Most severe vulnerabilities for "ruby ruby"

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3.1

Mastodon MastodonMastodon: SSRF protection bypass on older Ruby versions

Risk 49

Severity

8.6

Infoleak, SSRF

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, when using Ruby versions older than 3.4, PrivateAddressCheck.privateaddress? returns false for IPv4-mapped IPv6 addresses (::ffff:a.b.c.d) corresponding to some private IPv4 addresses, depending on Ruby version, this can include loopback, RFC1918 private networks, and link-local space. An attacker who controls DNS for any domain can publish an AAAA record with such a mapped address; any outbound HTTP fetch Mastodon performs against that hostname then opens a real TCP connection to the underlying IPv4 address, including 127.0.0.1 and cloud-metadata endpoints such as 169.254.169.254. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.

First published (updated )

CVE-2026-47389

Ruby RubyRuby: openssl: ruby marvin attack

Risk 41

Severity

7.4

EPSS

0.09%

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

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Source: NVD

First published (updated )

CVE-2025-0306

Ruby RubyOriginally, Common Vulnerabilities and Exposures assigned an identifier of CVE-2011-1005 to the foll…

Risk 5

Severity

Originally, Common Vulnerabilities and Exposures assigned an identifier of CVE-2011-1005 to the following vulnerability:

The safe-level feature in Ruby 1.8.6 through 1.8.6-420, 1.8.7 through 1.8.7-330, and 1.8.8dev allows context-dependent attackers to modify strings via the Exception#tos method, as demonstrated by changing an intended pathname.

with the following upstream patch: [1] http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?revision=30903&view=revision

Based on later upstream patch for different (CVE-2012-4464 and CVE-2012-4466) issues: [2] http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=37068

it was found that original upstream 1.8.x ruby patch for CVE-2011-1005 issue was not complete, when the NameError#tos() method was used on / with Ruby objects (the test logic in 'testtostaintnesspropagation' test from [1] was actually reversed, so the test returned success also on still vulnerable instances).

Acknowledgements:

This issue was discovered by Vit Ondruch of Red Hat.

First published (updated )

REDHAT-BUG-863484