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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 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)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

March 29, 2026

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated Aug 31, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
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

perldelta - what is new for perl v5.42.2 - metacpan.org

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

perldelta - what is new for perl v5.40.4 - metacpan.org

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/
github_commit

commit c75ae9cc1642 (Perl/perl5)

Fix landed in Perl/perl5 commit c75ae9cc1642 — awaiting tagged release

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.

Affected Packages

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
perl—5.42.2-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
perl—5.10.0-21—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
perl—5.10.0-21—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
perl—5.10.0-21—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
perl—5.10.0-21—

Data Freshness Timeline

(refreshed 7× in last 7d / 61× 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 194 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-02 13:04 UTCOSV refresh
  4. 2026-09-01 13:54 UTCEPSS rescore
  5. 2026-09-01 04:40 UTCEPSS rescore
  6. 2026-08-30 19:17 UTCEPSS rescore
  7. 2026-08-30 01:22 UTCEPSS rescore
  8. 2026-08-28 21:41 UTCEPSS rescore
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-25 13:49 UTCEPSS rescore
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-21 23:49 UTCEPSS rescore
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-19 17:04 UTCEPSS rescore
  16. 2026-08-18 13:48 UTCEPSS rescore
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 09:49 UTCEG score recompute
  20. 2026-08-16 09:49 UTCGHSA enrichment
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 01:30 UTCEPSS rescore
  23. 2026-08-14 23:47 UTCGHSA enrichment
  24. 2026-08-14 19:25 UTCGHSA enrichment
  25. 2026-08-14 14:58 UTCGHSA enrichment
Show 75 more
  1. 2026-08-14 10:36 UTCGHSA enrichment
  2. 2026-08-14 06:11 UTCEG score recompute
  3. 2026-08-14 06:11 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 00:52 UTCGHSA enrichment
  6. 2026-08-12 20:30 UTCEG score recompute
  7. 2026-08-12 20:30 UTCGHSA enrichment
  8. 2026-08-12 13:51 UTCEPSS rescore
  9. 2026-08-12 01:09 UTCGHSA enrichment
  10. 2026-08-11 20:41 UTCEG score recompute
  11. 2026-08-11 20:40 UTCGHSA enrichment
  12. 2026-08-11 08:16 UTCGHSA enrichment
  13. 2026-08-11 03:41 UTCEG score recompute
  14. 2026-08-11 03:41 UTCGHSA enrichment
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-10 11:59 UTCGHSA enrichment
  17. 2026-08-10 06:31 UTCGHSA enrichment
  18. 2026-08-10 02:09 UTCGHSA enrichment
  19. 2026-08-09 21:46 UTCGHSA enrichment
  20. 2026-08-09 17:24 UTCEG score recompute
  21. 2026-08-09 17:24 UTCGHSA enrichment
  22. 2026-08-09 13:46 UTCEPSS rescore
  23. 2026-08-09 13:03 UTCGHSA enrichment
  24. 2026-08-09 05:45 UTCEG score recompute
  25. 2026-08-09 05:45 UTCGHSA enrichment
  26. 2026-08-08 16:37 UTCEPSS rescore
  27. 2026-08-08 09:24 UTCGHSA enrichment
  28. 2026-08-08 05:02 UTCGHSA enrichment
  29. 2026-08-08 00:40 UTCGHSA enrichment
  30. 2026-08-07 20:18 UTCEG score recompute
  31. 2026-08-07 20:18 UTCGHSA enrichment
  32. 2026-08-07 15:57 UTCGHSA enrichment
  33. 2026-08-06 18:29 UTCEG score recompute
  34. 2026-08-06 18:29 UTCGHSA enrichment
  35. 2026-08-06 13:47 UTCEPSS rescore
  36. 2026-08-06 09:25 UTCGHSA enrichment
  37. 2026-08-06 05:03 UTCGHSA enrichment
  38. 2026-08-06 00:41 UTCEG score recompute
  39. 2026-08-06 00:41 UTCGHSA enrichment
  40. 2026-08-05 19:17 UTCEPSS rescore
  41. 2026-08-04 15:10 UTCEPSS rescore
  42. 2026-08-04 10:39 UTCEPSS rescore
  43. 2026-08-04 03:55 UTCGHSA enrichment
  44. 2026-08-03 23:01 UTCGHSA enrichment
  45. 2026-08-02 23:50 UTCGHSA enrichment
  46. 2026-08-02 19:28 UTCGHSA enrichment
  47. 2026-08-02 15:06 UTCEG score recompute
  48. 2026-08-02 15:06 UTCGHSA enrichment
  49. 2026-08-02 02:27 UTCEPSS rescore
  50. 2026-08-01 04:16 UTCEPSS rescore
  51. 2026-07-30 16:28 UTCEPSS rescore
  52. 2026-07-30 01:30 UTCEPSS rescore
  53. 2026-07-28 15:37 UTCEPSS rescore
  54. 2026-07-26 14:54 UTCEPSS rescore
  55. 2026-07-25 14:18 UTCEPSS rescore
  56. 2026-07-24 14:18 UTCEPSS rescore
  57. 2026-07-23 14:18 UTCEPSS rescore
  58. 2026-07-23 03:11 UTCEG score recompute
  59. 2026-07-22 14:08 UTCEPSS rescore
  60. 2026-07-21 15:25 UTCEPSS rescore
  61. 2026-07-20 17:08 UTCEPSS rescore
  62. 2026-07-19 14:31 UTCEPSS rescore
  63. 2026-07-19 14:31 UTCEPSS rescore
  64. 2026-07-19 02:29 UTCEPSS rescore
  65. 2026-07-18 10:04 UTCEPSS rescore
  66. 2026-07-17 13:59 UTCOSV refresh
  67. 2026-07-16 17:03 UTCEPSS rescore
  68. 2026-07-15 16:57 UTCEPSS rescore
  69. 2026-07-15 16:57 UTCEPSS rescore
  70. 2026-07-15 02:00 UTCEPSS rescore
  71. 2026-07-13 22:30 UTCEPSS rescore
  72. 2026-07-13 06:13 UTCEPSS rescore
  73. 2026-07-12 05:46 UTCEPSS rescore
  74. 2026-07-11 08:27 UTCEPSS rescore
  75. 2026-07-09 19:10 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 June 17, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 48.2% of all scored CVEs.
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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