Arbitrary Argument Injection Affecting ruby4.0 package, versions <0:4.0.0-33.3.hum1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-RUBY40-16079975
- published16 Apr 2026
- disclosed1 Jan 2015
Introduced: 1 Jan 2015
CVE-2015-9096 (opens in a new tab)How to fix?
Upgrade RHEL:10 ruby4.0 to version 0:4.0.0-33.3.hum1 or higher.
This issue was patched in RHSA-2026:8838.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby4.0 package and not the ruby4.0 package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
Net::SMTP in Ruby before 2.4.0 is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1461846
- https://access.redhat.com/security/cve/CVE-2015-9096
- https://access.redhat.com/errata/RHSA-2026:7305
- https://access.redhat.com/errata/RHSA-2026:7307
- https://access.redhat.com/errata/RHSA-2026:8838
- http://www.mbsd.jp/Whitepaper/smtpi.pdf
- https://github.com/ruby/ruby/commit/0827a7e52ba3d957a634b063bf5a391239b9ffee
- https://github.com/rubysec/ruby-advisory-db/issues/215
- https://hackerone.com/reports/137631
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://www.debian.org/security/2017/dsa-3966