Zlib
21 CVEs tracked. None of them is in CISA KEV.
This hub aggregates every CVE we track for Zlib, a product in the oss libraries space. Use it to gauge the current risk picture and drill into individual advisories.
Zlib CVEs per month
| Month | CVEs |
|---|---|
| 2024-10 | 0 |
| 2024-11 | 0 |
| 2024-12 | 0 |
| 2025-01 | 0 |
| 2025-02 | 1 |
| 2025-03 | 0 |
| 2025-04 | 0 |
| 2025-05 | 0 |
| 2025-06 | 0 |
| 2025-07 | 0 |
| 2025-08 | 0 |
| 2025-09 | 0 |
| 2025-10 | 0 |
| 2025-11 | 0 |
| 2025-12 | 0 |
| 2026-01 | 1 |
| 2026-02 | 1 |
| 2026-03 | 1 |
| 2026-04 | 1 |
| 2026-05 | 0 |
| 2026-06 | 0 |
| 2026-07 | 0 |
| 2026-08 | 0 |
| 2026-09 | 1 |
Severity
How the 21 CVEs score on CVSS. Severity is not exploitation: KEV is counted above.
- Critical7
- High9
- Medium3
- Low2
Latest CVEs
The 15 most recently published vulnerabilities affecting Zlib.
- CVE-2026-85091zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate7.4
- CVE-2026-27820zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption9.8
- CVE-2026-3381Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib9.8
- CVE-2026-27171zlib 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.2.9
- CVE-2026-22184zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname()7.8
- CVE-2025-0725gzip integer overflow7.3
- CVE-2023-6992Memory corruption issues is Cloudflare zlib implementation4.0
- CVE-2023-45853MiniZip 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 supporte...9.8
- CVE-2022-37434zlib 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...9.8
- CVE-2018-25032zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.7.5
- BDU:2021-05117Уязвимость библиотеки сжатия zlib операционной системы «Аврора», позволяющая нарушителю вызвать отказ в обслуживании или оказать неопределенное воздействие7.3
- BDU:2021-03228Уязвимость библиотеки сжатия zlib операционной системы «Аврора», связанная с целочисленным переполнением, позволяющая нарушителю вызвать отказ в обслуживании или оказать неопределенное воздействие6.2
- CVE-2016-9843The 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.9.8
- CVE-2016-9842The 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.8.8
- CVE-2016-9840inftrees.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.8.8
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