UnratedFix available
ruby: Fix of CVE-2026-27820
Type: advisorySources: OSV
- CVE-2026-27820: fix buffer overflow in Zlib::GzipReader#ungetc - Skip unresolvable GIDs in TestProcess#test_execopts_gid (build env workaround)
- Products
- ruby, ruby-devel, ruby-doc, ruby-irb, ruby-libs, ruby-tcltk, rubygem-bigdecimal, rubygem-io-console, rubygem-json, rubygem-minitest, rubygem-psych, rubygem-rake, rubygem-rdoc, rubygems, rubygems-devel
- Affected versions
- Not specified
- Fixed versions
- 0.4.2-39.el7_9.tuxcare.els13, 0.9.6-39.el7_9.tuxcare.els13, 1.2.0-39.el7_9.tuxcare.els13, 1.7.7-39.el7_9.tuxcare.els13, 2.0.0-39.el7_9.tuxcare.els13, 2.0.0.648-39.el7_9.tuxcare.els13, 2.0.14.1-39.el7_9.tuxcare.els13, 4.0.0-39.el7_9.tuxcare.els13, 4.3.2-39.el7_9.tuxcare.els13
- CVEs
- CVE-2026-27820
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:02 UTC · Revision 1
Source evidence
- CVE-2026-27820: fix buffer overflow in Zlib::GzipReader#ungetc - Skip unresolvable GIDs in TestProcess#test_execopts_gid (build env workaround)
osv:CLSA-2026-1786470325
ruby
Fixed versions: 2.0.0.648-39.el7_9.tuxcare.els13
ruby-devel
Fixed versions: 2.0.0.648-39.el7_9.tuxcare.els13
ruby-doc
Fixed versions: 2.0.0.648-39.el7_9.tuxcare.els13
ruby-irb
Fixed versions: 2.0.0.648-39.el7_9.tuxcare.els13
ruby-libs
Fixed versions: 2.0.0.648-39.el7_9.tuxcare.els13
ruby-tcltk
Fixed versions: 2.0.0.648-39.el7_9.tuxcare.els13
rubygem-bigdecimal
Fixed versions: 1.2.0-39.el7_9.tuxcare.els13
rubygem-io-console
Fixed versions: 0.4.2-39.el7_9.tuxcare.els13
rubygem-json
Fixed versions: 1.7.7-39.el7_9.tuxcare.els13
rubygem-minitest
Fixed versions: 4.3.2-39.el7_9.tuxcare.els13
rubygem-psych
Fixed versions: 2.0.0-39.el7_9.tuxcare.els13
rubygem-rake
Fixed versions: 0.9.6-39.el7_9.tuxcare.els13
rubygem-rdoc
Fixed versions: 4.0.0-39.el7_9.tuxcare.els13
rubygems
Fixed versions: 2.0.14.1-39.el7_9.tuxcare.els13
rubygems-devel
Fixed versions: 2.0.14.1-39.el7_9.tuxcare.els13
Complete source record
{
"id": "9e5f61534de2282ee7ae60e805a99266be73eaedb172c14604f526b81e0552ed",
"url": "https://osv.dev/vulnerability/CLSA-2026-1786470325",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ruby: Fix of CVE-2026-27820",
"summary": "- CVE-2026-27820: fix buffer overflow in Zlib::GzipReader#ungetc - Skip unresolvable GIDs in TestProcess#test_execopts_gid (build env workaround)",
"evidence": "osv:CLSA-2026-1786470325",
"products": [
{
"name": {
"value": "ruby",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.0.648-39.el7_9.tuxcare.els13",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-devel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.0.648-39.el7_9.tuxcare.els13",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-doc",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.0.648-39.el7_9.tuxcare.els13",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-irb",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-libs",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.0.648-39.el7_9.tuxcare.els13",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-tcltk",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.0.648-39.el7_9.tuxcare.els13",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygem-bigdecimal",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.2.0-39.el7_9.tuxcare.els13",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygem-io-console",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.4.2-39.el7_9.tuxcare.els13",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygem-json",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.7.7-39.el7_9.tuxcare.els13",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygem-minitest",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.3.2-39.el7_9.tuxcare.els13",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygem-psych",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.0-39.el7_9.tuxcare.els13",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygem-rake",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.6-39.el7_9.tuxcare.els13",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygem-rdoc",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.0.0-39.el7_9.tuxcare.els13",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygems",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.14.1-39.el7_9.tuxcare.els13",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "rubygems-devel",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.0.14.1-39.el7_9.tuxcare.els13",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1786470325",
"aliases": [
"CLSA-2026-1786470325"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.0.648-39.el7_9.tuxcare.els13"
}
]
}
],
"package": {
"name": "ruby",
"purl": "pkg:rpm/tuxcare/ruby?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2.0.0.648-39.el7_9.tuxcare.els13"
}
]
}
],
"package": {
"name": "ruby-devel",
"purl": "pkg:rpm/tuxcare/ruby-devel?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
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{
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],
"package": {
"name": "ruby-doc",
"purl": "pkg:rpm/tuxcare/ruby-doc?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.0.648-39.el7_9.tuxcare.els13"
}
]
}
],
"package": {
"name": "ruby-irb",
"purl": "pkg:rpm/tuxcare/ruby-irb?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.0.648-39.el7_9.tuxcare.els13"
}
]
}
],
"package": {
"name": "ruby-libs",
"purl": "pkg:rpm/tuxcare/ruby-libs?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.0.648-39.el7_9.tuxcare.els13"
}
]
}
],
"package": {
"name": "ruby-tcltk",
"purl": "pkg:rpm/tuxcare/ruby-tcltk?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.0-39.el7_9.tuxcare.els13"
}
]
}
],
"package": {
"name": "rubygem-bigdecimal",
"purl": "pkg:rpm/tuxcare/rubygem-bigdecimal?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
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}
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}
],
"package": {
"name": "rubygem-io-console",
"purl": "pkg:rpm/tuxcare/rubygem-io-console?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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},
{
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]
}
],
"package": {
"name": "rubygem-json",
"purl": "pkg:rpm/tuxcare/rubygem-json?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
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]
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],
"package": {
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"purl": "pkg:rpm/tuxcare/rubygem-minitest?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
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}
},
{
"ranges": [
{
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{
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},
{
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}
]
}
],
"package": {
"name": "rubygem-psych",
"purl": "pkg:rpm/tuxcare/rubygem-psych?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
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},
{
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}
]
}
],
"package": {
"name": "rubygem-rake",
"purl": "pkg:rpm/tuxcare/rubygem-rake?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "rubygem-rdoc",
"purl": "pkg:rpm/tuxcare/rubygem-rdoc?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "rubygems",
"purl": "pkg:rpm/tuxcare/rubygems?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.14.1-39.el7_9.tuxcare.els13"
}
]
}
],
"package": {
"name": "rubygems-devel",
"purl": "pkg:rpm/tuxcare/rubygems-devel?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786470325.json"
}
}
],
"modified": "2026-10-26T09:31:42.607078284Z",
"provider": "osv",
"upstream": [
"CVE-2026-27820"
],
"references": [
"https://errata.tuxcare.com/els_os/centos7els/CLSA-2026-1786470325.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-27820"
]
},
"related_cves": [
{
"value": "CVE-2026-27820",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448192,
"published_at": "2026-08-13T12:42:16+00:00"
}