UnratedFix available
krb5: Fix of 2 CVEs
Type: advisorySources: OSV
- CVE-2026-40355: fix NULL pointer dereference in NegoEx parse_nego_message() - CVE-2026-40356: fix integer underflow and OOB read in NegoEx parse_message()
- Products
- krb5-devel, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, krb5-tests, krb5-workstation, libkadm5
- Affected versions
- Not specified
- Fixed versions
- 1.21.1-8.el9_6.tuxcare.els1
- CVEs
- CVE-2026-40355, CVE-2026-40356
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:49 UTC · Revision 1
Source evidence
- CVE-2026-40355: fix NULL pointer dereference in NegoEx parse_nego_message() - CVE-2026-40356: fix integer underflow and OOB read in NegoEx parse_message()
osv:CLSA-2026-1780398100
krb5-devel
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
krb5-libs
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
krb5-pkinit
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
krb5-server
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
krb5-server-ldap
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
krb5-tests
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
krb5-workstation
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
libkadm5
Fixed versions: 1.21.1-8.el9_6.tuxcare.els1
Complete source record
{
"id": "cc98cb638b309c6e365377feba4dd5cbfab55e88d61c60c35331e49eadd036e7",
"url": "https://osv.dev/vulnerability/CLSA-2026-1780398100",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "krb5: Fix of 2 CVEs",
"summary": "- CVE-2026-40355: fix NULL pointer dereference in NegoEx parse_nego_message() - CVE-2026-40356: fix integer underflow and OOB read in NegoEx parse_message()",
"evidence": "osv:CLSA-2026-1780398100",
"products": [
{
"name": {
"value": "krb5-devel",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-libs",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-pkinit",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-server",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-server-ldap",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-tests",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-workstation",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libkadm5",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.21.1-8.el9_6.tuxcare.els1",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1780398100",
"aliases": [
"CLSA-2026-1780398100"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "krb5-devel",
"purl": "pkg:rpm/tuxcare/krb5-devel?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "krb5-libs",
"purl": "pkg:rpm/tuxcare/krb5-libs?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "krb5-pkinit",
"purl": "pkg:rpm/tuxcare/krb5-pkinit?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "krb5-server",
"purl": "pkg:rpm/tuxcare/krb5-server?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "krb5-server-ldap",
"purl": "pkg:rpm/tuxcare/krb5-server-ldap?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "krb5-tests",
"purl": "pkg:rpm/tuxcare/krb5-tests?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "krb5-workstation",
"purl": "pkg:rpm/tuxcare/krb5-workstation?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.21.1-8.el9_6.tuxcare.els1"
}
]
}
],
"package": {
"name": "libkadm5",
"purl": "pkg:rpm/tuxcare/libkadm5?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780398100.json"
}
}
],
"modified": "2026-10-26T09:31:06.759840440Z",
"provider": "osv",
"upstream": [
"CVE-2026-40355",
"CVE-2026-40356"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1780398100.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-40355",
"https://nvd.nist.gov/vuln/detail/CVE-2026-40356"
]
},
"related_cves": [
{
"value": "CVE-2026-40355",
"evidence": "/upstream"
},
{
"value": "CVE-2026-40356",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447450,
"published_at": "2026-06-02T11:01:54+00:00"
}