CVE-2018-25032

HIGHNVD 7.58.1▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.1 because EPSS predicts 52% probability of exploitation within the next 30 days (top 1.2% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Weaponized
8.1EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 51%
  • Public exploit code is available (ssvc poc, epss top5pct, epss high)
CISA-KEV: Not listedEPSS PROB: 51%CVSS: 7.5Exploit: ssvc poc · epss top5pct · epss highExposed: 0

A fix is available — apply it.

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

CVSS v3
7.5
EG Score
8.1(high)
EG Risk
77(Attend)
EG Risk 77/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation65% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
51%
EPSS %ILE
99%
KEV
Not listed

Published

March 25, 2022

Last Modified

July 14, 2026

Advisory Details (9)

Auto-updated Jul 14, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_commit.
generic Patch Available

[SECURITY] [DLA 2968-1] zlib security update

https://lists.debian.org/debian-lts-announce/2022/04/msg00000.html
generic

CVE-2018-25032 (zlib memory corruption on deflate) · Issue #605 · madler/zlib · GitHub

https://github.com/madler/zlib/issues/605
generic

Comparing v1.2.11...v1.2.12 · madler/zlib · GitHub

https://github.com/madler/zlib/compare/v1.2.11...v1.2.12
github_commit Patch Available

commit 5c44459c3b28 (madler/zlib)

Patch available: madler/zlib v1.2.13 (contains commit 5c44459c3b28)

https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531
generic

oss-security - Re: zlib memory corruption on deflate (i.e. compress)

http://www.openwall.com/lists/oss-security/2022/03/26/1
generic

oss-security - Re: zlib memory corruption on deflate (i.e. compress)

http://www.openwall.com/lists/oss-security/2022/03/25/2
generic

Full Disclosure: APPLE-SA-2022-05-16-2 macOS Monterey 12.4

http://seclists.org/fulldisclosure/2022/May/38
generic🔴 Active Exploitation

Full Disclosure: APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6

http://seclists.org/fulldisclosure/2022/May/35
generic

Full Disclosure: APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina

http://seclists.org/fulldisclosure/2022/May/33

Vendor Advisories for CVE-2018-25032(11)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(27)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibklibc-dev (2.0.13-4ubuntu0.1) @ noble2026-05-26ubuntu
ubuntuzlib1g-dev (1:1.2.8.dfsg-2ubuntu4.3+esm1) @ xenial2026-05-26ubuntu
ubuntulibklibc-dev (2.0.3-0ubuntu1.14.04.3+esm3) @ trusty2026-05-26ubuntu
ubuntursync (3.1.2-2.1ubuntu1.4) @ bionic2026-05-26ubuntu
ubuntursync (3.1.1-3ubuntu1.3+esm1) @ xenial2026-05-26ubuntu
ubuntumariadb-test (1:10.6.11-0ubuntu0.22.10.1) @ kinetic2026-05-26ubuntu
ubuntuzlib1g-dev (1:1.2.11.dfsg-2ubuntu7.1) @ impish2026-05-26ubuntu
redhatzlib-0:1.2.7-18.el7_7.12023-02-28redhat
redhatzlib-0:1.2.7-18.el7_6.12023-02-28redhat
redhatzlib-0:1.2.7-17.el7_4.12023-02-28redhat
redhatmingw-zlib-0:1.2.12-2.el92022-11-15redhat
redhatmingw-zlib-0:1.2.8-10.el82022-11-08redhat
redhatzlib2022-10-26redhat
redhatredhat-virtualization-host-0:4.3.23-20220622.0.el7_92022-07-01redhat
redhatredhat-virtualization-host-0:4.5.0-202205291010_8.62022-06-03redhat
redhatzlib-0:1.2.11-18.el8_42022-05-31redhat
redhatrsync-0:3.2.3-9.el9_0.12022-05-18redhat
redhatzlib-0:1.2.11-31.el9_0.12022-05-17redhat
redhatrsync-0:3.1.3-7.el8_2.12022-05-11redhat
redhatrsync-0:3.1.3-14.el8_6.22022-05-11redhat
redhatzlib-0:1.2.7-20.el7_92022-05-11redhat
redhatrsync-0:3.1.3-6.el8_1.12022-05-11redhat
redhatrsync-0:3.1.3-12.el8_4.12022-05-11redhat
redhatzlib-0:1.2.3-31.el6_102022-05-11redhat
redhatzlib-0:1.2.11-17.el8_22022-05-02redhat
redhatzlib-0:1.2.11-18.el8_52022-04-28redhat
redhatzlib-0:1.2.11-11.el8_1.12022-04-26redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
nokogiri1.0.0 ... 1.9.1 (143 versions)1.13.4—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(14)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 14:51 UTCEPSS rescore
  2. 2026-07-26 14:51 UTCEPSS rescore
  3. 2026-07-25 14:14 UTCEPSS rescore
  4. 2026-07-24 14:14 UTCEPSS rescore
  5. 2026-07-24 14:14 UTCEPSS rescore
  6. 2026-07-23 14:15 UTCEPSS rescore
  7. 2026-07-23 01:35 UTCEG score recompute▲ 0.60
  8. 2026-07-22 22:15 UTCEG score recompute
  9. 2026-07-22 14:05 UTCEPSS rescore
  10. 2026-07-21 15:22 UTCEPSS rescore
  11. 2026-07-20 17:04 UTCEPSS rescore
  12. 2026-07-20 17:04 UTCEPSS rescore
  13. 2026-07-19 02:26 UTCEPSS rescore
  14. 2026-07-19 02:26 UTCEPSS rescore
  15. 2026-07-17 19:29 UTCOSV refresh
  16. 2026-07-16 16:59 UTCEPSS rescore
  17. 2026-07-16 16:59 UTCEPSS rescore
  18. 2026-07-15 16:55 UTCEPSS rescore
  19. 2026-07-15 16:55 UTCEPSS rescore
  20. 2026-07-15 01:56 UTCEPSS rescore
  21. 2026-07-15 01:56 UTCEPSS rescore
  22. 2026-07-13 22:27 UTCEPSS rescore
  23. 2026-07-13 22:26 UTCEPSS rescore
  24. 2026-07-13 06:10 UTCEPSS rescore
  25. 2026-07-12 05:43 UTCEPSS rescore
Show 73 more
  1. 2026-07-11 08:24 UTCEPSS rescore
  2. 2026-07-09 19:06 UTCEPSS rescore
  3. 2026-07-07 13:42 UTCEPSS rescore
  4. 2026-07-07 13:42 UTCEPSS rescore
  5. 2026-07-06 16:24 UTCEPSS rescore
  6. 2026-07-06 16:24 UTCEPSS rescore
  7. 2026-07-06 02:20 UTCEPSS rescore
  8. 2026-07-04 06:28 UTCEPSS rescore
  9. 2026-07-04 06:28 UTCEPSS rescore
  10. 2026-07-02 16:54 UTCEPSS rescore
  11. 2026-07-01 15:03 UTCEPSS rescore
  12. 2026-07-01 15:03 UTCEPSS rescore
  13. 2026-06-30 23:20 UTCEPSS rescore
  14. 2026-06-30 23:19 UTCEPSS rescore
  15. 2026-06-29 17:23 UTCOSV refresh
  16. 2026-06-28 04:53 UTCEPSS rescore
  17. 2026-06-28 04:53 UTCEPSS rescore
  18. 2026-06-27 03:06 UTCEPSS rescore
  19. 2026-06-27 03:06 UTCEPSS rescore
  20. 2026-06-25 13:47 UTCEPSS rescore
  21. 2026-06-25 13:47 UTCEPSS rescore
  22. 2026-06-24 14:02 UTCEPSS rescore
  23. 2026-06-24 14:02 UTCEPSS rescore
  24. 2026-06-23 21:30 UTCEPSS rescore
  25. 2026-06-23 21:30 UTCEPSS rescore
  26. 2026-06-23 21:30 UTCEPSS rescore
  27. 2026-06-21 01:57 UTCEPSS rescore
  28. 2026-06-21 01:57 UTCEPSS rescore
  29. 2026-06-19 19:23 UTCEPSS rescore
  30. 2026-06-19 19:23 UTCEPSS rescore
  31. 2026-06-18 17:50 UTCEPSS rescore
  32. 2026-06-18 17:50 UTCEPSS rescore
  33. 2026-06-17 17:50 UTCEPSS rescore
  34. 2026-06-17 17:50 UTCEPSS rescore
  35. 2026-06-16 17:50 UTCEPSS rescore
  36. 2026-06-16 17:50 UTCEPSS rescore
  37. 2026-06-15 17:45 UTCEPSS rescore
  38. 2026-06-14 23:15 UTCEPSS rescore
  39. 2026-06-14 23:14 UTCEPSS rescore
  40. 2026-06-13 22:58 UTCEPSS rescore
  41. 2026-06-12 23:09 UTCEPSS rescore
  42. 2026-06-12 23:09 UTCEPSS rescore
  43. 2026-06-12 06:06 UTCOSV refresh
  44. 2026-06-11 13:57 UTCEPSS rescore
  45. 2026-06-10 22:16 UTCEPSS rescore
  46. 2026-06-10 13:19 UTCEPSS rescore
  47. 2026-06-08 14:14 UTCEPSS rescore
  48. 2026-06-08 14:14 UTCEPSS rescore
  49. 2026-06-07 15:22 UTCEPSS rescore
  50. 2026-06-07 15:22 UTCEPSS rescore
  51. 2026-06-06 13:45 UTCEPSS rescore
  52. 2026-06-06 13:45 UTCEPSS rescore
  53. 2026-06-05 22:45 UTCEPSS rescore
  54. 2026-06-05 22:45 UTCEPSS rescore
  55. 2026-06-05 06:08 UTCEPSS rescore
  56. 2026-06-05 06:08 UTCEPSS rescore
  57. 2026-06-04 13:10 UTCEPSS rescore
  58. 2026-06-02 20:11 UTCEPSS rescore
  59. 2026-06-02 20:11 UTCEPSS rescore
  60. 2026-06-01 13:50 UTCEPSS rescore
  61. 2026-06-01 13:50 UTCEPSS rescore
  62. 2026-05-31 22:29 UTCEPSS rescore
  63. 2026-05-29 13:41 UTCEPSS rescore
  64. 2026-05-28 13:42 UTCEPSS rescore
  65. 2026-05-28 13:42 UTCEPSS rescore
  66. 2026-05-27 13:38 UTCEPSS rescore
  67. 2026-05-27 13:38 UTCEPSS rescore
  68. 2026-05-26 13:42 UTCEPSS rescore
  69. 2026-05-26 13:42 UTCEPSS rescore
  70. 2026-05-26 07:17 UTCEPSS rescore
  71. 2026-05-26 07:17 UTCEPSS rescore
  72. 2026-05-26 01:04 UTCEG score recompute
  73. 2026-05-26 01:04 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-25032?
CVE-2018-25032 is a high vulnerability published on March 25, 2022. zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.
When was CVE-2018-25032 disclosed?
CVE-2018-25032 was first published in the National Vulnerability Database on March 25, 2022, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-25032 actively exploited?
CVE-2018-25032 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51% probability of exploitation in the next 30 days, which ranks it in the top 1.2% of all scored CVEs.
What is the CVSS score of CVE-2018-25032?
CVE-2018-25032 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.1.
How do I remediate CVE-2018-25032?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-25032, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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