UnratedFix available
krb5: Fix of 5 CVEs
Type: advisorySources: OSV
- CVE-2025-24528: prevent overflow when calculating ulog block size - CVE-2025-3576: don't issue session keys with deprecated enctypes (RC4-HMAC-MD5 spoofing) - CVE-2026-40355: fix NULL pointer dereference in NegoEx parse_nego_message - CVE-2026-40356: fix integer underflow in NegoEx parse_message header_len - CVE-2023-36054: ensure array count consistency in kadm5 RPC to prevent freeing uninitialized pointers in _xdr_kadm5_principal_ent_rec
- Products
- krb5-devel, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, krb5-workstation, libkadm5
- Affected versions
- Not specified
- Fixed versions
- 1.18.2-27.el8.tuxcare.els2
- CVEs
- CVE-2023-36054, CVE-2025-24528, CVE-2025-3576, CVE-2026-40355, CVE-2026-40356
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:47 UTC · Revision 1
Source evidence
- CVE-2025-24528: prevent overflow when calculating ulog block size - CVE-2025-3576: don't issue session keys with deprecated enctypes (RC4-HMAC-MD5 spoofing) - CVE-2026-40355: fix NULL pointer dereference in NegoEx parse_nego_message - CVE-2026-40356: fix integer underflow in NegoEx parse_message header_len - CVE-2023-36054: ensure array count consistency in kadm5 RPC to prevent freeing uninitialized pointers in _xdr_kadm5_principal_ent_rec
osv:CLSA-2026-1779875639
krb5-devel
Fixed versions: 1.18.2-27.el8.tuxcare.els2
krb5-libs
Fixed versions: 1.18.2-27.el8.tuxcare.els2
krb5-pkinit
Fixed versions: 1.18.2-27.el8.tuxcare.els2
krb5-server
Fixed versions: 1.18.2-27.el8.tuxcare.els2
krb5-server-ldap
Fixed versions: 1.18.2-27.el8.tuxcare.els2
krb5-workstation
Fixed versions: 1.18.2-27.el8.tuxcare.els2
libkadm5
Fixed versions: 1.18.2-27.el8.tuxcare.els2
Complete source record
{
"id": "b61a61defb6bbc45d8de8395b17c73ef2e2efacb8e1958bc561d587c85763265",
"url": "https://osv.dev/vulnerability/CLSA-2026-1779875639",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "krb5: Fix of 5 CVEs",
"summary": "- CVE-2025-24528: prevent overflow when calculating ulog block size - CVE-2025-3576: don't issue session keys with deprecated enctypes (RC4-HMAC-MD5 spoofing) - CVE-2026-40355: fix NULL pointer dereference in NegoEx parse_nego_message - CVE-2026-40356: fix integer underflow in NegoEx parse_message header_len - CVE-2023-36054: ensure array count consistency in kadm5 RPC to prevent freeing uninitialized pointers in _xdr_kadm5_principal_ent_rec",
"evidence": "osv:CLSA-2026-1779875639",
"products": [
{
"name": {
"value": "krb5-devel",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.2-27.el8.tuxcare.els2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-libs",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.2-27.el8.tuxcare.els2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-pkinit",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.2-27.el8.tuxcare.els2",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-server",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.2-27.el8.tuxcare.els2",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-server-ldap",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.2-27.el8.tuxcare.els2",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "krb5-workstation",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.2-27.el8.tuxcare.els2",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libkadm5",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.2-27.el8.tuxcare.els2",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1779875639",
"aliases": [
"CLSA-2026-1779875639"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.2-27.el8.tuxcare.els2"
}
]
}
],
"package": {
"name": "krb5-devel",
"purl": "pkg:rpm/tuxcare/krb5-devel?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1779875639.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.2-27.el8.tuxcare.els2"
}
]
}
],
"package": {
"name": "krb5-libs",
"purl": "pkg:rpm/tuxcare/krb5-libs?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1779875639.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.2-27.el8.tuxcare.els2"
}
]
}
],
"package": {
"name": "krb5-pkinit",
"purl": "pkg:rpm/tuxcare/krb5-pkinit?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1779875639.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.2-27.el8.tuxcare.els2"
}
]
}
],
"package": {
"name": "krb5-server",
"purl": "pkg:rpm/tuxcare/krb5-server?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1779875639.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.2-27.el8.tuxcare.els2"
}
]
}
],
"package": {
"name": "krb5-server-ldap",
"purl": "pkg:rpm/tuxcare/krb5-server-ldap?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1779875639.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.2-27.el8.tuxcare.els2"
}
]
}
],
"package": {
"name": "krb5-workstation",
"purl": "pkg:rpm/tuxcare/krb5-workstation?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1779875639.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.2-27.el8.tuxcare.els2"
}
]
}
],
"package": {
"name": "libkadm5",
"purl": "pkg:rpm/tuxcare/libkadm5?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1779875639.json"
}
}
],
"modified": "2026-10-26T09:43:19.111601002Z",
"provider": "osv",
"upstream": [
"CVE-2023-36054",
"CVE-2025-24528",
"CVE-2025-3576",
"CVE-2026-40355",
"CVE-2026-40356"
],
"references": [
"https://errata.tuxcare.com/els_os/centos-stream8els/CLSA-2026-1779875639.html"
]
},
"related_cves": [
{
"value": "CVE-2023-36054",
"evidence": "/upstream"
},
{
"value": "CVE-2025-24528",
"evidence": "/upstream"
},
{
"value": "CVE-2025-3576",
"evidence": "/upstream"
},
{
"value": "CVE-2026-40355",
"evidence": "/upstream"
},
{
"value": "CVE-2026-40356",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449835,
"published_at": "2026-05-27T09:54:03+00:00"
}