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9 vulnerabilities found for NSD by NLnet Labs
CVE-2026-19538 (GCVE-0-2026-19538)
Vulnerability from cvelistv5
Published
2026-08-26 08:47
Modified
2026-08-26 14:00
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 4.8.0 ≤ |
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CVE-2026-19401 (GCVE-0-2026-19401)
Vulnerability from cvelistv5
Published
2026-08-26 08:44
Modified
2026-08-26 14:16
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512). By continuously crashing the serve childs, the remote client can severely hamper or, when positioned sufficiently close, deny all DNS service.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 4.3.7 ≤ |
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CVE-2026-18916 (GCVE-0-2026-18916)
Vulnerability from cvelistv5
Published
2026-08-26 08:39
Modified
2026-08-26 14:22
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-191 - Integer Underflow
Summary
Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 3.2.11 ≤ |
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CVE-2026-18664 (GCVE-0-2026-18664)
Vulnerability from cvelistv5
Published
2026-08-26 08:34
Modified
2026-08-26 14:47
Severity ?
VLAI Severity ?
EPSS score ?
Summary
When ranges are used for access control (i.e. of the form 1.2.3.4-1.2.3.25), because NSD wrongly compares the IP address with the range on little endian systems, IPs that were meant to be allowed may be denied, and, IPs that were meant to be denied access could be allowed. An IPv4 address is compared with IPv4 ranges as unsigned 32 bit numbers directly with the endianness of the host, but the values to compare are in network byte order (big-endian). With IPv6 addresses the comparison is done in 4 times a unsigned 32 bit number comparison, again with the endianness of the host where all values are actually in network bye order.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 3.0.0 ≤ |
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CVE-2026-12490 (GCVE-0-2026-12490)
Vulnerability from cvelistv5
Published
2026-06-25 05:24
Modified
2026-06-25 12:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 4.10.1 ≤ |
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CVE-2026-12246 (GCVE-0-2026-12246)
Vulnerability from cvelistv5
Published
2026-06-25 05:24
Modified
2026-06-25 12:42
Severity ?
VLAI Severity ?
EPSS score ?
Summary
NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 4.14.0 ≤ |
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CVE-2026-12245 (GCVE-0-2026-12245)
Vulnerability from cvelistv5
Published
2026-06-25 05:24
Modified
2026-06-25 12:42
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 4.13.0 ≤ |
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CVE-2026-12244 (GCVE-0-2026-12244)
Vulnerability from cvelistv5
Published
2026-06-25 05:24
Modified
2026-06-25 12:45
Severity ?
VLAI Severity ?
EPSS score ?
Summary
If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| NLnet Labs | NSD |
Version: 4.14.0 ≤ |
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CVE-2020-28935 (GCVE-0-2020-28935)
Vulnerability from cvelistv5
Published
2020-12-07 21:46
Modified
2024-09-16 23:27
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Summary
NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case the file was already present, they would follow symlinks if the file happened to be a symlink instead of a regular file. An additional chown of the file would then take place after it was written, making the user Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker having access to the limited permission user Unbound/NSD runs as and point through the symlink to a critical file on the system.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| NLnet Labs | Unbound |
Version: <= 1.12.0 |
|||||||
|
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"url": "https://security.gentoo.org/glsa/202101-38"
},
{
"name": "[debian-lts-announce] 20210212 [SECURITY] [DLA 2556-1] unbound1.9 security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00017.html"
},
{
"name": "[debian-lts-announce] 20230329 [SECURITY] [DLA 3371-1] unbound security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html"
}
],
"title": "Local symlink attack in Unbound and NSD"
}
},
"cveMetadata": {
"assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
"assignerShortName": "NLnet Labs",
"cveId": "CVE-2020-28935",
"datePublished": "2020-12-07T21:46:47.878Z",
"dateReserved": "2020-11-18T00:00:00.000Z",
"dateUpdated": "2024-09-16T23:27:01.127Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}