CVE-2026-45191

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-05-10. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass.

Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value.

See also CVE-2026-45190.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

May 10, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated May 11, 2026
No patch confirmed yet.
generic
https://www.cve.org/CVERecord?id=CVE-2026-45190
generic

Changes - metacpan.org

https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes
generic
https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibnet-cidr-lite-perl (0.22-2ubuntu0.25.10.2) @ questing2026-08-23ubuntu

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

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
perl-net-cidr-lite—0.24-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-lite-perl0.22-1 ... 0.24-1 (9 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-lite-perl0.22-2, 0.22-3~deb12u10.22-3~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-lite-perl0.22-2, 0.22-3~deb12u1, 0.22-3~deb12u2, 0.22-3~deb13u10.22-3~deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-lite-perl0.22-2 ... 0.23-1 (7 versions)0.24-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 28× 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 202 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45191?
CVE-2026-45191 is a medium vulnerability published on May 10, 2026. Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.
When was CVE-2026-45191 disclosed?
CVE-2026-45191 was first published in the National Vulnerability Database on May 10, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45191 actively exploited?
CVE-2026-45191 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 77.2% of all scored CVEs.
What is the CVSS score of CVE-2026-45191?
CVE-2026-45191 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-45191?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45191, 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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