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OPENSUSE-SU-2026:21859-1

Vulnerability from csaf_opensuse - Published: 2026-09-15 13:20 - Updated: 2026-09-17 17:44
Summary
Security update for perl-Net-DNS
Severity
Moderate
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: Updated to 1.570.0 (1.57): See /usr/share/doc/packages/perl-Net-DNS/Changes . - Resync with IANA DNS parameters registry. - EDNS: Add support for MQTYPE-QUERY option. - Unbounded recursion when re-encoding message with misplaced TSIG CVE-2026-81928 bsc#1278084 - UNIX resolver can fail in taint mode - Documentation issue for Net::DNS::RR::RRSIG::verify() - Denial of Service via long DNS compression chains CVE-2026-64194 bsc#1272214 - Remote code injection via EDNS EXTENDED ERROR CVE-2026-64193 bsc#1272212 - UNIX.pm: Unreachable code warning using Apache/mod_perl
Patchnames: openSUSE-Leap-16.0-packagehub-591
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-0:1.570.0-bp160.1.1.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
CVE-2026-81928
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
Recommended 1 product, the same list as for CVE-2026-64193
Threats
Impact moderate
References
To clipboard 

{
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    "distribution": {
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        "text": "Security update for perl-Net-DNS",
        "title": "Title of the patch"
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        "category": "description",
        "text": "This update for perl-Net-DNS fixes the following issues:\n\nChanges in perl-Net-DNS:\n\nUpdated to 1.570.0 (1.57):\n\nSee /usr/share/doc/packages/perl-Net-DNS/Changes .\n\n  -     Resync with IANA DNS parameters registry.\n  -     EDNS: Add support for MQTYPE-QUERY option.\n  -     Unbounded recursion when re-encoding message with misplaced TSIG CVE-2026-81928 bsc#1278084\n  -     UNIX resolver can fail in taint mode\n\n  -     Documentation issue for Net::DNS::RR::RRSIG::verify()\n  -     Denial of Service via long DNS compression chains CVE-2026-64194 bsc#1272214\n  -     Remote code injection via EDNS EXTENDED ERROR CVE-2026-64193 bsc#1272212\n  -     UNIX.pm: Unreachable code warning using Apache/mod_perl\n",
        "title": "Description of the patch"
      },
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          "text": "https://www.suse.com/security/cve/CVE-2026-64193"
        }
      ],
      "notes": [
        {
          "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 $pkt-\u003eedns-\u003eoption(\u0027EXTENDED-ERROR\u0027) is called in array context, for example with a payload of {0:`\"\u003ccommand\u003e\"`} in EXTRA-TEXT.",
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          "text": "https://www.suse.com/security/cve/CVE-2026-64194"
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      ],
      "notes": [
        {
          "category": "general",
          "text": "Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains.\n\nNet::DNS::DomainName::decode follows RFC 1035 compression pointers by recursing into itself with no depth limit. It is possible to construct a name which saturates the call stack (at least with larger TCP responses), leading to a potential Denial of Service.\n\nThe guard `$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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          "text": "https://www.suse.com/security/cve/CVE-2026-81928"
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      ],
      "notes": [
        {
          "category": "general",
          "text": "Net::DNS versions before 1.57 for Perl allow memory exhaustion via unbounded recursion in sig_data when re-encoding a message with a misplaced TSIG record.\n\nsig_data signs a message by re-encoding it, and removes TSIG records only from the additional section. A TSIG decoded into the answer or authority section survives that step and is signed again, so encoding re-enters sig_data with no termination condition. Decoding does not reject such a message: a TSIG that is not the last record on the wire raises \"misplaced or corrupt TSIG\", but the error is caught, reported as a warning, and the record is left in the packet. RFC 8945 section 5.2 requires the message to be dropped.\n\nThe recursion is reached only when the decoded TSIG carries an empty MAC, since a MAC recovered from the wire short-circuits the signing step. It is reached only from code that re-encodes a message it decoded, such as a forwarder or a proxy. A decoded message that is never re-encoded is unaffected. Message direction does not matter: a query reaches the same path as a response.\n\nEach cycle re-encodes the whole message, so fewer than 100 bytes on the wire exhaust available memory and terminate the process.",
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    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.