p PatchFirst

CVE-2026-64193

CVE-2026-64193 · Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR. Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose parses the EXTRA-TEXT field of an EDNS EXTENDED-ERROR option (RFC 8914) by tokenising the raw bytes and passing the result to Perl's eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt->edns->option('EXTENDED-ERROR') is called in array context, for example with a payload of {0:`"<command>"`} in EXTRA-TEXT.

CVSS 9.8 · Critical · EPSS 1.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • net::dns

    Versions
    • ≥ 0, ≤ 1.55: Affected (custom)

    No fix published

  • libnet-dns-perl Debian:13

    Versions
    • 1.50-1
    • 1.53-1
    • 1.54-1
    • 1.55-1
    Affected ranges
    • ECOSYSTEM: < 1.56-0+deb13u1

    Update to 1.56-0+deb13u1

  • libnet-dns-perl Debian:14

    Versions
    • 1.50-1
    • 1.53-1
    • 1.54-1
    • 1.55-1
    Affected ranges
    • ECOSYSTEM: < 1.56-1

    Update to 1.56-1

  • libnet-dns-perl Ubuntu:14.04:LTS

    Versions
    • 0.68-1.2
    • 0.68-1.2build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libnet-dns-perl Ubuntu:16.04:LTS

    Versions
    • 0.81-2
    • 0.81-2build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libnet-dns-perl Ubuntu:18.04:LTS

    Versions
    • 1.10-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libnet-dns-perl Ubuntu:20.04:LTS

    Versions
    • 1.20-1
    • 1.21-1
    • 1.22-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libnet-dns-perl Ubuntu:22.04:LTS

    Versions
    • 1.29-1
    • 1.32-1
    • 1.33-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libnet-dns-perl Ubuntu:24.04:LTS

    Versions
    • 1.39-2ubuntu1
    • 1.40-1ubuntu1
    • 1.44-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libnet-dns-perl Ubuntu:26.10

    Versions
    • 1.54-1ubuntu1
    • 1.55-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libnet-dns-perl Ubuntu:26.04:LTS

    Versions
    • 1.50-1ubuntu1
    • 1.53-1ubuntu1
    • 1.54-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →