HighFix available
dnsdist, h2o and 2 more products — security advisory
A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released.
- Products
- dnsdist, h2o, lighttpd, varnish
- Affected versions
- 1.4.31-3ubuntu3, 1.4.33-1+nmu2ubuntu1, 1.4.33-1+nmu2ubuntu2, 1.4.33-1+nmu2ubuntu2.1, 1.4.33-1+nmu2ubuntu2.1+esm1, 1.4.33-1ubuntu1, 1.4.35-4ubuntu1, 1.4.35-4ubuntu2, 1.4.35-4ubuntu2.1, 1.4.35-4ubuntu2.1+esm1, 1.4.45-1ubuntu1, 1.4.45-1ubuntu3, 1.4.45-1ubuntu3+esm1, 1.4.45-1ubuntu3.18.04, 1.4.45-1ubuntu3.18.04+esm1, 1.4.45-1ubuntu3.18.04.1, 1.4.45-1ubuntu3.18.04.1+esm1, 1.4.53-4ubuntu2, 1.4.54-2ubuntu1, 1.4.55-1ubuntu1, 1.4.55-1ubuntu1.20.04.1, 1.4.55-1ubuntu1.20.04.2, 1.4.59-1ubuntu2, 1.4.59-1ubuntu3, 1.4.63-1ubuntu1, 1.4.63-1ubuntu2, 1.4.63-1ubuntu3, 1.4.63-1ubuntu3.1, 1.4.69-1ubuntu1, 1.4.69-1ubuntu2, 1.4.73-1ubuntu1, 1.4.73-1ubuntu2, 1.4.74-1ubuntu2, 1.4.74-1ubuntu3, 1.4.79-1ubuntu1, 1.4.79-2ubuntu1, 1.4.82-2ubuntu1, 1.4.82-2ubuntu2, 1.4.84-1ubuntu3, 1.4.85-1ubuntu2, 1.8.0-1, 1.8.2-1, 1.8.2-2, 1.8.2-3, 1.8.3-1, 1.8.3-2, 1.8.3-2build1, 1.8.3-2build2, 1.9.10-1, 1.9.8-1, 2.2.3+dfsg-2, 2.2.4+dfsg-1, 2.2.4+dfsg-1build1, 2.2.4+dfsg-1ubuntu0.1~esm2, 2.2.5+dfsg2-3, 2.2.5+dfsg2-3build1, 2.2.5+dfsg2-3ubuntu0.1~esm1, 2.2.5+dfsg2-6, 2.2.5+dfsg2-6.1, 2.2.5+dfsg2-6.1ubuntu1, 2.2.5+dfsg2-6.1ubuntu2, 2.2.5+dfsg2-6.1ubuntu2+esm1, 2.2.5+dfsg2-7, 2.2.5+dfsg2-8, 2.2.5+dfsg2-8.1ubuntu1, 2.2.5+dfsg2-8.1ubuntu2, 2.2.5+dfsg2-8.1ubuntu3, 3.0.4-1ubuntu1, 3.0.4-1ubuntu2, 3.0.5-1ubuntu2, 3.0.5-2, 3.0.5-2ubuntu0.1, 4.0.3-1, 4.1.0-1, 4.1.0-2, 4.1.1-1, 4.1.1-1ubuntu0.2, 4.1.1-1ubuntu0.2+esm1, 5.0.0-7.1, 5.2.1-1, 5.2.1-1ubuntu0.1, 5.2.1-1ubuntu0.1+esm1, 6.1.1-1, 6.2.1-2, 6.2.1-2ubuntu0.1, 6.2.1-2ubuntu0.1~esm1, 6.2.1-2ubuntu0.1~esm2, 6.2.1-2ubuntu0.2, 6.2.1-2ubuntu0.2+esm1, 6.5.2-1, 6.6.1-1, 6.6.1-1ubuntu0.2, 6.6.1-1ubuntu0.2+esm1, 7.1.1-1.1ubuntu1, 7.7.0-1, 7.7.0-2, 7.7.0-3, 7.7.3-1
- Fixed versions
- 1.8.3-2ubuntu0.1~esm1, 1.9.10-1ubuntu0.1
- CVEs
- CVE-2025-8671
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:56 UTC · Revision 1
Source evidence
A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released.
osv:UBUNTU-CVE-2025-8671
lighttpd
Fixed versions: Not specified
varnish
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
varnish
Fixed versions: Not specified
h2o
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
varnish
Fixed versions: Not specified
h2o
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
varnish
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
h2o
Fixed versions: Not specified
varnish
Fixed versions: Not specified
h2o
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
varnish
Fixed versions: Not specified
dnsdist
Fixed versions: 1.8.3-2ubuntu0.1~esm1
dnsdist
Fixed versions: 1.9.10-1ubuntu0.1
lighttpd
Fixed versions: Not specified
varnish
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
lighttpd
Fixed versions: Not specified
Complete source record
{
"id": "d4a7df7ab5af62711b6d983a0ad128bcbadcfb07d95f93ccb42a4f8a88787729",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-8671",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-8671",
"summary": "A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released.",
"evidence": "osv:UBUNTU-CVE-2025-8671",
"products": [
{
"name": {
"value": "lighttpd",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.31-3ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.33-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.33-1+nmu2ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.33-1+nmu2ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.33-1+nmu2ubuntu2.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.33-1+nmu2ubuntu2.1+esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.4-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "3.0.4-1ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "3.0.5-1ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "3.0.5-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.0.5-2ubuntu0.1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.35-4ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.35-4ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.35-4ubuntu2.1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.35-4ubuntu2.1+esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0.3-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.1.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.1.0-2",
"evidence": "/affected/3/versions"
},
{
"value": "4.1.1-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.1.1-1ubuntu0.2",
"evidence": "/affected/3/versions"
},
{
"value": "4.1.1-1ubuntu0.2+esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "h2o",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.3+dfsg-2",
"evidence": "/affected/4/versions"
},
{
"value": "2.2.4+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.2.4+dfsg-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "2.2.4+dfsg-1ubuntu0.1~esm2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.45-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1.4.45-1ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "1.4.45-1ubuntu3+esm1",
"evidence": "/affected/5/versions"
},
{
"value": "1.4.45-1ubuntu3.18.04",
"evidence": "/affected/5/versions"
},
{
"value": "1.4.45-1ubuntu3.18.04+esm1",
"evidence": "/affected/5/versions"
},
{
"value": "1.4.45-1ubuntu3.18.04.1",
"evidence": "/affected/5/versions"
},
{
"value": "1.4.45-1ubuntu3.18.04.1+esm1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.0.0-7.1",
"evidence": "/affected/6/versions"
},
{
"value": "5.2.1-1",
"evidence": "/affected/6/versions"
},
{
"value": "5.2.1-1ubuntu0.1",
"evidence": "/affected/6/versions"
},
{
"value": "5.2.1-1ubuntu0.1+esm1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "h2o",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.5+dfsg2-3",
"evidence": "/affected/7/versions"
},
{
"value": "2.2.5+dfsg2-3build1",
"evidence": "/affected/7/versions"
},
{
"value": "2.2.5+dfsg2-3ubuntu0.1~esm1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.53-4ubuntu2",
"evidence": "/affected/8/versions"
},
{
"value": "1.4.54-2ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "1.4.55-1ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "1.4.55-1ubuntu1.20.04.1",
"evidence": "/affected/8/versions"
},
{
"value": "1.4.55-1ubuntu1.20.04.2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.1.1-1",
"evidence": "/affected/9/versions"
},
{
"value": "6.2.1-2",
"evidence": "/affected/9/versions"
},
{
"value": "6.2.1-2ubuntu0.1~esm1",
"evidence": "/affected/9/versions"
},
{
"value": "6.2.1-2ubuntu0.1~esm2",
"evidence": "/affected/9/versions"
},
{
"value": "6.2.1-2ubuntu0.1",
"evidence": "/affected/9/versions"
},
{
"value": "6.2.1-2ubuntu0.2",
"evidence": "/affected/9/versions"
},
{
"value": "6.2.1-2ubuntu0.2+esm1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.59-1ubuntu2",
"evidence": "/affected/10/versions"
},
{
"value": "1.4.59-1ubuntu3",
"evidence": "/affected/10/versions"
},
{
"value": "1.4.63-1ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "1.4.63-1ubuntu2",
"evidence": "/affected/10/versions"
},
{
"value": "1.4.63-1ubuntu3",
"evidence": "/affected/10/versions"
},
{
"value": "1.4.63-1ubuntu3.1",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "h2o",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.5+dfsg2-6",
"evidence": "/affected/11/versions"
},
{
"value": "2.2.5+dfsg2-6.1",
"evidence": "/affected/11/versions"
},
{
"value": "2.2.5+dfsg2-6.1ubuntu1",
"evidence": "/affected/11/versions"
},
{
"value": "2.2.5+dfsg2-6.1ubuntu2",
"evidence": "/affected/11/versions"
},
{
"value": "2.2.5+dfsg2-6.1ubuntu2+esm1",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.5.2-1",
"evidence": "/affected/12/versions"
},
{
"value": "6.6.1-1",
"evidence": "/affected/12/versions"
},
{
"value": "6.6.1-1ubuntu0.2",
"evidence": "/affected/12/versions"
},
{
"value": "6.6.1-1ubuntu0.2+esm1",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "h2o",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.5+dfsg2-7",
"evidence": "/affected/13/versions"
},
{
"value": "2.2.5+dfsg2-8",
"evidence": "/affected/13/versions"
},
{
"value": "2.2.5+dfsg2-8.1ubuntu1",
"evidence": "/affected/13/versions"
},
{
"value": "2.2.5+dfsg2-8.1ubuntu2",
"evidence": "/affected/13/versions"
},
{
"value": "2.2.5+dfsg2-8.1ubuntu3",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.69-1ubuntu1",
"evidence": "/affected/14/versions"
},
{
"value": "1.4.69-1ubuntu2",
"evidence": "/affected/14/versions"
},
{
"value": "1.4.73-1ubuntu1",
"evidence": "/affected/14/versions"
},
{
"value": "1.4.73-1ubuntu2",
"evidence": "/affected/14/versions"
},
{
"value": "1.4.74-1ubuntu2",
"evidence": "/affected/14/versions"
},
{
"value": "1.4.74-1ubuntu3",
"evidence": "/affected/14/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.1.1-1.1ubuntu1",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.8.3-2ubuntu0.1~esm1",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": [
{
"value": "1.8.0-1",
"evidence": "/affected/16/versions"
},
{
"value": "1.8.2-1",
"evidence": "/affected/16/versions"
},
{
"value": "1.8.2-2",
"evidence": "/affected/16/versions"
},
{
"value": "1.8.2-3",
"evidence": "/affected/16/versions"
},
{
"value": "1.8.3-1",
"evidence": "/affected/16/versions"
},
{
"value": "1.8.3-2",
"evidence": "/affected/16/versions"
},
{
"value": "1.8.3-2build1",
"evidence": "/affected/16/versions"
},
{
"value": "1.8.3-2build2",
"evidence": "/affected/16/versions"
}
]
},
{
"name": {
"value": "dnsdist",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.10-1ubuntu0.1",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": [
{
"value": "1.9.8-1",
"evidence": "/affected/17/versions"
},
{
"value": "1.9.10-1",
"evidence": "/affected/17/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.79-1ubuntu1",
"evidence": "/affected/18/versions"
},
{
"value": "1.4.79-2ubuntu1",
"evidence": "/affected/18/versions"
},
{
"value": "1.4.82-2ubuntu1",
"evidence": "/affected/18/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/19/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.7.0-1",
"evidence": "/affected/19/versions"
},
{
"value": "7.7.0-2",
"evidence": "/affected/19/versions"
},
{
"value": "7.7.0-3",
"evidence": "/affected/19/versions"
},
{
"value": "7.7.3-1",
"evidence": "/affected/19/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/20/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.82-2ubuntu2",
"evidence": "/affected/20/versions"
},
{
"value": "1.4.84-1ubuntu3",
"evidence": "/affected/20/versions"
},
{
"value": "1.4.85-1ubuntu2",
"evidence": "/affected/20/versions"
}
]
},
{
"name": {
"value": "lighttpd",
"evidence": "/affected/21/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.82-2ubuntu1",
"evidence": "/affected/21/versions"
},
{
"value": "1.4.82-2ubuntu2",
"evidence": "/affected/21/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2025-8671",
"aliases": [
"UBUNTU-CVE-2025-8671"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lighttpd",
"purl": "pkg:deb/ubuntu/lighttpd?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"1.4.31-3ubuntu3",
"1.4.33-1ubuntu1",
"1.4.33-1+nmu2ubuntu1",
"1.4.33-1+nmu2ubuntu2",
"1.4.33-1+nmu2ubuntu2.1",
"1.4.33-1+nmu2ubuntu2.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8671.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "lighttpd",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-cml",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-magnet",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-mysql-vhost",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-trigger-b4-dl",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
},
{
"binary_name": "lighttpd-mod-webdav",
"binary_version": "1.4.33-1+nmu2ubuntu2.1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "varnish",
"purl": "pkg:deb/ubuntu/varnish?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
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],
"modified": "2026-10-17T12:57:46.218490745Z",
"provider": "osv",
"upstream": [
"CVE-2025-8671"
],
"references": [
"https://ubuntu.com/security/CVE-2025-8671",
"https://www.cve.org/CVERecord?id=CVE-2025-8671",
"https://kb.cert.org/vuls/id/767506",
"https://galbarnahum.com/made-you-reset",
"https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80",
"https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq",
"https://gitlab.isc.org/isc-projects/bind9/-/issues/5325",
"https://support2.windriver.com/index.php?page=security-notices",
"https://varnish-cache.org/security/VSV00017.html",
"https://www.fastlystatus.com/incident/377810",
"https://www.suse.com/support/kb/doc/?id=000021980",
"https://www.openwall.com/lists/oss-security/2025/09/18/1",
"https://ubuntu.com/security/notices/USN-8037-1"
]
},
"related_cves": [
{
"value": "CVE-2025-8671",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 357677,
"published_at": "2025-08-13T13:15:00+00:00"
}