Fix CVE(s): CVE-2024-56337
* SECURITY UPDATE: fix for the following CVEs: - CVE-2024-56337: incomplete mitigation of CVE-2024-50379 — the JVM global canonical file name cache (sun.io.useCanonCaches) could still return a stale answer for a concurrently written path, leaving the TOCTOU race during JSP compilation exploitable on case-insensitive file systems with a write-enabled Default Servlet. DirResourceSet now verifies at startup that the cache is disabled, disabling it reflectively where possible and refusing to start the potentially vulnerable web application otherwise; new Jre12Compat and Jre21Compat tiers implement the per-JRE detection, and catalina.sh sets -Dsun.io.useCanonCaches=false before the JVM caches it.
- 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.els8
- CVEs
- CVE-2024-50379, CVE-2024-56337
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:49 UTC · Revision 1
Source evidence
* SECURITY UPDATE: fix for the following CVEs: - CVE-2024-56337: incomplete mitigation of CVE-2024-50379 — the JVM global canonical file name cache (sun.io.useCanonCaches) could still return a stale answer for a concurrently written path, leaving the TOCTOU race during JSP compilation exploitable on case-insensitive file systems with a write-enabled Default Servlet. DirResourceSet now verifies at startup that the cache is disabled, disabling it reflectively where possible and refusing to start the potentially vulnerable web application otherwise; new Jre12Compat and Jre21Compat tiers implement the per-JRE detection, and catalina.sh sets -Dsun.io.useCanonCaches=false before the JVM caches it.
osv:CLSA-2026-1786720463
libtomcat9-embed-java
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
libtomcat9-java
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
tomcat9
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
tomcat9-admin
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
tomcat9-common
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
tomcat9-docs
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
tomcat9-examples
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
tomcat9-user
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els8
Complete source record
{
"id": "1caab25faea808a8ca0e19f9b918753a2d991c64486748b16a11a1bdda546b27",
"url": "https://osv.dev/vulnerability/CLSA-2026-1786720463",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2024-56337",
"summary": "* SECURITY UPDATE: fix for the following CVEs: - CVE-2024-56337: incomplete mitigation of CVE-2024-50379 — the JVM global canonical file name cache (sun.io.useCanonCaches) could still return a stale answer for a concurrently written path, leaving the TOCTOU race during JSP compilation exploitable on case-insensitive file systems with a write-enabled Default Servlet. DirResourceSet now verifies at startup that the cache is disabled, disabling it reflectively where possible and refusing to start the potentially vulnerable web application otherwise; new Jre12Compat and Jre21Compat tiers implement the per-JRE detection, and catalina.sh sets -Dsun.io.useCanonCaches=false before the JVM caches it.",
"evidence": "osv:CLSA-2026-1786720463",
"products": [
{
"name": {
"value": "libtomcat9-embed-java",
"evidence": "/affected/0/package/name"
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"fixed_versions": [
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"value": "9.0.31-1ubuntu0.9+tuxcare.els8",
"evidence": "/affected/0/ranges"
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},
{
"name": {
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"evidence": "/affected/1/package/name"
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"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1ubuntu0.9+tuxcare.els8",
"evidence": "/affected/1/ranges"
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"affected_versions": []
},
{
"name": {
"value": "tomcat9",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/2/ranges"
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],
"affected_versions": []
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{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1ubuntu0.9+tuxcare.els8",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1ubuntu0.9+tuxcare.els8",
"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.els8",
"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.els8",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1786720463",
"aliases": [
"CLSA-2026-1786720463"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1ubuntu0.9+tuxcare.els8"
}
]
}
],
"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-2026-1786720463.json"
}
},
{
"ranges": [
{
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"events": [
{
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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-2026-1786720463.json"
}
},
{
"ranges": [
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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-2026-1786720463.json"
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1ubuntu0.9+tuxcare.els8"
}
]
}
],
"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-2026-1786720463.json"
}
},
{
"ranges": [
{
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{
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}
]
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],
"package": {
"name": "tomcat9-docs",
"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-2026-1786720463.json"
}
},
{
"ranges": [
{
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{
"introduced": "0"
},
{
"fixed": "9.0.31-1ubuntu0.9+tuxcare.els8"
}
]
}
],
"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-2026-1786720463.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.31-1ubuntu0.9+tuxcare.els8"
}
]
}
],
"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-2026-1786720463.json"
}
}
],
"modified": "2026-10-26T09:43:27.498269853Z",
"provider": "osv",
"upstream": [
"CVE-2024-50379",
"CVE-2024-56337"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1786720463.html",
"https://nvd.nist.gov/vuln/detail/CVE-2024-56337"
]
},
"related_cves": [
{
"value": "CVE-2024-50379",
"evidence": "/upstream"
},
{
"value": "CVE-2024-56337",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449919,
"published_at": "2026-08-14T15:14:34+00:00"
}