zlib 1.2.2 allows remote attackers to cause a denial of service (application crash) via an invalid file that causes a large dynamic tree to be produced.
CVE-2005-2096 High 2005-07-06 Not applicable No public exploit zlib 1.2 and later versions allows remote attackers to cause a denial of service (crash) via a crafted compressed stream with an incomplete code description of a length greater than 1, which leads to a buffer overflow, as demonstrated using a crafted PNG file.
CVE-2004-0797 Low 2004-10-20 Not applicable No public exploit The error handling in the (1) inflate and (2) inflateBack functions in ZLib compression library 1.2.x allows local users to cause a denial of service (application crash).
CVE-2003-0107 High 2003-03-07 Not applicable Working exploit published Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnprintf, allows attackers to cause a denial of service or possibly execute arbitrary code.
CVE-2002-2102 Medium 2002-12-31 Not applicable No public exploit InfBlocks.java in JCraft JZlib before 0.0.7 allow remote attackers to cause a denial of service (NullPointerException) via an invalid block of deflated data.
CVE-2002-0059 Critical 2002-03-15 Not applicable No public exploit The decompression algorithm in zlib 1.1.3 and earlier, as used in many different utilities and packages, causes inflateEnd to release certain memory more than once (a "double free"), which may allow local and remote attackers to execute arbitrary code via a block of malformed compression data.