alsa-2026:50773
Vulnerability from osv_almalinux
Published
2026-08-05 00:00
Modified
2026-09-14 08:24
Summary
Important: ruby4.0 security, bug fix, and enhancement update
Details
Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, and extensible.
Security Fix(es):
- zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader (CVE-2026-27820)
- net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input (CVE-2026-42257)
- ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication (CVE-2026-42256)
- net-imap: Net::IMAP: Command injection via non-synchronizing literals (CVE-2026-47240)
- net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation (CVE-2026-47242)
- net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input (CVE-2026-47241)
Bug Fix(es) and Enhancement(s):
- ruby4.0: Rebase to the latest Ruby 4.0 release [almalinux-10.2.z] (JIRA:AlmaLinux-211310)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
References
{
"affected": [
{
"package": {
"ecosystem": "AlmaLinux:10",
"name": "ruby4.0"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.0.6-36.el10_2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:10",
"name": "ruby4.0-devel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.0.6-36.el10_2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:10",
"name": "ruby4.0-doc"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.0.6-36.el10_2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:10",
"name": "ruby4.0-rubygem-mysql2"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.7-36.el10_2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:10",
"name": "ruby4.0-rubygem-pg"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.3-36.el10_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"details": "Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, and extensible. \n\nSecurity Fix(es): \n\n * zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader (CVE-2026-27820)\n * net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input (CVE-2026-42257)\n * ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication (CVE-2026-42256)\n * net-imap: Net::IMAP: Command injection via non-synchronizing literals (CVE-2026-47240)\n * net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation (CVE-2026-47242)\n * net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input (CVE-2026-47241)\n\n\nBug Fix(es) and Enhancement(s): \n\n * ruby4.0: Rebase to the latest Ruby 4.0 release [almalinux-10.2.z] (JIRA:AlmaLinux-211310)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
"id": "ALSA-2026:50773",
"modified": "2026-09-14T08:24:38Z",
"published": "2026-08-05T00:00:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://access.redhat.com/errata/RHSA-2026:50773"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-27820"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-42256"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-42257"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-47240"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-47241"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-47242"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2459002"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2468494"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2468500"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2491519"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2491523"
},
{
"type": "ADVISORY",
"url": "https://errata.almalinux.org/10/ALSA-2026-50773.html"
}
],
"related": [
"CVE-2026-27820",
"CVE-2026-42257",
"CVE-2026-42256",
"CVE-2026-47240",
"CVE-2026-47242",
"CVE-2026-47241"
],
"summary": "Important: ruby4.0 security, bug fix, and enhancement update"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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