RHSA-2026:50778: ruby security update

RHSA-2026:50778, released June 22, 2026, fixes 5 CVEs in ruby (version 3.3.12-14.el10_2). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

7.3

Base score, 0 to 10

Highest EPSS

0.0083

57th percentile

Priority of the 5 CVEs

Patch now 0
                                Urgent 0
                                High 5
                                Routine 0

Fixed package versions

Product	Release	Fixed in
ruby	RHEL 10	3.3.12-14.el10_2

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-47240	Net::IMAP: Command Injection via non-synchronizing literal in "raw" argument	7.3	0.0083	None reported
High	CVE-2026-27820	zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption	7.3	0.0056	None reported
High	CVE-2026-42257	net-imap: Command Injection via "raw" arguments to multiple commands	7.3	0.0043	None reported
High	CVE-2026-47241	Net::IMAP: Denial of Service via incomplete raw argument validation	7.3	0.0038	None reported
High	CVE-2026-42256	net-imap: Denial of service via high iteration count for `SCRAM-*` authentication	7.3	0.0030	None reported

Also fixes CVE-2026-47240

OPENSUSE-SU-2026:21878-1
ruby3.4 on opensuse-leap 16.0
RHSA-2026:50828
ruby, ruby-bundled-gems, ruby-default-gems and 25 more on RHEL 9
RHSA-2026:50728
ruby, ruby-bundled-gems, ruby-default-gems and 27 more on RHEL 8
RLSA-2026:50773
ruby4.0 on rocky 10
RLSA-2026:50778
ruby on rocky 10
RLSA-2026:50828
ruby, rubygem-mysql2, rubygem-pg on rocky 9
RLSA-2026:50728
ruby, rubygem-abrt, rubygem-mysql2 and 1 more on rocky 8
ELSA-2026-50773
ruby4.0, ruby4.0-devel, ruby4.0-doc and 2 more on ol 10

Vendor advisory

https://access.redhat.com/errata/RHSA-2026:50778

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