# CVE-2025-0306: Ruby: openssl: ruby marvin attack

Status: published. Published: 2025-01-09. Updated: 2026-11-05.

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.

## Remediation

- workaround: See the following possible mitigations for this flaw:

* Do not use the methods with PKCS#1v1.5 padding in network contexts. Make sure that any calls that happen, will perform OAEP decryption only. Do not support PKCS#1v1.5 encryption padding at all.

* Use Ruby with a version of OpenSSL that has the implicit rejection mechanism implemented.(https://github.com/openssl/openssl/pull/13817, https://github.com/openssl/openssl/commit/7fc67e0a33102aa47bbaa56533eeecb98c0450f7 included in 3.2.0, backported to RHEL-8) (source: CNA: redhat)

## Affected products and versions

-  /  (Ruby): ≥ 0; < * (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (ruby:2.5/ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (ruby:3.1/ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (ruby:3.3/ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (ruby:3.1/ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (ruby:3.3/ruby): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Storage 3 (ruby): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.66% as of 2026-11-05; percentile 51.65%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-385

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2025-0306 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2336100 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://security.netapp.com/advisory/ntap-20250221-0009/ (ADP: CVE)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-0306; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-0306; retrieved 2026-11-05; source updated Not reported

Revision: 5d2ffb1531e01c9620a9170f766d6152b7fc2724060831c1eebf8df1a8dded82

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