UnratedFix available
tomcat: Fix of 5 CVEs
Type: advisorySources: OSV
- CVE-2026-55955: add replay protection to the cluster EncryptInterceptor by encrypting a trusted timestamp with each message and rejecting duplicate, stale or future messages via the new replayWindowTime and replayWindowMessageCount attributes (upstream tomcat 9.0.119). The default encryptionAlgorithm also changes from AES/CBC/PKCS5Padding to AES/GCM/NoPadding, because the replay protection is only effective for non-malleable algorithms. NOTE: this changes the encrypted cluster message format, so a cluster using EncryptInterceptor must be restarted as a whole, not node by node
- 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.els12
- CVEs
- CVE-2026-55955
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:52 UTC · Revision 1
Source evidence
- CVE-2026-55955: add replay protection to the cluster EncryptInterceptor by encrypting a trusted timestamp with each message and rejecting duplicate, stale or future messages via the new replayWindowTime and replayWindowMessageCount attributes (upstream tomcat 9.0.119). The default encryptionAlgorithm also changes from AES/CBC/PKCS5Padding to AES/GCM/NoPadding, because the replay protection is only effective for non-malleable algorithms. NOTE: this changes the encrypted cluster message format, so a cluster using EncryptInterceptor must be restarted as a whole, not node by node
osv:CLSA-2026-1785497476
tomcat
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
tomcat-admin-webapps
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
tomcat-docs-webapp
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
tomcat-el-3.0-api
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
tomcat-jsp-2.3-api
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
tomcat-lib
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
tomcat-servlet-4.0-api
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
tomcat-webapps
Fixed versions: 1:9.0.87-3.el9_6.3.tuxcare.els12
Complete source record
{
"id": "b7471c476b1c3489ad8d454bf8e7f7d9a51755831498c59c68b1fefb75d4b2da",
"url": "https://osv.dev/vulnerability/CLSA-2026-1785497476",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "tomcat: Fix of 5 CVEs",
"summary": "- CVE-2026-55955: add replay protection to the cluster EncryptInterceptor by encrypting a trusted timestamp with each message and rejecting duplicate, stale or future messages via the new replayWindowTime and replayWindowMessageCount attributes (upstream tomcat 9.0.119). The default encryptionAlgorithm also changes from AES/CBC/PKCS5Padding to AES/GCM/NoPadding, because the replay protection is only effective for non-malleable algorithms. NOTE: this changes the encrypted cluster message format, so a cluster using EncryptInterceptor must be restarted as a whole, not node by node",
"evidence": "osv:CLSA-2026-1785497476",
"products": [
{
"name": {
"value": "tomcat",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.0.87-3.el9_6.3.tuxcare.els12",
"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.els12",
"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.els12",
"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.els12",
"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.els12",
"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.els12",
"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.els12",
"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.els12",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1785497476",
"aliases": [
"CLSA-2026-1785497476"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.0.87-3.el9_6.3.tuxcare.els12"
}
]
}
],
"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-2026-1785497476.json"
}
}
],
"modified": "2026-10-26T09:31:22.232391166Z",
"provider": "osv",
"upstream": [
"CVE-2026-55955"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1785497476.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-24880",
"https://nvd.nist.gov/vuln/detail/CVE-2026-25854",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34483",
"https://nvd.nist.gov/vuln/detail/CVE-2026-53404",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55955"
]
},
"related_cves": [
{
"value": "CVE-2026-55955",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447618,
"published_at": "2026-07-31T11:31:29+00:00"
}