UnratedFix available
Fix CVE(s): CVE-2026-55956, CVE-2026-55957
Type: advisorySources: OSV
* SECURITY UPDATE: authentication bypass in JNDIRealm with GSSAPI - debian/patches/CVE-2026-55957.patch: don't reuse GSSAPI SASL auth when validating user credentials in java/org/apache/catalina/realm/JNDIRealm.java - CVE-2026-55957 * SECURITY UPDATE: default servlet security constraint method bypass - debian/patches/CVE-2026-55956.patch: honour per-method constraints mapped to "/" in java/org/apache/catalina/realm/RealmBase.java - CVE-2026-55956
- Products
- libtomcat8-embed-java, libtomcat8-java, tomcat8, tomcat8-admin, tomcat8-common, tomcat8-docs, tomcat8-examples, tomcat8-user
- Affected versions
- Not specified
- Fixed versions
- 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
- CVEs
- CVE-2026-55956, CVE-2026-55957
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:41 UTC · Revision 1
Source evidence
* SECURITY UPDATE: authentication bypass in JNDIRealm with GSSAPI - debian/patches/CVE-2026-55957.patch: don't reuse GSSAPI SASL auth when validating user credentials in java/org/apache/catalina/realm/JNDIRealm.java - CVE-2026-55957 * SECURITY UPDATE: default servlet security constraint method bypass - debian/patches/CVE-2026-55956.patch: honour per-method constraints mapped to "/" in java/org/apache/catalina/realm/RealmBase.java - CVE-2026-55956
osv:CLSA-2026-1783352184
libtomcat8-embed-java
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
libtomcat8-java
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
tomcat8
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
tomcat8-admin
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
tomcat8-common
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
tomcat8-docs
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
tomcat8-examples
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
tomcat8-user
Fixed versions: 8.5.100-1ubuntu1~18.04.1+tuxcare.els4
Complete source record
{
"id": "6bf78532515afe05059add69f27668d0399705cf3d16264e63b8ceef1cf524a2",
"url": "https://osv.dev/vulnerability/CLSA-2026-1783352184",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-55956, CVE-2026-55957",
"summary": "* SECURITY UPDATE: authentication bypass in JNDIRealm with GSSAPI - debian/patches/CVE-2026-55957.patch: don't reuse GSSAPI SASL auth when validating user credentials in java/org/apache/catalina/realm/JNDIRealm.java - CVE-2026-55957 * SECURITY UPDATE: default servlet security constraint method bypass - debian/patches/CVE-2026-55956.patch: honour per-method constraints mapped to \"/\" in java/org/apache/catalina/realm/RealmBase.java - CVE-2026-55956",
"evidence": "osv:CLSA-2026-1783352184",
"products": [
{
"name": {
"value": "libtomcat8-embed-java",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libtomcat8-java",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat8",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat8-admin",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat8-common",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat8-docs",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat8-examples",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat8-user",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1783352184",
"aliases": [
"CLSA-2026-1783352184"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "libtomcat8-embed-java",
"purl": "pkg:deb/tuxcare/libtomcat8-embed-java?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "libtomcat8-java",
"purl": "pkg:deb/tuxcare/libtomcat8-java?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "tomcat8",
"purl": "pkg:deb/tuxcare/tomcat8?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "tomcat8-admin",
"purl": "pkg:deb/tuxcare/tomcat8-admin?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "tomcat8-common",
"purl": "pkg:deb/tuxcare/tomcat8-common?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "tomcat8-docs",
"purl": "pkg:deb/tuxcare/tomcat8-docs?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "tomcat8-examples",
"purl": "pkg:deb/tuxcare/tomcat8-examples?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.5.100-1ubuntu1~18.04.1+tuxcare.els4"
}
]
}
],
"package": {
"name": "tomcat8-user",
"purl": "pkg:deb/tuxcare/tomcat8-user?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1783352184.json"
}
}
],
"modified": "2026-10-26T09:32:03.333633032Z",
"provider": "osv",
"upstream": [
"CVE-2026-55956",
"CVE-2026-55957"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1783352184.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55956",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55957"
]
},
"related_cves": [
{
"value": "CVE-2026-55956",
"evidence": "/upstream"
},
{
"value": "CVE-2026-55957",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449519,
"published_at": "2026-07-06T15:36:49+00:00"
}