CVE-2026-22184

CRITICALNVD 7.89.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-01-07. NVD baseline CVSS 7.8; sources differ by 2.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.

CVSS v3
7.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

January 7, 2026

Last Modified

September 1, 2026

Advisory Details (8)

Auto-updated Jun 30, 2026
Patch available. Sources: redhat.
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json
redhat Patch Available

2427688 – (CVE-2026-22184) CVE-2026-22184 zlib: zlib: Arbitrary code execution via buffer overflow in untgz utility

https://bugzilla.redhat.com/show_bug.cgi?id=2427688
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-22184
generic

contrib/ungtz: Buffer Overflow in TGZfname() via Unbounded strcpy() on User-Supplied Archive Name · Issue #1142 · madler/zlib · GitHub

https://github.com/madler/zlib/issues/1142
generic

zlib Home Site

https://zlib.net/
generic

zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname
generic

Full Disclosure: zlib v1.3.1.2 Global Buffer Overflow in TGZfname() of zlib untgz Utility via Unbounded strcpy() on User-Supplied Archive Name

https://seclists.org/fulldisclosure/2026/Jan/3
generic

GitHub - madler/zlib: A massively spiffy yet delicately unobtrusive compression library. · GitHub

https://github.com/madler/zlib

Vendor Advisories for CVE-2026-22184(2)

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

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
zlib—1.3.2-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
zlib—1.3.2-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
zlib—1.3.2-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
zlib—1.3.2-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
zlib—1.3.2-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
zlib—1:1.2.6.dfsg-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
zlib—1:1.2.6.dfsg-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
zlib—1:1.2.6.dfsg-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
zlib—1:1.2.6.dfsg-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 27× 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.

Showing the most recent 100 of 168 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-20 12:21 UTCOSV refresh
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-16 14:07 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-12 15:01 UTCEPSS rescore
  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-02 14:11 UTCEPSS rescore
  16. 2026-09-01 13:53 UTCEG score recompute
  17. 2026-09-01 13:53 UTCEPSS rescore
  18. 2026-09-01 13:53 UTCGHSA enrichment
  19. 2026-09-01 12:25 UTCEG score recompute
  20. 2026-09-01 12:25 UTCGHSA enrichment
  21. 2026-09-01 04:39 UTCEPSS rescore
  22. 2026-08-30 19:17 UTCEPSS rescore
  23. 2026-08-30 01:22 UTCEPSS rescore
  24. 2026-08-28 21:41 UTCEPSS rescore
  25. 2026-08-27 14:25 UTCEPSS rescore
Show 75 more
  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:48 UTCEPSS rescore
  3. 2026-08-23 00:19 UTCEPSS rescore
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 12:33 UTCEG score recompute
  6. 2026-08-21 12:33 UTCGHSA enrichment
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-19 17:03 UTCEPSS rescore
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 02:14 UTCEPSS rescore
  13. 2026-08-15 01:30 UTCEPSS rescore
  14. 2026-08-14 23:55 UTCGHSA enrichment
  15. 2026-08-14 15:42 UTCEG score recompute
  16. 2026-08-14 15:42 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-12 13:50 UTCEPSS rescore
  19. 2026-08-11 13:42 UTCEPSS rescore
  20. 2026-08-11 00:00 UTCEPSS rescore
  21. 2026-08-09 21:18 UTCEG score recompute
  22. 2026-08-09 21:18 UTCGHSA enrichment
  23. 2026-08-09 13:46 UTCEPSS rescore
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-08 09:45 UTCGHSA enrichment
  26. 2026-08-08 05:32 UTCGHSA enrichment
  27. 2026-08-08 01:19 UTCEG score recompute
  28. 2026-08-08 01:19 UTCGHSA enrichment
  29. 2026-08-06 13:46 UTCEPSS rescore
  30. 2026-08-06 06:12 UTCEG score recompute
  31. 2026-08-06 06:12 UTCGHSA enrichment
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-04 15:10 UTCEPSS rescore
  34. 2026-08-04 10:38 UTCEPSS rescore
  35. 2026-08-03 10:35 UTCEPSS rescore
  36. 2026-08-02 02:26 UTCEPSS rescore
  37. 2026-08-01 04:15 UTCEPSS rescore
  38. 2026-07-30 01:30 UTCEPSS rescore
  39. 2026-07-27 14:13 UTCEPSS rescore
  40. 2026-07-26 14:54 UTCEPSS rescore
  41. 2026-07-26 14:54 UTCEPSS rescore
  42. 2026-07-25 14:17 UTCEPSS rescore
  43. 2026-07-25 14:17 UTCEPSS rescore
  44. 2026-07-24 14:17 UTCEPSS rescore
  45. 2026-07-23 14:18 UTCEPSS rescore
  46. 2026-07-23 14:18 UTCEPSS rescore
  47. 2026-07-23 11:19 UTCOSV refresh
  48. 2026-07-23 03:06 UTCEG score recompute
  49. 2026-07-22 14:08 UTCEPSS rescore
  50. 2026-07-21 15:24 UTCEPSS rescore
  51. 2026-07-21 15:24 UTCEPSS rescore
  52. 2026-07-20 17:08 UTCEPSS rescore
  53. 2026-07-19 14:31 UTCEPSS rescore
  54. 2026-07-19 14:31 UTCEPSS rescore
  55. 2026-07-19 02:29 UTCEPSS rescore
  56. 2026-07-19 02:28 UTCEPSS rescore
  57. 2026-07-18 10:04 UTCEPSS rescore
  58. 2026-07-18 10:04 UTCEPSS rescore
  59. 2026-07-16 17:03 UTCEPSS rescore
  60. 2026-07-16 17:03 UTCEPSS rescore
  61. 2026-07-15 16:57 UTCEPSS rescore
  62. 2026-07-15 16:57 UTCEPSS rescore
  63. 2026-07-15 02:21 UTCNVD updateCVSS v3 → 7.8
  64. 2026-07-15 02:06 UTCMITRE cvelistV5CVSS v3 → 8.6
  65. 2026-07-15 02:00 UTCEPSS rescore
  66. 2026-07-15 02:00 UTCEPSS rescore
  67. 2026-07-14 17:20 UTCNVD updateCVSS v3 → 7.8
  68. 2026-07-14 16:10 UTCMITRE cvelistV5CVSS v3 → 8.6
  69. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 7.8
  70. 2026-07-14 13:11 UTCMITRE cvelistV5CVSS v3 → 8.6
  71. 2026-07-13 22:30 UTCEPSS rescore
  72. 2026-07-13 06:13 UTCEPSS rescore
  73. 2026-07-13 06:13 UTCEPSS rescore
  74. 2026-07-12 05:46 UTCEPSS rescore
  75. 2026-07-12 05:46 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-22184?
CVE-2026-22184 is a critical vulnerability published on January 7, 2026. zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz…
When was CVE-2026-22184 disclosed?
CVE-2026-22184 was first published in the National Vulnerability Database on January 7, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-22184 actively exploited?
CVE-2026-22184 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 63.6% of all scored CVEs.
What is the CVSS score of CVE-2026-22184?
CVE-2026-22184 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-22184?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-22184, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-22184

Explore →

Is Your Infrastructure Affected by CVE-2026-22184?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs