CVE-2026-12245Disclosure(nlnetlabs / nsd)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch nlnetlabs nsd systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

nlnetlabs CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Patch / fix

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12245.txt

Weakness type (CWE)

CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

Threat summary

Patch or workaround signal is available
5 mentions across 4 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 3 signals
Disclosure: 4 classified signals
Peaked 3d ago at 2 mentions (2026-06-25); latest day: 1
5 total mentions across 4 days

Affected systems

Vendors

nlnetlabs

Products

nsd

Deep dive

Activity timeline5 mentions / 4d

Signal classification2 categories

Disclosure

480.0%

Patch

120.0%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-06-25	2	Disclosure2
2026-06-26	1	Patch1
2026-06-29	1	Disclosure1
2026-07-06	1	Disclosure1

Full discourse5 posts

日本レジストリサービス（JPRS）@JPRS_official87d
Disclosure
【注意喚起】NSDの脆弱性情報が公開されました（CVE-2026-12244、CVE-2026-12245、CVE-2026-12246、CVE-2026-12490） https://jprs.jp/tech/security/2026-06-29-nsd.html
Post summary
A notice announces the release of new vulnerability information for four CVEs, but provides no further details about exploits, patches, or technical specifics.
031601.4K
1.3K followersView on X
Yasuhiro Morishita@OrangeMorishita91d
Disclosure
CVE-2026-12244：特別に細工されたSVCBレコードでセカンダリサーバーのnsdをヒープオーバーフロー可能。最悪の場合RCE。 CVE-2026-12245：DoTの実装不具合でuse-after-free、外部からDoS攻撃可能。（続く）
Post summary
The post discloses two CVEs affecting nsd resolution: CVE‑2026‑12244 causes a heap overflow that could lead to RCE via a crafted SVCB record, while CVE‑2026‑12245 involves a use‑after‑free in DoT implementation that may be exploited for DoS.
12041224
4.5K followersView on X
Open Source Security mailing list@oss_security90d
Patch
NLnet Labs NSD: 4 "high" CVEs fixed in 4.14.3 https://www.openwall.com/lists/oss-security/2026/06/25/9 CVE-2026-12244: Heap overflow with crafted SVCB RR CVE-2026-12245: Denial of DNS over TLS service CVE-2026-12246: Out of bounds stack write with crafted APL RR CVE-2026-12490: Bypass of client certificate
Post summary
NLnet Labs announced that four high‑severity CVEs affecting NSD have been patched in version 4.14.3, detailing the types of vulnerabilities (heap overflow, DNS‑over‑TLS denial, stack write, and certificate bypass).
01050777
4.7K followersView on X
日本レジストリサービス（JPRS）@JPRS_official80d
Disclosure
【メールマガジン（FROM JPRS）】最新号を掲載しました。通常号 vol.1252「NSDの脆弱性情報が公開されました（CVE-2026-12244、CVE-2026-12245、CVE-2026-12246、CVE-2026-12490）、他2件」など https://jprs.jp/mail/backnumber/2026/260706.html
Post summary
The newsletter announces the publication of vulnerability information for several CVEs, indicating a disclosure-focused communication.
00031367
1.3K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds91d
Disclosure
CVE-2026-12245 Heap Use-After-Free in NSD 4.13.0 DoT Logging Causes Server Crash https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-12245
Post summary
This brief notice announces a heap use‑after‑free vulnerability in NSD 4.13.0 that leads to a server crash, with no evidence of exploitation, PoC, or patch details provided.
00010128
4.1K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	nlnetlabs	nsd	-	-	-

Explore more

Back to dashboard nlnetlabs CVEs nsd vulnerabilities

What researchers are saying

CVE-2026-12245

Yasuhiro Morishita[verified]@OrangeMorishitaDisclosure

The post discloses two CVEs affecting nsd resolution: CVE‑2026‑12244 causes a heap overflow that could lead to RCE via a crafted SVCB record, while CVE‑2026‑12245 involves a use‑after‑free in DoT implementation that may be exploited for DoS.

日本レジストリサービス（JPRS）@JPRS_officialDisclosure

A notice announces the release of new vulnerability information for four CVEs, but provides no further details about exploits, patches, or technical specifics.

Open Source Security mailing list@oss_securityPatch

NLnet Labs announced that four high‑severity CVEs affecting NSD have been patched in version 4.14.3, detailing the types of vulnerabilities (heap overflow, DNS‑over‑TLS denial, stack write, and certificate bypass).

日本レジストリサービス（JPRS）@JPRS_officialDisclosure

The newsletter announces the publication of vulnerability information for several CVEs, indicating a disclosure-focused communication.

Vulmon Vulnerability Feed@VulmonFeedsDisclosure

This brief notice announces a heap use‑after‑free vulnerability in NSD 4.13.0 that leads to a server crash, with no evidence of exploitation, PoC, or patch details provided.