High
jetty, jetty12 and 1 more products — security advisory
A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary proxy to interpret different request boundaries, potentially resulting in HTTP request smuggling. This is caused by Jetty accepting a lone LF character as a terminator in parts of chunked request parsing. Depending on the Jetty version and configured HTTP compliance mode, this may occur in chunk extensions, chunk data termination, or trailer termination.
- Products
- jetty, jetty12, jetty9
- Affected versions
- 12.0.17-3.1, 12.0.32-1, 6.1.26-1ubuntu1, 6.1.26-1ubuntu1.1, 6.1.26-1ubuntu1.2, 6.1.26-5, 6.1.26-5ubuntu0.1, 9.2.14-1, 9.2.22-2, 9.2.22-3, 9.2.23-1, 9.4.15-1~18.04.1ubuntu1, 9.4.18-2build2, 9.4.26-1, 9.4.39-3, 9.4.44-2, 9.4.44-3, 9.4.44-4, 9.4.45-1, 9.4.51-2, 9.4.53-1, 9.4.57-1, 9.4.57-1.1, 9.4.58-1, 9.4.58-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-19203
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:55 UTC · Revision 1
Source evidence
A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary proxy to interpret different request boundaries, potentially resulting in HTTP request smuggling. This is caused by Jetty accepting a lone LF character as a terminator in parts of chunked request parsing. Depending on the Jetty version and configured HTTP compliance mode, this may occur in chunk extensions, chunk data termination, or trailer termination.
osv:UBUNTU-CVE-2026-19203
jetty
Fixed versions: Not specified
jetty
Fixed versions: Not specified
jetty9
Fixed versions: Not specified
jetty9
Fixed versions: Not specified
jetty9
Fixed versions: Not specified
jetty9
Fixed versions: Not specified
jetty9
Fixed versions: Not specified
jetty12
Fixed versions: Not specified
jetty9
Fixed versions: Not specified
jetty12
Fixed versions: Not specified
jetty9
Fixed versions: Not specified
Complete source record
{
"id": "9a6d7358285a079bd77664ca8ee9f5347f4b3fea6ffd687659e238507eba6e05",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-19203",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-19203",
"summary": "A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary proxy to interpret different request boundaries, potentially resulting in HTTP request smuggling. This is caused by Jetty accepting a lone LF character as a terminator in parts of chunked request parsing. Depending on the Jetty version and configured HTTP compliance mode, this may occur in chunk extensions, chunk data termination, or trailer termination.",
"evidence": "osv:UBUNTU-CVE-2026-19203",
"products": [
{
"name": {
"value": "jetty",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
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{
"value": "6.1.26-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "6.1.26-1ubuntu1.1",
"evidence": "/affected/0/versions"
},
{
"value": "6.1.26-1ubuntu1.2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
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{
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{
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{
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{
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"affected_versions": [
{
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},
{
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"evidence": "/affected/3/versions"
},
{
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},
{
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]
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{
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}
]
},
{
"name": {
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{
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"evidence": "/affected/5/versions"
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{
"value": "9.4.44-2",
"evidence": "/affected/5/versions"
},
{
"value": "9.4.44-3",
"evidence": "/affected/5/versions"
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{
"value": "9.4.44-4",
"evidence": "/affected/5/versions"
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{
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},
{
"name": {
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"evidence": "/affected/6/versions"
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}
]
},
{
"name": {
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"evidence": "/affected/7/package/name"
},
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"fixed_versions": [],
"affected_versions": [
{
"value": "12.0.32-1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "jetty9",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.4.58-1",
"evidence": "/affected/8/versions"
},
{
"value": "9.4.58-2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "jetty12",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "12.0.17-3.1",
"evidence": "/affected/9/versions"
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{
"value": "12.0.32-1",
"evidence": "/affected/9/versions"
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},
{
"name": {
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"affected_versions": [
{
"value": "9.4.57-1",
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},
{
"value": "9.4.57-1.1",
"evidence": "/affected/10/versions"
},
{
"value": "9.4.58-1",
"evidence": "/affected/10/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-19203",
"aliases": [
"UBUNTU-CVE-2026-19203"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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},
"versions": [
"6.1.26-1ubuntu1",
"6.1.26-1ubuntu1.1",
"6.1.26-1ubuntu1.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19203.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jetty",
"binary_version": "6.1.26-1ubuntu1.2"
},
{
"binary_name": "libjetty-extra",
"binary_version": "6.1.26-1ubuntu1.2"
},
{
"binary_name": "libjetty-extra-java",
"binary_version": "6.1.26-1ubuntu1.2"
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{
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},
"versions": [
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"6.1.26-5ubuntu0.1"
],
"database_specific": {
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},
"ecosystem_specific": {
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],
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},
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},
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},
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},
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],
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},
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],
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},
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},
{
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],
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"9.4.57-1.1",
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
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{
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{
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]
}
}
],
"modified": "2026-10-17T12:59:54.135349171Z",
"provider": "osv",
"upstream": [
"CVE-2026-19203"
],
"references": [
"https://ubuntu.com/security/CVE-2026-19203",
"https://www.cve.org/CVERecord?id=CVE-2026-19203"
]
},
"related_cves": [
{
"value": "CVE-2026-19203",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359908,
"published_at": "2026-09-08T13:17:00+00:00"
}