High
trafficserver — security advisory
Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
- Products
- trafficserver
- Affected versions
- 5.3.0-2ubuntu1, 5.3.0-2ubuntu2, 7.0.0-5, 7.1.2+ds-2, 7.1.2+ds-2build1, 7.1.2+ds-3, 8.0.5+ds-1, 8.0.5+ds-2, 8.0.5+ds-2build1, 8.0.5+ds-2ubuntu1, 8.0.5+ds-3, 8.0.5+ds-3ubuntu0.1~esm1, 8.1.1+ds-1.1, 9.1.1+ds-2build1, 9.1.1+ds-2ubuntu0.1, 9.1.1+ds-2ubuntu0.1+esm1, 9.1.1+ds-2ubuntu0.1~esm1, 9.2.1+ds-1build1, 9.2.2+ds-1, 9.2.3+ds-1, 9.2.3+ds-1+deb12u1, 9.2.3+ds-1+deb12u1build1, 9.2.3+ds-1+deb12u1build3, 9.2.3+ds-1+deb12u1build4, 9.2.3+ds-1+deb12u1ubuntu0.1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33930
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 09:08 UTC · Revision 1
Source evidence
Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
osv:UBUNTU-CVE-2026-33930
trafficserver
Fixed versions: Not specified
trafficserver
Fixed versions: Not specified
trafficserver
Fixed versions: Not specified
trafficserver
Fixed versions: Not specified
trafficserver
Fixed versions: Not specified
Complete source record
{
"id": "0c62239dd7b6f3819b4fb2766dd29797e3924b5f02421bc18cb98eedef53d162",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-33930",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-33930",
"summary": "Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.",
"evidence": "osv:UBUNTU-CVE-2026-33930",
"products": [
{
"name": {
"value": "trafficserver",
"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "5.3.0-2ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "5.3.0-2ubuntu2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"value": "7.0.0-5",
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{
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"evidence": "/affected/1/versions"
},
{
"value": "7.1.2+ds-2build1",
"evidence": "/affected/1/versions"
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{
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{
"name": {
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"evidence": "/affected/2/package/name"
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"affected_versions": [
{
"value": "8.0.5+ds-1",
"evidence": "/affected/2/versions"
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{
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{
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"evidence": "/affected/2/versions"
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{
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},
{
"value": "8.0.5+ds-3",
"evidence": "/affected/2/versions"
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{
"value": "8.0.5+ds-3ubuntu0.1~esm1",
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{
"name": {
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{
"value": "8.1.1+ds-1.1",
"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
},
{
"value": "9.1.1+ds-2ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "9.1.1+ds-2ubuntu0.1",
"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
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},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
"value": "9.2.1+ds-1build1",
"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
},
{
"value": "9.2.3+ds-1",
"evidence": "/affected/4/versions"
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{
"value": "9.2.3+ds-1+deb12u1",
"evidence": "/affected/4/versions"
},
{
"value": "9.2.3+ds-1+deb12u1build1",
"evidence": "/affected/4/versions"
},
{
"value": "9.2.3+ds-1+deb12u1build3",
"evidence": "/affected/4/versions"
},
{
"value": "9.2.3+ds-1+deb12u1build4",
"evidence": "/affected/4/versions"
},
{
"value": "9.2.3+ds-1+deb12u1ubuntu0.1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-33930",
"aliases": [
"UBUNTU-CVE-2026-33930"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "trafficserver",
"purl": "pkg:deb/ubuntu/trafficserver?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"5.3.0-2ubuntu1",
"5.3.0-2ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33930.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "trafficserver",
"binary_version": "5.3.0-2ubuntu2"
},
{
"binary_name": "trafficserver-experimental-plugins",
"binary_version": "5.3.0-2ubuntu2"
}
]
}
},
{
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"type": "ECOSYSTEM",
"events": [
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}
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}
],
"package": {
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"purl": "pkg:deb/ubuntu/trafficserver?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"7.0.0-5",
"7.1.2+ds-2",
"7.1.2+ds-2build1",
"7.1.2+ds-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33930.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
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{
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"package": {
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"purl": "pkg:deb/ubuntu/trafficserver?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
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"8.0.5+ds-2",
"8.0.5+ds-2build1",
"8.0.5+ds-2ubuntu1",
"8.0.5+ds-3",
"8.0.5+ds-3ubuntu0.1~esm1"
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"database_specific": {
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},
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},
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"database_specific": {
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"ecosystem_specific": {
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{
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"package": {
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
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"9.2.3+ds-1",
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"9.2.3+ds-1+deb12u1build1",
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"9.2.3+ds-1+deb12u1build4",
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"ecosystem_specific": {
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{
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}
],
"modified": "2026-10-08T12:53:38.905676963Z",
"provider": "osv",
"upstream": [
"CVE-2026-33930"
],
"references": [
"https://ubuntu.com/security/CVE-2026-33930",
"https://www.cve.org/CVERecord?id=CVE-2026-33930",
"https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d"
]
},
"related_cves": [
{
"value": "CVE-2026-33930",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 99574,
"published_at": "2026-07-29T08:16:00+00:00"
}