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Details of issue NIXPKGS-2026-1686

NIXPKGS-2026-1686
published on
Permalink CVE-2026-44608
4.6 MEDIUM
  • CVSS version (CVSS): 4.0
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): High (H)
  • Attack Requirement (AT): Present (P)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Vulnerable System Impact Confidentiality (VC): None (N)
  • Vulnerable System Impact Integrity (VI): None (N)
  • Vulnerable System Impact Availability (VA): High (H)
  • Subsequent System Impact Confidentiality (SC): None (N)
  • Subsequent System Impact Integrity (SI): None (N)
  • Subsequent System Impact Availability (SA): None (N)
  • Exploit Maturity (E): Unreported (U)
  • Provider Urgency (U): Amber (Amber)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): High (H)
  • Modified Attack Requirement (MAT): Present (P)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Vulnerable System Impact Confidentiality (MVC): None (N)
  • Modified Vulnerable System Impact Integrity (MVI): None (N)
  • Modified Vulnerable System Impact Availability (MVA): High (H)
  • Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
  • Modified Subsequent System Impact Integrity (MSI): Negligible (N)
  • Modified Subsequent System Impact Availability (MSA): Negligible (N)
  • Safety (S): Not Defined (X)
  • Automatable (AU): Not Defined (X)
  • Recovery (R): Not Defined (X)
  • Value Density (V): Not Defined (X)
  • Vulnerability Response Effort (RE): Not Defined (X)
  • Confidentiality Req. (CR): Not Defined (X)
  • Integrity Req. (IR): Not Defined (X)
  • Availability Req. (AR): Not Defined (X)
updated 2 days, 12 hours ago by @LeSuisse Activity log
  • Created suggestion 2 days, 17 hours ago
  • @LeSuisse ignored
    15 packages
    • luaPackages.luaunbound
    • lua51Packages.luaunbound
    • lua52Packages.luaunbound
    • lua53Packages.luaunbound
    • lua54Packages.luaunbound
    • lua55Packages.luaunbound
    • luajitPackages.luaunbound
    • prometheus-unbound-exporter
    • python312Packages.pyunbound
    • python313Packages.pyunbound
    • python314Packages.pyunbound
    • haskellPackages.unbound-generics
    • haskellPackages.unbounded-delays
    • haskellPackages.unbound-kind-generics
    • haskellPackages.unbound-generics-unify
    2 days, 12 hours ago
  • @LeSuisse ignored maintainer @Scrumplex 2 days, 12 hours ago maintainer.ignore
  • @LeSuisse accepted 2 days, 12 hours ago
  • @LeSuisse published on GitHub 2 days, 12 hours ago
Use after free and crash under special conditions in RPZ code

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers) it could result in heap use-after-free and eventual crash. An adversary can exploit the vulnerability if conditions are first met on a vulnerable Unbound, i.e., multi-threaded, an RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers and an ongoing XFR for that RPZ zone. Local RPZ files do not trigger the vulnerability. If the timing is right and an XFR happens at the same time another thread needs to read that RPZ zone, the reader may not hold the lock long enough and the thread applying the XFR may free objects that the reader is about to walk causing the use-after-free. Unbound 1.25.1 contains a patch with a fix to the locking code.

Affected products

Unbound
  • <1.25.1

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Ignored packages (15)

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Ignored maintainers (1)