CVE-2026-4176

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-29. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

Perl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulnerable version of Compress::Raw::Zlib.

Compress::Raw::Zlib is included in the Perl package as a dual-life core module, and is vulnerable to CVE-2026-3381 due to a vendored version of zlib which has several vulnerabilities, including CVE-2026-27171. The bundled Compress::Raw::Zlib was updated to version 2.221 in Perl blead commit c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
48.1%
KEV
Not listed

Published

March 29, 2026

Last Modified

April 22, 2026

Advisory Details (7)

Auto-updated May 12, 2026
No patch confirmed yet.
generic

oss-security - Re: CVE-2026-4176: Perl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulnerable version of Compress::Raw::Zlib

http://www.openwall.com/lists/oss-security/2026/03/30/2
generic
https://www.cve.org/CVERecord?id=CVE-2026-3381
generic

Client Challenge

https://metacpan.org/release/SHAY/perl-5.42.2/changes
generic

Client Challenge

https://metacpan.org/release/SHAY/perl-5.40.4/changes
generic

Client Challenge

https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes
generic

CVE-2026-3381: Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib | Simplelists

https://lists.security.metacpan.org/cve-announce/msg/37638919/
generic

cpan/Compress-Raw-Zlib - Update to version 2.221 · Perl/perl5@c75ae9c · GitHub

https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94

Vendor Advisories for CVE-2026-4176(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 38× 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 125 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-4176?
CVE-2026-4176 is a critical vulnerability published on March 29, 2026. Perl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulnerable version of Compress::Raw::Zlib. Compress::Raw::Zlib is included in the Perl package as a dual-life core module, and is vulnerable to CVE-2026-3381 due to a vendored version of…
When was CVE-2026-4176 disclosed?
CVE-2026-4176 was first published in the National Vulnerability Database on March 29, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4176 actively exploited?
CVE-2026-4176 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-4176?
CVE-2026-4176 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-4176?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4176, 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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