CVE-2026-49940

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-04. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
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

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

Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks.

Unicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers. This could allow network masks to accept larger networks.

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
9%
KEV
Not listed

Published

June 4, 2026

Last Modified

July 22, 2026

Advisory Details (1)

Auto-updated Jun 13, 2026
No patch confirmed yet.
generic

Client Challenge

https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes

Vendor Advisories for CVE-2026-49940(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-set-perl0.13-3 ... 0.22-1 (8 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-set-perl0.13-4 ... 0.22-1 (7 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-set-perl0.15-1 ... 0.22-1 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libnet-cidr-set-perl0.15-1, 0.19-1, 0.20-10.21-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 65× 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 166 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-49940?
CVE-2026-49940 is a medium vulnerability published on June 4, 2026. Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks. Unicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers. This could allow network masks to accept larger networks.
When was CVE-2026-49940 disclosed?
CVE-2026-49940 was first published in the National Vulnerability Database on June 4, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49940 actively exploited?
CVE-2026-49940 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 90.7% of all scored CVEs.
What is the CVSS score of CVE-2026-49940?
CVE-2026-49940 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-49940?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49940, 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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