CVE-2022-37434

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because EPSS predicts 93% probability of exploitation within the next 30 days (top 0.3% of all CVEs). NVD baseline CVSS 9.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 16%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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).

CVSS v3
9.8
EG Score
9.8(high)
EPSS
96.6%
KEV
Not listed

Published

August 5, 2022

Last Modified

July 14, 2026

Advisory Details (9)

Auto-updated Jul 17, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_commit.
github_commit Patch Available

commit 1eb7682f845a (madler/zlib)

Patch available: madler/zlib v1.2.13 (contains commit 1eb7682f845a)

https://github.com/madler/zlib/commit/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d
generic

zlib/zlib.h at 21767c654d31d2dccdde4330529775c6c5fd5389 · madler/zlib · GitHub

https://github.com/madler/zlib/blob/21767c654d31d2dccdde4330529775c6c5fd5389/zlib.h#L1062-L1063
generic

Test 224 fails with CVE-2022-37434 patched zlib · Issue #9271 · curl/curl · GitHub

https://github.com/curl/curl/issues/9271
generic

oss-security - Re: zlib buffer overflow

http://www.openwall.com/lists/oss-security/2022/08/09/1
generic

oss-security - zlib buffer overflow

http://www.openwall.com/lists/oss-security/2022/08/05/2
generic

Full Disclosure: APPLE-SA-2022-10-27-6 Additional information for APPLE-SA-2022-10-24-3 macOS Monterey 12.6.1

http://seclists.org/fulldisclosure/2022/Oct/42
generic

Full Disclosure: APPLE-SA-2022-10-27-5 Additional information for APPLE-SA-2022-10-24-2 macOS Ventura 13

http://seclists.org/fulldisclosure/2022/Oct/41
generic🔴 Active Exploitation

Full Disclosure: APPLE-SA-2022-10-27-2 Additional information for APPLE-SA-2022-10-24-1 iOS 16.1 and iPadOS 16

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

Full Disclosure: APPLE-SA-2022-10-27-1 iOS 15.7.1 and iPadOS 15.7.1

http://seclists.org/fulldisclosure/2022/Oct/37

Vendor Advisories for CVE-2022-37434(9)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuzlib1g-dev (1:1.2.8.dfsg-1ubuntu1.1+esm2) @ trusty2026-05-25ubuntu
ubuntursync (3.1.3-8ubuntu0.4) @ focal2026-05-25ubuntu
ubuntulibklibc-dev (2.0.13-1ubuntu0.1) @ mantic2026-05-25ubuntu
ubuntulibklibc-dev (2.0.13-4ubuntu0.1) @ noble2026-05-25ubuntu
ubuntuzlib1g-dev (1:1.2.11.dfsg-2ubuntu9.2) @ jammy2026-05-25ubuntu
redhatrsync-0:3.1.3-14.el8_6.52024-01-15redhat
redhatzlib-0:1.2.7-21.el7_92023-03-07redhat
redhatzlib2022-12-08redhat
redhatrsync-0:3.2.3-18.el92022-11-15redhat
redhatrsync-0:3.1.3-19.el82022-11-08redhat
redhatzlib-0:1.2.11-32.el9_02022-11-02redhat
redhatzlib-0:1.2.11-19.el8_62022-10-25redhat

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.

Weakness Classification(2)

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

Additional Vendor Advisories

(5)

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 14× in last 7d / 39× 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. 2026-07-21 15:23 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-20 17:05 UTCEPSS rescore
  4. 2026-07-19 14:29 UTCEPSS rescore
  5. 2026-07-19 02:27 UTCEPSS rescore
  6. 2026-07-19 02:27 UTCEPSS rescore
  7. 2026-07-18 10:03 UTCEPSS rescore
  8. 2026-07-18 10:03 UTCEPSS rescore
  9. 2026-07-16 23:09 UTCOSV refresh
  10. 2026-07-16 17:00 UTCEPSS rescore
  11. 2026-07-15 16:56 UTCEPSS rescore
  12. 2026-07-15 16:56 UTCEPSS rescore
  13. 2026-07-15 01:58 UTCEPSS rescore
  14. 2026-07-15 01:58 UTCEPSS rescore
  15. 2026-07-13 22:28 UTCEPSS rescore
  16. 2026-07-13 22:28 UTCEPSS rescore
  17. 2026-07-12 05:44 UTCEPSS rescore
  18. 2026-07-12 05:44 UTCEPSS rescore
  19. 2026-07-11 08:25 UTCEPSS rescore
  20. 2026-07-09 19:08 UTCEPSS rescore
  21. 2026-07-08 15:12 UTCEPSS rescore
  22. 2026-07-07 13:44 UTCEPSS rescore
  23. 2026-07-06 16:25 UTCEPSS rescore
  24. 2026-07-06 16:25 UTCEPSS rescore
  25. 2026-07-05 02:28 UTCEPSS rescore
Show 43 more
  1. 2026-07-01 15:04 UTCEPSS rescore
  2. 2026-06-29 14:04 UTCEPSS rescore
  3. 2026-06-28 22:02 UTCOSV refresh
  4. 2026-06-28 14:06 UTCEPSS rescore
  5. 2026-06-28 04:54 UTCEPSS rescore
  6. 2026-06-28 04:54 UTCEPSS rescore
  7. 2026-06-27 03:07 UTCEPSS rescore
  8. 2026-06-27 03:07 UTCEPSS rescore
  9. 2026-06-25 13:48 UTCEPSS rescore
  10. 2026-06-25 13:48 UTCEPSS rescore
  11. 2026-06-24 14:03 UTCEPSS rescore
  12. 2026-06-24 14:03 UTCEPSS rescore
  13. 2026-06-23 21:31 UTCEPSS rescore
  14. 2026-06-23 21:31 UTCEPSS rescore
  15. 2026-06-21 14:55 UTCEPSS rescore
  16. 2026-06-21 14:55 UTCEPSS rescore
  17. 2026-06-21 01:58 UTCEPSS rescore
  18. 2026-06-21 01:58 UTCEPSS rescore
  19. 2026-06-18 17:51 UTCEPSS rescore
  20. 2026-06-18 17:51 UTCEPSS rescore
  21. 2026-06-17 17:51 UTCEPSS rescore
  22. 2026-06-17 17:51 UTCEPSS rescore
  23. 2026-06-16 17:51 UTCEPSS rescore
  24. 2026-06-15 17:46 UTCEPSS rescore
  25. 2026-06-12 23:10 UTCEPSS rescore
  26. 2026-06-12 23:10 UTCEPSS rescore
  27. 2026-06-11 17:25 UTCOSV refresh
  28. 2026-06-11 13:58 UTCEPSS rescore
  29. 2026-06-11 13:58 UTCEPSS rescore
  30. 2026-06-10 22:17 UTCEPSS rescore
  31. 2026-06-05 06:09 UTCEPSS rescore
  32. 2026-06-05 06:09 UTCEPSS rescore
  33. 2026-05-31 00:15 UTCEPSS rescore
  34. 2026-05-31 00:15 UTCEPSS rescore
  35. 2026-05-27 13:39 UTCEPSS rescore
  36. 2026-05-27 13:39 UTCEPSS rescore
  37. 2026-05-26 07:17 UTCEPSS rescore
  38. 2026-05-26 07:17 UTCEPSS rescore
  39. 2026-05-26 07:17 UTCEPSS rescore
  40. 2026-05-25 17:48 UTCEG score recompute
  41. 2026-05-25 17:48 UTCVendor advisory
  42. 2026-05-25 17:48 UTCGHSA enrichment
  43. 2026-05-24 16:51 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCxen0bit/CVE-2022-37434_poc
    First seen Oct 15, 2022

    u think that it doesnt but it do

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2022-37434?
CVE-2022-37434 is a critical vulnerability published on August 5, 2022. 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…
When was CVE-2022-37434 disclosed?
CVE-2022-37434 was first published in the National Vulnerability Database on August 5, 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-2022-37434 actively exploited?
CVE-2022-37434 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-37434?
CVE-2022-37434 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-37434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-37434, 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.

Dependency Blast Radius

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