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4 vulnerabilities found for zlib by zlib
CVE-2026-85091 (GCVE-0-2026-85091)
Vulnerability from cvelistv5 – Published: 2026-09-03 01:04 – Updated: 2026-09-03 13:21
VLAI
EPSS
VEX
Title
zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate
Summary
zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 13:21 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://gist.github.com/thesmartshadow/e0b9481792… | technical-descriptionexploit |
| https://github.com/madler/zlib/blob/v1.3.2/gzwrit… | technical-description |
| https://github.com/madler/zlib | product |
| https://www.vulncheck.com/advisories/zlib-1.3.1.2… | third-party-advisory |
Impacted products
Date Public
2026-09-02 00:00
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CVE-2026-76844 (GCVE-0-2026-76844)
Vulnerability from cvelistv5 – Published: 2026-08-24 13:12 – Updated: 2026-10-01 11:03
VLAI
EPSS
VEX
Title
zlib 1.2.11 through 1.3.2 Heap Buffer Overflow via Stale gzwrite Pointer After Failed Write
Summary
zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 18:22 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://gist.github.com/thesmartshadow/e0b9481792… | technical-descriptionexploit |
| https://github.com/madler/zlib/commit/df84af25dc1… | patch |
| https://github.com/madler/zlib/blob/v1.3.2/gzwrit… | technical-description |
| https://github.com/madler/zlib | product |
| https://www.vulncheck.com/advisories/zlib-1.3.1.2… | third-party-advisory |
Impacted products
Date Public
2026-09-02 00:00
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CVE-2026-27171 (GCVE-0-2026-27171)
Vulnerability from cvelistv5 – Published: 2026-02-18 02:36 – Updated: 2026-02-18 13:38
VLAI
EPSS
VEX
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-18 13:35 UTC
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
Impacted products
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CVE-2023-45853 (GCVE-0-2023-45853)
Vulnerability from cvelistv5 – Published: 2023-10-14 00:00 – Updated: 2026-07-14 12:07
VLAI
EPSS
VEX
Summary
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.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-19 03:55 UTC
CWE
- n/a
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
14 references
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| zlib | zlib |
Affected:
0 , < 1.3
(custom)
cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:* |
|
| Siemens | CADRA |
Affected:
0 , < V2511
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
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