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Details of issue NIXPKGS-2026-1680

NIXPKGS-2026-1680
published on
Permalink CVE-2026-42959
8.7 HIGH
  • CVSS version (CVSS): 4.0
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Attack Requirement (AT): None (N)
  • 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)
  • Provider Urgency (U): Red (Red)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Attack Requirement (MAT): None (N)
  • 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)
  • Exploit Maturity (E): 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
Crash during DNSSEC validation of malicious content

NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.

Affected products

Unbound
  • <1.25.1

Matching in nixpkgs

Ignored packages (15)

Package maintainers

Ignored maintainers (1)