CVE-2023-28756

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 29% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

A ReDoS issue was discovered in the Time component through 0.2.1 in Ruby through 3.2.1. The Time parser mishandles invalid URLs that have specific characters. It causes an increase in execution time for parsing strings to Time objects. The fixed versions are 0.1.1 and 0.2.2.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
82.7%
KEV
Not listed

Published

March 31, 2023

Last Modified

November 4, 2025

References (21)

Vendor Advisories for CVE-2023-28756(3)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubunturuby2.3-doc (2.3.1-2~ubuntu16.04.16+esm5) @ xenial2026-05-25ubuntu
ubunturuby2.3-doc (2.3.1-2~ubuntu16.04.16+esm7) @ xenial2026-05-25ubuntu
ubunturuby3.1-dev (3.1.2-6ubuntu0.23.04.1) @ lunar2026-05-25ubuntu
redhatruby4-0-main-4.0.0-33.3.hum12026-04-17redhat
redhatruby3-3-main-3.3.10-23.1.hum12026-04-09redhat
redhatruby3-4-main-3.4.8-31.1.hum12026-04-09redhat
redhatruby-0:3.0.7-162.el9_42024-06-11redhat
redhatruby:3.0-8100020240522072634.489197e62024-05-30redhat
redhatruby:3.1-9030020240320163942.92024-04-01redhat
redhatruby:3.1-8090020240311122605.a75119d52024-03-19redhat
redhatruby:2.5-8090020230627084142.b46abd142023-11-14redhat
redhatruby:2.7-8080020230427102918.63b345852023-06-27redhat
redhatrh-ruby27-ruby-0:2.7.8-132.el72023-05-24redhat

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

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
time0.1.00.1.1—

Weakness Classification(1)

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

Additional Vendor Advisories

(10)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 48× 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 105 total refreshes for this CVE.

  1. 2026-07-22 14:06 UTCEPSS rescore
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-21 15:23 UTCEPSS rescore
  4. 2026-07-20 17:06 UTCEPSS rescore
  5. 2026-07-19 14:29 UTCEPSS rescore
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  11. 2026-07-16 17:01 UTCEPSS rescore
  12. 2026-07-16 17:01 UTCEPSS rescore
  13. 2026-07-16 00:53 UTCOSV refresh
  14. 2026-07-15 16:56 UTCEPSS rescore
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  16. 2026-07-15 01:58 UTCEPSS rescore
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  20. 2026-07-13 06:11 UTCEPSS rescore
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  22. 2026-07-12 05:45 UTCEPSS rescore
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  25. 2026-07-09 19:08 UTCEPSS rescore
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  1. 2026-07-09 19:08 UTCEPSS rescore
  2. 2026-07-08 15:13 UTCEPSS rescore
  3. 2026-07-07 13:44 UTCEPSS rescore
  4. 2026-07-06 16:26 UTCEPSS rescore
  5. 2026-07-06 16:26 UTCEPSS rescore
  6. 2026-07-05 02:28 UTCEPSS rescore
  7. 2026-07-04 06:29 UTCEPSS rescore
  8. 2026-07-02 16:59 UTCEPSS rescore
  9. 2026-07-01 15:04 UTCEPSS rescore
  10. 2026-06-30 23:21 UTCEPSS rescore
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  12. 2026-06-29 14:05 UTCEPSS rescore
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  15. 2026-06-28 04:54 UTCEPSS rescore
  16. 2026-06-28 01:34 UTCOSV refresh
  17. 2026-06-27 03:07 UTCEPSS rescore
  18. 2026-06-25 13:48 UTCEPSS rescore
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  20. 2026-06-24 14:03 UTCEPSS rescore
  21. 2026-06-24 14:03 UTCEPSS rescore
  22. 2026-06-23 21:31 UTCEPSS rescore
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  24. 2026-06-22 14:24 UTCEPSS rescore
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  26. 2026-06-21 14:55 UTCEPSS rescore
  27. 2026-06-21 14:55 UTCEPSS rescore
  28. 2026-06-21 01:58 UTCEPSS rescore
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  30. 2026-06-19 19:24 UTCEPSS rescore
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  32. 2026-06-18 17:51 UTCEPSS rescore
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  38. 2026-06-15 17:47 UTCEPSS rescore
  39. 2026-06-14 23:16 UTCEPSS rescore
  40. 2026-06-13 22:59 UTCEPSS rescore
  41. 2026-06-13 22:59 UTCEPSS rescore
  42. 2026-06-12 23:10 UTCEPSS rescore
  43. 2026-06-11 13:59 UTCEPSS rescore
  44. 2026-06-10 22:17 UTCEPSS rescore
  45. 2026-06-10 13:21 UTCEPSS rescore
  46. 2026-06-10 13:21 UTCEPSS rescore
  47. 2026-06-10 12:17 UTCOSV refresh
  48. 2026-06-08 14:15 UTCEPSS rescore
  49. 2026-06-08 14:15 UTCEPSS rescore
  50. 2026-06-07 15:23 UTCEPSS rescore
  51. 2026-06-07 15:23 UTCEPSS rescore
  52. 2026-06-06 13:46 UTCEPSS rescore
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  54. 2026-06-05 22:46 UTCEPSS rescore
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  56. 2026-06-05 06:09 UTCEPSS rescore
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  58. 2026-06-04 13:11 UTCEPSS rescore
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  60. 2026-06-02 20:12 UTCEPSS rescore
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  63. 2026-06-01 13:51 UTCEPSS rescore
  64. 2026-05-31 22:29 UTCEPSS rescore
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  67. 2026-05-31 00:15 UTCEPSS rescore
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  69. 2026-05-29 13:43 UTCEPSS rescore
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  72. 2026-05-27 13:39 UTCEPSS rescore
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  74. 2026-05-26 13:43 UTCEPSS rescore
  75. 2026-05-26 13:43 UTCEPSS rescore

Frequently asked(5)

What is CVE-2023-28756?
CVE-2023-28756 is a medium vulnerability published on March 31, 2023. A ReDoS issue was discovered in the Time component through 0.2.1 in Ruby through 3.2.1. The Time parser mishandles invalid URLs that have specific characters. It causes an increase in execution time for parsing strings to Time objects. The fixed versions are 0.1.1 and 0.2.2.
When was CVE-2023-28756 disclosed?
CVE-2023-28756 was first published in the National Vulnerability Database on March 31, 2023, with the most recent update on November 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-28756 actively exploited?
CVE-2023-28756 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 82.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-28756?
CVE-2023-28756 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-28756?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-28756, 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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