7.4

CVE-2025-0306: ruby-3.2 Covert Timing Channel

CVSS: 7.4v3.1HighDeferred
AliasesDEBIAN-CVE-2025-0306CGA-3649-9p44-4v75CGA-c6mh-m979-9j2h
Published 09-01-2025Last modified 29-06-2026
Open JSON

Vulnerability summary

CVE-2025-0306 is a high (CVSS 7.4) Covert Timing Channel vulnerability in ruby-3.2. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.66%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 3
CGA-R26W-V6GV-M844CGA-W39W-H4JJ-9R57UBUNTU-CVE-2025-0306

Timeline

  1. 09-01-2025
    PublishedVulnerability first disclosed.
  2. 29-06-2026
    Last modifiedVulnerability information updated.

Description

A vulnerability was found in Ruby. The Ruby interpreter is vulnerable to the Marvin Attack. This attack allows the attacker to decrypt previously encrypted messages or forge signatures by exchanging a large number of messages with the vulnerable service.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

+0.01 pp

From 0.65% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.66%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard1 product
  • ruby-3.2All versions (No fix recorded)
Debian1 product
  • ruby3.1All versions (No fix recorded)
Wolfi1 product
  • ruby-3.2All versions (No fix recorded)

3 vendors · 3 products

References

4 links