UnratedFix available
Fix CVE(s): CVE-2026-59083
Type: advisorySources: OSV
* SECURITY UPDATE: Security constraint bypass in the RewriteValve - the decoded and normalized request URI used for subsequent security constraint matching was produced with java.net.URLDecoder.decode(), which applies form-encoding rules and converts '+' to a space instead of performing proper URI percent-decoding - debian/patches/CVE-2026-59083.patch: use Tomcat's UDecoder.URLDecode() (already imported and used elsewhere in the class) instead of java.net.URLDecoder.decode() to build the decoded request URI - CVE-2026-59083
- Products
- libtomcat9-embed-java, libtomcat9-java, tomcat9, tomcat9-admin, tomcat9-common, tomcat9-docs, tomcat9-examples, tomcat9-user
- Affected versions
- Not specified
- Fixed versions
- 9.0.31-1~deb10u12+tuxcare.els7
- CVEs
- CVE-2026-59083
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:22 UTC · Revision 1
Source evidence
* SECURITY UPDATE: Security constraint bypass in the RewriteValve - the decoded and normalized request URI used for subsequent security constraint matching was produced with java.net.URLDecoder.decode(), which applies form-encoding rules and converts '+' to a space instead of performing proper URI percent-decoding - debian/patches/CVE-2026-59083.patch: use Tomcat's UDecoder.URLDecode() (already imported and used elsewhere in the class) instead of java.net.URLDecoder.decode() to build the decoded request URI - CVE-2026-59083
osv:CLSA-2026-1786352989
libtomcat9-embed-java
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
libtomcat9-java
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
tomcat9
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
tomcat9-admin
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
tomcat9-common
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
tomcat9-docs
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
tomcat9-examples
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
tomcat9-user
Fixed versions: 9.0.31-1~deb10u12+tuxcare.els7
Complete source record
{
"id": "8ade1d3659a56e4ad90ddc4a89e6dca3680d1b0fbc012dbad971d2e42bf6db0b",
"url": "https://osv.dev/vulnerability/CLSA-2026-1786352989",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-59083",
"summary": "* SECURITY UPDATE: Security constraint bypass in the RewriteValve - the decoded and normalized request URI used for subsequent security constraint matching was produced with java.net.URLDecoder.decode(), which applies form-encoding rules and converts '+' to a space instead of performing proper URI percent-decoding - debian/patches/CVE-2026-59083.patch: use Tomcat's UDecoder.URLDecode() (already imported and used elsewhere in the class) instead of java.net.URLDecoder.decode() to build the decoded request URI - CVE-2026-59083",
"evidence": "osv:CLSA-2026-1786352989",
"products": [
{
"name": {
"value": "libtomcat9-embed-java",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libtomcat9-java",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9-admin",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9-common",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9-docs",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9-examples",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tomcat9-user",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1~deb10u12+tuxcare.els7",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1786352989",
"aliases": [
"CLSA-2026-1786352989"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "libtomcat9-embed-java",
"purl": "pkg:deb/tuxcare/libtomcat9-embed-java?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "libtomcat9-java",
"purl": "pkg:deb/tuxcare/libtomcat9-java?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "tomcat9",
"purl": "pkg:deb/tuxcare/tomcat9?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "tomcat9-admin",
"purl": "pkg:deb/tuxcare/tomcat9-admin?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "tomcat9-common",
"purl": "pkg:deb/tuxcare/tomcat9-common?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "tomcat9-docs",
"purl": "pkg:deb/tuxcare/tomcat9-docs?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "tomcat9-examples",
"purl": "pkg:deb/tuxcare/tomcat9-examples?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1~deb10u12+tuxcare.els7"
}
]
}
],
"package": {
"name": "tomcat9-user",
"purl": "pkg:deb/tuxcare/tomcat9-user?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786352989.json"
}
}
],
"modified": "2026-10-26T09:31:52.975930970Z",
"provider": "osv",
"upstream": [
"CVE-2026-59083"
],
"references": [
"https://errata.tuxcare.com/els_os/debian10els/CLSA-2026-1786352989.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-59083"
]
},
"related_cves": [
{
"value": "CVE-2026-59083",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448814,
"published_at": "2026-08-10T09:09:59+00:00"
}