Nixpkgs security tracker

Login with GitHub

Details of issue NIXPKGS-2026-1681

NIXPKGS-2026-1681
published on
Permalink CVE-2026-42960
5.7 MEDIUM
  • CVSS version (CVSS): 4.0
  • Attack Vector (AV): Adjacent (A)
  • Attack Complexity (AC): Low (L)
  • 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): High (H)
  • Vulnerable System Impact Availability (VA): None (N)
  • Subsequent System Impact Confidentiality (SC): None (N)
  • Subsequent System Impact Integrity (SI): High (H)
  • Subsequent System Impact Availability (SA): High (H)
  • Exploit Maturity (E): POC (P)
  • Provider Urgency (U): Amber (Amber)
  • Modified Attack Vector (MAV): Adjacent (A)
  • Modified Attack Complexity (MAC): Low (L)
  • 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): High (H)
  • Modified Vulnerable System Impact Availability (MVA): None (N)
  • Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
  • Modified Subsequent System Impact Integrity (MSI): High (H)
  • Modified Subsequent System Impact Availability (MSA): High (H)
  • 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
Possible cache poisoning via promiscuous records for the authority section

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to poisoning via promiscuous records for the authority section. Promiscuous RRSets that complement DNS replies in the authority section can be used to trick Unbound to cache such records. If an adversary is able to attach such records in a reply (i.e., spoofed packet, fragmentation attack) he would be able to poison Unbound's cache. A malicious actor can exploit the possible poisonous effect by injecting RRSets other than NS that are also accompanied by address records in a reply, for example MX. This could be achieved by trying to spoof a reply packet or fragmentation attacks. Unbound would then accept the relative address records in the additional section and cache them if the authority RRSet has enough trust at this point, i.e., in-zone data for the delegation point. Unbound 1.25.1 contains a patch with a fix that disregards address records from the additional section if they are not explicitly relevant only to authority NS records, mitigating the possible poison effect. This is a complement fix to CVE-2025-11411.

Affected products

Unbound
  • <1.25.1

Matching in nixpkgs

Ignored packages (15)

Package maintainers

Ignored maintainers (1)