Home/CVE/zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matche
CVE

CVE-2018-25032

zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matche

zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.

HIGH · CVSS 7.5 EPSS 0.00089
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

37
nokogiri< 1.13.4
python>= 3.7.0 and < 3.7.14
python>= 3.8.0 and < 3.8.14
python>= 3.9.0 and < 3.9.13
python>= 3.10.0 and < 3.10.5
zlib>= 1.2.2.2 and < 1.2.12
debian linuxall versions
fedoraproject fedoraall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
RubyGems nokogiri HIGH fixed in 1.13.4
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumGoToAssist Temporary Installation Artefact
productmediumRemote Access Tool - GoToAssist Execution
producthighPython Reverse Shell Execution Via PTY And Socket Modules
producthighInline Python Execution - Spawn Shell Via OS System Library
producthighPython One-Liners with Base64 Decoding - Linux
producthighPython Function Execution Security Warning Disabled In Excel
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 Mar 2022 · 09:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
suse-csafopenSUSE-SU-2026:10356-1
suse-csafopenSUSE-SU-2025:14697-1
suse-csafopenSUSE-SU-2025:14656-1
suse-csafopenSUSE-SU-2024:14174-1
suse-csafopenSUSE-SU-2024:11966-1
🔗

References & Sources

29
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://seclists.org/fulldisclosure/2022/May/33Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/May/35Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2022/May/38Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/03/25/2Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/03/26/1ExploitMailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-333517.pdfThird Party Advisory
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