Home/CVE/A ReDoS issue was discovered in the Time component through 0.2.1 in Ruby through 3.2.1. The Time parser mishandles inval
CVE

CVE-2023-28756

A ReDoS issue was discovered in the Time component through 0.2.1 in Ruby through 3.2.1. The Time parser mishandles inval

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.

MEDIUM · CVSS 5.3 EPSS 0.00651
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-1333Inefficient Regular Expression Complexity
▤

Affected Products & Versions

4
ruby-lang ruby<= 2.7.7
ruby-lang timeall versions
debian linuxall versions
fedoraproject fedoraall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
RubyGems time HIGH fixed in 0.2.2
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumRuby on Rails Framework Exceptions
productmediumPotential Ruby Reverse Shell
productmediumRuby Inline Command Execution
producthighAccount Created And Deleted Within A Close Time Frame
producthighFirst Time Seen Remote Named Pipe - Zeek
producthighTime Travel Debugging Utility Usage
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD31 Mar 2023 · 04:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

15
rhsaRHSA-2026:7307Moderate
rhsaRHSA-2026:8838Moderate
rhsaRHSA-2026:7305Moderate
rhsaRHSA-2024:3838Moderate
rhsaRHSA-2024:3500Moderate
🔗

References & Sources

11
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/ruby/time/releases/Release Notes
https://lists.debian.org/debian-lts-announce/2023/04/msg00033.htmlMailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z/
https://security.gentoo.org/glsa/202401-27
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