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OPENSUSE-SU-2026:21437-1

Vulnerability from csaf_opensuse - Published: 2026-07-22 20:52 - Updated: 2026-09-17 17:40
Summary
Security update for perl-Net-DNS
Severity
Critical
Notes
Title of the patch: Security update for perl-Net-DNS
Description of the patch: This update for perl-Net-DNS fixes the following issues: Changes in perl-Net-DNS: - CVE-2026-64194: Fixed a Denial of Service via deep DNS compression pointer chains [bsc#1272214] - CVE-2026-64193: Fixed a remote execution injection [bsc#1272212]
Patchnames: openSUSE-Leap-16.0-packagehub-440
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-64193
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:perl-Net-DNS-0:1.460.0-bp160.2.1.noarch —
Vendor Fix
Threats
Impact important
CVE-2026-64194
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 1 product, the same list as for CVE-2026-64193
Threats
Impact important
References
To clipboard 

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        "title": "Title of the patch"
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        "text": "This update for perl-Net-DNS fixes the following issues:\n\nChanges in perl-Net-DNS:\n\n- CVE-2026-64194: Fixed a Denial of Service via deep DNS compression pointer chains [bsc#1272214]\n- CVE-2026-64193: Fixed a remote execution injection [bsc#1272212]\n",
        "title": "Description of the patch"
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    "title": "Security update for perl-Net-DNS",
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      ],
      "notes": [
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          "category": "general",
          "text": "Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR.\n\nNet::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\u0027s eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt-\u003eedns-\u003eoption(\u0027EXTENDED-ERROR\u0027) is called in array context, for example with a payload of {0:`\"\u003ccommand\u003e\"`} in EXTRA-TEXT.",
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      "notes": [
        {
          "category": "general",
          "text": "Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains.\n\nNet::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth limit. It is possible to construct a name which saturates the call stack (at least with larger TCP responses), leading to a potential Denial of Service.\n\nThe guard `$link \u003c $offset` prevents forward and circular chains, but still allows arbitrarily long backward chains. The per-offset cache (`$cache`) is populated at the start of each call and short-circuits only re-traverses of the same offset - the initial descent through a fresh chain still recurses at full depth.\n\nA crafted packet can chain two-byte compression pointers so that each one points two bytes earlier than the previous, producing a chain length of `offset / 2`. For the 14-bit pointer field (max offset 16383) this gives up to ~8191 recursive frames. For a TCP DNS message the limit is the 16-bit length field (~32767 frames). Perl\u0027s default C stack handles only a few thousand frames; beyond that the process receives SIGSEGV or similar, which is a denial-of-service for any application parsing untrusted DNS data.\n\nThe vulnerability is triggered by `Net::DNS::Packet-\u003enew(\\$wire)` i.e. any point where the library decodes a DNS message from the network.",
          "title": "CVE description"
        }
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    }
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}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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