VulnSocial

CVE-2026-42955General(nlnetlabs / unbound)

LOWCVSS 3.7 · LOW

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Patch nlnetlabs unbound systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. Similar to other 'ghost domain names' attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client A/AAAA query can cause Unbound to overwrite the cached expired parent-side glue rrset and essentially extend the ghost domain window by up to one cached TTL configured value ('cache-max-ttl'). In configurations where 'harden-referral-path: yes' is used (non-default configuration), no client query is required since Unbound implicitly performs that query. This is a variant of CVE-2026-40622 which only addressed the NS query.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-672

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

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

  • unbound

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • General: 1 classified signal
  • 2 total mentions across 1 day

Affected systems

Vendors
nlnetlabs
Products
unbound

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-07-22: 2Patch / Workaround · 2026-07-22: 1Technical Details · 2026-07-22: 207-22
Signal classification2 categories
General
150.0%
Patch
150.0%
Full discourse2 posts
  • Yasuhiro Morishita@OrangeMorishita
    General

    CVE-2026-14586 Medium DoS CVE-2026-32665 High DoS CVE-2026-40691 High DoS CVE-2026-41637 Low DoS CVE-2026-42955 Low CVE-2026-40622（幽霊ドメイン名）の追加修正 CVE-2026-44621 Medium DoS CVE-2026-44687 Low DoS（存在するドメイン名を存在しないと誤認させる） CVE-2026-44690 High キャッシュポイズニング CVE-2026-46582 Low キャッシュポイズニング CVE-2026-50045 Medium 外部へのDoS CVE-2026-50046 Medium DoS CVE-2026-50243 Medium DNSSEC検証のバイパス CVE-2026-50248 Medium DNSSEC Bogusでもゾーン転送の接続先にしてしまう CVE-2026-50251 Medium 外部からの意図的なキャッシュクリアによるDoS CVE-2026-50252 Medium UDPソースポートを外部から推測可能（キャッシュポイズニング） CVE-2026-52863 Medium DoS CVE-2026-54478 Low DNSクッキーの無力化 CVE-2026-55708 Low ローカルな名前を外部に問い合わせてしまう（情報流出） CVE-2026-55717 Medium DoS CVE-2026-55973 High DoS CVE-2026-55990 Medium DoS CVE-2026-55991 Medium DoS CVE-2026-56416 Medium DoS CVE-2026-56444 Medium DoS

    Post summary

    The text lists CVE-2026 identifiers with severity levels and brief vulnerability categories, providing technical details but lacking any PoC, exploit, active usage, or remediation information.

    10040503
    4.6K followersView on X
  • strnh@strnh
    Patch

    unbound-1.25.2 来た。 - CVE-2026-42955,CVE-2026-40622: "glue-record を介した 幽霊ドメインの一時的な委任更新" の是正👷 .. 他にも結構あるので、これは上げなければならぬ。

    Post summary

    The post announces the release of unbound‑1.25.2, noting that it contains patches for CVE‑2026‑42955 and CVE‑2026‑40622, with brief technical details on the vulnerability.

    02010166
    1.9K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appnlnetlabsunbound---

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