UnratedFix available
tomcat: Fix of 2 CVEs
Type: advisorySources: OSV
- CVE-2026-55957: don't reuse GSSAPI SASL authentication when validating user-provided credentials in JNDIRealm, closing an LDAP bind authentication bypass (upstream tomcat 9.0.102) - CVE-2026-55956: honour per-method security constraints mapped to "/" so method omissions on the default servlet are no longer ignored (upstream tomcat 9.0.119)
- Products
- tomcat, tomcat-admin-webapps, tomcat-docs-webapp, tomcat-el-3.0-api, tomcat-jsp-2.3-api, tomcat-lib, tomcat-servlet-4.0-api, tomcat-webapps
- Affected versions
- Not specified
- Fixed versions
- 1:9.0.87-3.el9_6.3.tuxcare.els9
- CVEs
- CVE-2026-55956, CVE-2026-55957
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:55 UTC · Revision 1
Source evidence
- CVE-2026-55957: don't reuse GSSAPI SASL authentication when validating user-provided credentials in JNDIRealm, closing an LDAP bind authentication bypass (upstream tomcat 9.0.102) - CVE-2026-55956: honour per-method security constraints mapped to "/" so method omissions on the default servlet are no longer ignored (upstream tomcat 9.0.119)
osv:CLSA-2026-1783356847
tomcat
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
tomcat-admin-webapps
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
tomcat-docs-webapp
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
tomcat-el-3.0-api
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
tomcat-jsp-2.3-api
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
tomcat-lib
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
tomcat-servlet-4.0-api
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
tomcat-webapps
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els9
Complete source record
{
"id": "f1a6af390a86be699b8016ff0bc18813b08ad87dd227fb03678a3b3b52573747",
"url": "https://osv.dev/vulnerability/CLSA-2026-1783356847",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "tomcat: Fix of 2 CVEs",
"summary": "- CVE-2026-55957: don't reuse GSSAPI SASL authentication when validating user-provided credentials in JNDIRealm, closing an LDAP bind authentication bypass (upstream tomcat 9.0.102) - CVE-2026-55956: honour per-method security constraints mapped to \"/\" so method omissions on the default servlet are no longer ignored (upstream tomcat 9.0.119)",
"evidence": "osv:CLSA-2026-1783356847",
"products": [
{
"name": {
"value": "tomcat",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat-admin-webapps",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat-docs-webapp",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat-el-3.0-api",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat-jsp-2.3-api",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat-lib",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat-servlet-4.0-api",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat-webapps",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els9",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1783356847",
"aliases": [
"CLSA-2026-1783356847"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els9"
}
]
}
],
"package": {
"name": "tomcat",
"purl": "pkg:rpm/tuxcare/tomcat?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-2026-1783356847.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els9"
}
]
}
],
"package": {
"name": "tomcat-admin-webapps",
"purl": "pkg:rpm/tuxcare/tomcat-admin-webapps?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-2026-1783356847.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els9"
}
]
}
],
"package": {
"name": "tomcat-docs-webapp",
"purl": "pkg:rpm/tuxcare/tomcat-docs-webapp?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-2026-1783356847.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "tomcat-el-3.0-api",
"purl": "pkg:rpm/tuxcare/tomcat-el-3.0-api?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-2026-1783356847.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els9"
}
]
}
],
"package": {
"name": "tomcat-jsp-2.3-api",
"purl": "pkg:rpm/tuxcare/tomcat-jsp-2.3-api?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-2026-1783356847.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els9"
}
]
}
],
"package": {
"name": "tomcat-lib",
"purl": "pkg:rpm/tuxcare/tomcat-lib?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-2026-1783356847.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els9"
}
]
}
],
"package": {
"name": "tomcat-servlet-4.0-api",
"purl": "pkg:rpm/tuxcare/tomcat-servlet-4.0-api?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-2026-1783356847.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els9"
}
]
}
],
"package": {
"name": "tomcat-webapps",
"purl": "pkg:rpm/tuxcare/tomcat-webapps?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-2026-1783356847.json"
}
}
],
"modified": "2026-10-26T09:43:46.907843304Z",
"provider": "osv",
"upstream": [
"CVE-2026-55956",
"CVE-2026-55957"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1783356847.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": 450137,
"published_at": "2026-07-06T16:54:25+00:00"
}