UnratedFix available
Fix CVE(s): CVE-2023-6516
Type: advisorySources: OSV
* SECURITY UPDATE: named running as a recursive resolver could be driven to exceed the configured max-cache-size, and exhaust available memory, because tree-pruning cleanup events were queued faster than they were processed - debian/patches/CVE-2023-6516.patch: limit isc_task_send() overhead for tree pruning (upstream c3377cbfaa) - debian/patches/CVE-2023-6516-lock-contention.patch: reduce lock contention during RBTDB tree pruning (upstream 801e888d03) - debian/patches/CVE-2023-6516-prune-guards.patch: guard re-queueing a node for pruning (upstream f6289ad931, 4b6fc97af6, 7d9be24bb1) - debian/patches/CVE-2023-6516-final-design.patch: the pruning design upstream settled on in 9.16.49, GL #4621 (upstream a548312191, eba7fb5f9f, 5f98eba608); adds dns_db_setprunetask() rather than changing the dns_db_settask() ABI - debian/libdns1104.symbols: record the three entry points the last patch adds - CVE-2023-6516
- Products
- bind9, bind9-doc, bind9-host, bind9utils, dnsutils, libbind-dev, libbind-export-dev, libbind9-161, libdns-export1104, libdns1104, libirs-export161, libirs161, libisc-export1100, libisc1100, libisccc-export161, libisccc161, libisccfg-export163, libisccfg163, liblwres161
- Affected versions
- Not specified
- Fixed versions
- 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
- CVEs
- CVE-2023-6516
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:22 UTC · Revision 1
Source evidence
* SECURITY UPDATE: named running as a recursive resolver could be driven to exceed the configured max-cache-size, and exhaust available memory, because tree-pruning cleanup events were queued faster than they were processed - debian/patches/CVE-2023-6516.patch: limit isc_task_send() overhead for tree pruning (upstream c3377cbfaa) - debian/patches/CVE-2023-6516-lock-contention.patch: reduce lock contention during RBTDB tree pruning (upstream 801e888d03) - debian/patches/CVE-2023-6516-prune-guards.patch: guard re-queueing a node for pruning (upstream f6289ad931, 4b6fc97af6, 7d9be24bb1) - debian/patches/CVE-2023-6516-final-design.patch: the pruning design upstream settled on in 9.16.49, GL #4621 (upstream a548312191, eba7fb5f9f, 5f98eba608); adds dns_db_setprunetask() rather than changing the dns_db_settask() ABI - debian/libdns1104.symbols: record the three entry points the last patch adds - CVE-2023-6516
osv:CLSA-2026-1787401059
bind9
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
bind9-doc
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
bind9-host
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
bind9utils
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
dnsutils
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libbind-dev
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libbind-export-dev
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libbind9-161
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libdns-export1104
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libdns1104
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libirs-export161
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libirs161
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libisc-export1100
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libisc1100
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libisccc-export161
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libisccc161
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libisccfg-export163
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
libisccfg163
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
liblwres161
Fixed versions: 1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5
Complete source record
{
"id": "a50b0bd3fcab48080345c3ee32045a9a7126031a64378d7c076b51203caef34e",
"url": "https://osv.dev/vulnerability/CLSA-2026-1787401059",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2023-6516",
"summary": "* SECURITY UPDATE: named running as a recursive resolver could be driven to exceed the configured max-cache-size, and exhaust available memory, because tree-pruning cleanup events were queued faster than they were processed - debian/patches/CVE-2023-6516.patch: limit isc_task_send() overhead for tree pruning (upstream c3377cbfaa) - debian/patches/CVE-2023-6516-lock-contention.patch: reduce lock contention during RBTDB tree pruning (upstream 801e888d03) - debian/patches/CVE-2023-6516-prune-guards.patch: guard re-queueing a node for pruning (upstream f6289ad931, 4b6fc97af6, 7d9be24bb1) - debian/patches/CVE-2023-6516-final-design.patch: the pruning design upstream settled on in 9.16.49, GL #4621 (upstream a548312191, eba7fb5f9f, 5f98eba608); adds dns_db_setprunetask() rather than changing the dns_db_settask() ABI - debian/libdns1104.symbols: record the three entry points the last patch adds - CVE-2023-6516",
"evidence": "osv:CLSA-2026-1787401059",
"products": [
{
"name": {
"value": "bind9",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "bind9-doc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "bind9-host",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "bind9utils",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dnsutils",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libbind-dev",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libbind-export-dev",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libbind9-161",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libdns-export1104",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libdns1104",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libirs-export161",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libirs161",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libisc-export1100",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libisc1100",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libisccc-export161",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libisccc161",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libisccfg-export163",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libisccfg163",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "liblwres161",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5",
"evidence": "/affected/18/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1787401059",
"aliases": [
"CLSA-2026-1787401059"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/tuxcare/bind9?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "bind9-doc",
"purl": "pkg:deb/tuxcare/bind9-doc?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "bind9-host",
"purl": "pkg:deb/tuxcare/bind9-host?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
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},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "bind9utils",
"purl": "pkg:deb/tuxcare/bind9utils?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "dnsutils",
"purl": "pkg:deb/tuxcare/dnsutils?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libbind-dev",
"purl": "pkg:deb/tuxcare/libbind-dev?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libbind-export-dev",
"purl": "pkg:deb/tuxcare/libbind-export-dev?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libbind9-161",
"purl": "pkg:deb/tuxcare/libbind9-161?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libdns-export1104",
"purl": "pkg:deb/tuxcare/libdns-export1104?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libdns1104",
"purl": "pkg:deb/tuxcare/libdns1104?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libirs-export161",
"purl": "pkg:deb/tuxcare/libirs-export161?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libirs161",
"purl": "pkg:deb/tuxcare/libirs161?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libisc-export1100",
"purl": "pkg:deb/tuxcare/libisc-export1100?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libisc1100",
"purl": "pkg:deb/tuxcare/libisc1100?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libisccc-export161",
"purl": "pkg:deb/tuxcare/libisccc-export161?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libisccc161",
"purl": "pkg:deb/tuxcare/libisccc161?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libisccfg-export163",
"purl": "pkg:deb/tuxcare/libisccfg-export163?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "libisccfg163",
"purl": "pkg:deb/tuxcare/libisccfg163?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.11.5.P4+dfsg-5.1+deb10u11+tuxcare.els5"
}
]
}
],
"package": {
"name": "liblwres161",
"purl": "pkg:deb/tuxcare/liblwres161?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787401059.json"
}
}
],
"modified": "2026-10-26T09:31:52.920460683Z",
"provider": "osv",
"upstream": [
"CVE-2023-6516"
],
"references": [
"https://errata.tuxcare.com/els_os/debian10els/CLSA-2026-1787401059.html",
"https://nvd.nist.gov/vuln/detail/CVE-2023-6516"
]
},
"related_cves": [
{
"value": "CVE-2023-6516",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448811,
"published_at": "2026-08-22T12:22:33+00:00"
}