CVE-2025-46551: JRuby-OpenSSL is an add-on gem for JRuby that emulates the Ruby OpenSSL native library

This week

LOW 3.7REMOTEWATCHLISTUPGRADEUPGRADE

CVE-2025-46551 is a low-severity flaw (CVSS 3.7) affecting jruby, jruby-openssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JRuby-OpenSSL is an add-on gem for JRuby that emulates the Ruby OpenSSL native library. Starting in JRuby-OpenSSL version 0.12.1 and prior to version 0.15.4 (corresponding to JRuby versions starting in 9.3.4.0 prior to 9.4.12.1 and 10.0.0.0 prior to 10.0.0.1), when verifying SSL certificates, JRuby-OpenSSL does not verify that the hostname presented in the certificate matches the one the user tries to connect to. This means a man-in-the-middle co

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-295
Published	2025-05-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: jruby

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-07 17:15 UTCPublished CVE record published
2026-06-17 09:26 UTCUpdated Record last modified

jruby jruby UPGRADE

Affected: >= 9.3.4.0 and < 9.4.12.1 · 10.0.0.0

Fixed in: 9.4.12.1

Safe to downgrade to: a release before 9.3.4.0

1. Check installed version

apt-cache policy jruby || rpm -q jruby || jruby --version

2. UPGRADE to 9.4.12.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jruby

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jruby

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 9.3.4.0 (Debian / Ubuntu)

apt-cache madison jruby sudo apt install jruby=<VERSION_BEFORE_9.3.4.0> sudo apt-mark hold jruby

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jruby sudo dnf downgrade jruby-<VERSION_BEFORE_9.3.4.0> sudo dnf versionlock add jruby

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

jruby jruby-openssl UPGRADE

Affected: >= 0.12.1 and < 0.15.4

Fixed in: 0.15.4

Safe to downgrade to: a release before 0.12.1

1. Check installed version

apt-cache policy jruby-openssl || rpm -q jruby-openssl || jruby-openssl --version

2. UPGRADE to 0.15.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jruby-openssl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jruby-openssl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.12.1 (Debian / Ubuntu)

apt-cache madison jruby-openssl sudo apt install jruby-openssl=<VERSION_BEFORE_0.12.1> sudo apt-mark hold jruby-openssl

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jruby-openssl sudo dnf downgrade jruby-openssl-<VERSION_BEFORE_0.12.1> sudo dnf versionlock add jruby-openssl

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-46551?

jruby: upgrade to 9.4.12.1; jruby-openssl: upgrade to 0.15.4. Exact commands for each OS are on this page.

Is CVE-2025-46551 being exploited?

CVE-2025-46551 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-46551 affect?

CVE-2025-46551 affects jruby, jruby-openssl. Severity is low (CVSS 3.7). JRuby-OpenSSL is an add-on gem for JRuby that emulates the Ruby OpenSSL native library. Starting in JRuby-OpenSSL version 0.12.1 and prior to version 0.15.4 (corresponding to JRuby versions starting in 9.3.4.0 prior to 9.4.12.1 and 10.0.0.0

How urgent is CVE-2025-46551?

Priority 30/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities · Ruby vulnerabilities

References

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