Fix of 7 CVEs
* SECURITY UPDATE: fix for the following CVEs: - CVE-2025-48989: MadeYouReset HTTP/2 DoS — charge the connection overhead budget for server-initiated RST_STREAM frames in both Http2UpgradeHandler and Http2AsyncUpgradeHandler, and apply the initial HTTP/2 MAX_CONCURRENT_STREAMS and INITIAL_WINDOW_SIZE limits immediately (force-set) rather than only after the client ACKs the SETTINGS frame, closing the "malformed control frame -> server RST" amplification loop. - CVE-2025-55752: RewriteValve query-string-append (QSA) path traversal — swap the normalize/decode order in RewriteValve.invoke() so the rewritten URL is URL-decoded before normalisation, preventing encoded traversal sequences such as %2F..%2F from surviving normalize() and later reaching /WEB-INF/ or /META-INF/. - CVE-2026-29146: EncryptInterceptor padding oracle — validate the configured cluster encryptionAlgorithm against an allow-list. GCM is now only accepted with NoPadding; NONE, ECB, PCBC, CTS, KW, KWP and CTR are refused outright, as are CBC, CFB and OFB with NoPadding and CFB/OFB at a non-default block size (CFB8, OFB64, ...); an unusable algorithm raises IllegalArgumentException at startup instead of failing later. CBC, CFB and OFB with PKCS5Padding continue to work but log a warning recommending AES/GCM/NoPadding. The default encryptionAlgorithm also changes from AES/CBC/PKCS5Padding to the authenticated AES/GCM/NoPadding, which is what actually removes the padding oracle for the deployments that never set th
- 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.els7
- CVEs
- CVE-2025-48989, CVE-2025-55752, CVE-2026-29146
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:59 UTC · Revision 1
Source evidence
* SECURITY UPDATE: fix for the following CVEs: - CVE-2025-48989: MadeYouReset HTTP/2 DoS — charge the connection overhead budget for server-initiated RST_STREAM frames in both Http2UpgradeHandler and Http2AsyncUpgradeHandler, and apply the initial HTTP/2 MAX_CONCURRENT_STREAMS and INITIAL_WINDOW_SIZE limits immediately (force-set) rather than only after the client ACKs the SETTINGS frame, closing the "malformed control frame -> server RST" amplification loop. - CVE-2025-55752: RewriteValve query-string-append (QSA) path traversal — swap the normalize/decode order in RewriteValve.invoke() so the rewritten URL is URL-decoded before normalisation, preventing encoded traversal sequences such as %2F..%2F from surviving normalize() and later reaching /WEB-INF/ or /META-INF/. - CVE-2026-29146: EncryptInterceptor padding oracle — validate the configured cluster encryptionAlgorithm against an allow-list. GCM is now only accepted with NoPadding; NONE, ECB, PCBC, CTS, KW, KWP and CTR are refused outright, as are CBC, CFB and OFB with NoPadding and CFB/OFB at a non-default block size (CFB8, OFB64, ...); an unusable algorithm raises IllegalArgumentException at startup instead of failing later. CBC, CFB and OFB with PKCS5Padding continue to work but log a warning recommending AES/GCM/NoPadding. The default encryptionAlgorithm also changes from AES/CBC/PKCS5Padding to the authenticated AES/GCM/NoPadding, which is what actually removes the padding oracle for the deployments that never set th
osv:CLSA-2026-1786543355
libtomcat9-embed-java
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
libtomcat9-java
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
tomcat9
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
tomcat9-admin
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
tomcat9-common
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
tomcat9-docs
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
tomcat9-examples
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
tomcat9-user
Fixed versions: 9.0.31-1ubuntu0.9+tuxcare.els7
Complete source record
{
"id": "b31903200913b164d7b960312130c007eeac1a9f55fdb2bad20abb8197597ab7",
"url": "https://osv.dev/vulnerability/CLSA-2026-1786543355",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix of 7 CVEs",
"summary": "* SECURITY UPDATE: fix for the following CVEs: - CVE-2025-48989: MadeYouReset HTTP/2 DoS — charge the connection overhead budget for server-initiated RST_STREAM frames in both Http2UpgradeHandler and Http2AsyncUpgradeHandler, and apply the initial HTTP/2 MAX_CONCURRENT_STREAMS and INITIAL_WINDOW_SIZE limits immediately (force-set) rather than only after the client ACKs the SETTINGS frame, closing the \"malformed control frame -> server RST\" amplification loop. - CVE-2025-55752: RewriteValve query-string-append (QSA) path traversal — swap the normalize/decode order in RewriteValve.invoke() so the rewritten URL is URL-decoded before normalisation, preventing encoded traversal sequences such as %2F..%2F from surviving normalize() and later reaching /WEB-INF/ or /META-INF/. - CVE-2026-29146: EncryptInterceptor padding oracle — validate the configured cluster encryptionAlgorithm against an allow-list. GCM is now only accepted with NoPadding; NONE, ECB, PCBC, CTS, KW, KWP and CTR are refused outright, as are CBC, CFB and OFB with NoPadding and CFB/OFB at a non-default block size (CFB8, OFB64, ...); an unusable algorithm raises IllegalArgumentException at startup instead of failing later. CBC, CFB and OFB with PKCS5Padding continue to work but log a warning recommending AES/GCM/NoPadding. The default encryptionAlgorithm also changes from AES/CBC/PKCS5Padding to the authenticated AES/GCM/NoPadding, which is what actually removes the padding oracle for the deployments that never set th",
"evidence": "osv:CLSA-2026-1786543355",
"products": [
{
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"evidence": "/affected/0/package/name"
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{
"name": {
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/3/ranges"
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{
"name": {
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"evidence": "/affected/4/ranges"
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/5/package/name"
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"evidence": "/affected/5/ranges"
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"affected_versions": []
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{
"name": {
"value": "tomcat9-examples",
"evidence": "/affected/6/package/name"
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"prerequisites": [],
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"evidence": "/affected/6/ranges"
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"affected_versions": []
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{
"name": {
"value": "tomcat9-user",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "9.0.31-1ubuntu0.9+tuxcare.els7",
"evidence": "/affected/7/ranges"
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],
"affected_versions": []
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],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1786543355",
"aliases": [
"CLSA-2026-1786543355"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
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{
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}
]
}
],
"package": {
"name": "libtomcat9-embed-java",
"purl": "pkg:deb/tuxcare/libtomcat9-embed-java?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
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}
},
{
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"package": {
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"purl": "pkg:deb/tuxcare/libtomcat9-java?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
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}
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{
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],
"package": {
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"purl": "pkg:deb/tuxcare/tomcat9?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-2026-1786543355.json"
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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-2026-1786543355.json"
}
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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": {
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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": {
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}
},
{
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],
"package": {
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"purl": "pkg:deb/tuxcare/tomcat9-examples?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
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}
},
{
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},
{
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}
]
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],
"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-2026-1786543355.json"
}
}
],
"modified": "2026-10-26T09:31:40.146151561Z",
"provider": "osv",
"upstream": [
"CVE-2025-48989",
"CVE-2025-55752",
"CVE-2026-29146"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1786543355.html",
"https://nvd.nist.gov/vuln/detail/CVE-2024-24549",
"https://nvd.nist.gov/vuln/detail/CVE-2024-34750",
"https://nvd.nist.gov/vuln/detail/CVE-2024-50379",
"https://nvd.nist.gov/vuln/detail/CVE-2024-52316",
"https://nvd.nist.gov/vuln/detail/CVE-2025-48989",
"https://nvd.nist.gov/vuln/detail/CVE-2025-55752",
"https://nvd.nist.gov/vuln/detail/CVE-2026-29146"
]
},
"related_cves": [
{
"value": "CVE-2025-48989",
"evidence": "/upstream"
},
{
"value": "CVE-2025-55752",
"evidence": "/upstream"
},
{
"value": "CVE-2026-29146",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448023,
"published_at": "2026-08-20T10:41:55+00:00"
}