UnratedFix available
Fix CVE(s): CVE-2026-55957
Type: advisorySources: OSV
* SECURITY UPDATE: JNDIRealm credential validation bypass when configured to use GSSAPI - debian/patches/CVE-2026-55957.patch: in bindAsUser preserve the current SASL environment, move userCredentialsAdd inside the try, strip Context.SECURITY_AUTHENTICATION="GSSAPI" before the LDAP bind so the provided username/password are actually validated, and restore the original SASL setting in a finally block along with userCredentialsRemove. Also updates docs/config/realm.xml to document that GSSAPI is skipped for calls made via HttpServletRequest.login(String, String). - CVE-2026-55957
- Products
- libtomcat9-embed-java, libtomcat9-java, tomcat9, tomcat9-admin, tomcat9-common, tomcat9-docs, tomcat9-examples, tomcat9-user
- Affected versions
- Not specified
- Fixed versions
- 9.0.31-1ubuntu0.9+tuxcare.els5
- CVEs
- CVE-2026-55957
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:44 UTC · Revision 1
Source evidence
* SECURITY UPDATE: JNDIRealm credential validation bypass when configured to use GSSAPI - debian/patches/CVE-2026-55957.patch: in bindAsUser preserve the current SASL environment, move userCredentialsAdd inside the try, strip Context.SECURITY_AUTHENTICATION="GSSAPI" before the LDAP bind so the provided username/password are actually validated, and restore the original SASL setting in a finally block along with userCredentialsRemove. Also updates docs/config/realm.xml to document that GSSAPI is skipped for calls made via HttpServletRequest.login(String, String). - CVE-2026-55957
osv:CLSA-2026-1784541319
libtomcat9-embed-java
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
libtomcat9-java
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
tomcat9
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
tomcat9-admin
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
tomcat9-common
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
tomcat9-docs
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
tomcat9-examples
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
tomcat9-user
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els5
Complete source record
{
"id": "15982c2c35e604bb87c1fc38072540ae3e0b3eb9c3b3fffa099ae65f8aa27dda",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784541319",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-55957",
"summary": "* SECURITY UPDATE: JNDIRealm credential validation bypass when configured to use GSSAPI - debian/patches/CVE-2026-55957.patch: in bindAsUser preserve the current SASL environment, move userCredentialsAdd inside the try, strip Context.SECURITY_AUTHENTICATION=\"GSSAPI\" before the LDAP bind so the provided username/password are actually validated, and restore the original SASL setting in a finally block along with userCredentialsRemove. Also updates docs/config/realm.xml to document that GSSAPI is skipped for calls made via HttpServletRequest.login(String, String). - CVE-2026-55957",
"evidence": "osv:CLSA-2026-1784541319",
"products": [
{
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"evidence": "/affected/0/package/name"
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"evidence": "/affected/0/ranges"
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{
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{
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{
"name": {
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{
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"evidence": "/affected/3/ranges"
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"affected_versions": []
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{
"name": {
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"affected_versions": []
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{
"name": {
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"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9-examples",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1ubuntu0.9+tuxcare.els5",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9-user",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1ubuntu0.9+tuxcare.els5",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784541319",
"aliases": [
"CLSA-2026-1784541319"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1ubuntu0.9+tuxcare.els5"
}
]
}
],
"package": {
"name": "libtomcat9-embed-java",
"purl": "pkg:deb/tuxcare/libtomcat9-embed-java?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1784541319.json"
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
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{
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],
"package": {
"name": "libtomcat9-java",
"purl": "pkg:deb/tuxcare/libtomcat9-java?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1784541319.json"
}
},
{
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}
],
"package": {
"name": "tomcat9",
"purl": "pkg:deb/tuxcare/tomcat9?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
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}
},
{
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{
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}
]
}
],
"package": {
"name": "tomcat9-admin",
"purl": "pkg:deb/tuxcare/tomcat9-admin?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1784541319.json"
}
},
{
"ranges": [
{
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{
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}
]
}
],
"package": {
"name": "tomcat9-common",
"purl": "pkg:deb/tuxcare/tomcat9-common?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1784541319.json"
}
},
{
"ranges": [
{
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{
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],
"package": {
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"purl": "pkg:deb/tuxcare/tomcat9-docs?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1784541319.json"
}
},
{
"ranges": [
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},
{
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}
]
}
],
"package": {
"name": "tomcat9-examples",
"purl": "pkg:deb/tuxcare/tomcat9-examples?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1784541319.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1ubuntu0.9+tuxcare.els5"
}
]
}
],
"package": {
"name": "tomcat9-user",
"purl": "pkg:deb/tuxcare/tomcat9-user?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1784541319.json"
}
}
],
"modified": "2026-10-26T09:32:05.587352108Z",
"provider": "osv",
"upstream": [
"CVE-2026-55957"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1784541319.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55957"
]
},
"related_cves": [
{
"value": "CVE-2026-55957",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449704,
"published_at": "2026-07-20T09:55:41+00:00"
}