Vulnerability Report

CVE-2023-28756

Title: ReDoS in Ruby Time component

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2023-28756.

CWE Category CWE-1333

Published Date Mar 31, 2023

Modified Date Nov 04, 2025

Exploit Status Not Found

Score 5.3 CVSS v3.1

Exploit Probability (EPSS)

0.65%

Vulnerability Summary

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 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.

Impacted Vendors

yukihiro_matsumoto 1

ruby-lang 2

time_project 1

Reference Links

https://github.com/ruby/time/releases/ https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html 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 https://security.netapp.com/advisory/ntap-20230526-0004/ https://www.ruby-lang.org/en/downloads/releases/ https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/ https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/ https://github.com/ruby/time/releases/ https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html 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 https://security.netapp.com/advisory/ntap-20230526-0004/ https://www.ruby-lang.org/en/downloads/releases/ https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/ https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2023-28756 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

November 04, 2025 MODIFIED

Vulnerability data or affected products updated.

March 31, 2023 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected Stack

No specific products linked.