VulnerabilityPublished 31 Mar 2023Updated 4 Nov 2025

CVE-2023-28756: CVE-2023-28756 is a Regular Expression Denial of Service (ReDoS) vulnerability in the Time component

Source CVE Database V5

Not known to be exploited · fixed in 0.1.1 : update Time component affecting when convenient.

Data as of 26 Oct 2026, 08:30 UTC

Severity

Medium

Rated Medium by the CNA (mitre) · No CVSS score from NVD or the CNA

EPSS: 2.4% chance of exploitation in 30 days – higher than 84% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Affects: Time component affecting up to 0.2.1
Patch: Available – fixed in 0.1.1

Exploitation evidence

Disclosed: evidence found.
CVE published 31 Mar 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

Upgrade to fixed versions 0.1.1 or 0.2.2 of the Time component to remediate this vulnerability. No other mitigations are indicated.

Description

CVE-2023-28756 is a Regular Expression Denial of Service (ReDoS) vulnerability in the Time component affecting versions up to 0.2.1. The issue arises from the Time parser mishandling invalid URLs containing specific characters, leading to increased execution time when parsing strings into Time objects. The vulnerability has been fixed in versions 0.1.1 and 0.2.2.

Impact

An attacker can exploit this vulnerability by supplying specially crafted input strings that cause the Time parser to consume excessive CPU resources, potentially leading to denial of service due to increased execution time. There is no indication of code execution or data leakage.

Summary

This vulnerability involves a ReDoS condition in the Time component through version 0.2.1, including Ruby versions up to 3.2.1. The Time parser improperly processes certain invalid URL strings, causing excessive execution time during parsing operations. The issue is resolved in fixed versions 0.1.1 and 0.2.2.

References

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