Vulnerability-Lookup

RHSA-2026:68786

Vulnerability from csaf_opensuse - Published: 2026-09-17 00:00 - Updated: 2026-09-18 17:15

Summary

security update for perl-Net-DNS

Severity

Important

Notes

Title of the patch: security update for perl-Net-DNS

Description of the patch: This security update provides a functional equivalent of RHSA-2026:68786. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:68786.

Patchnames: RHSA-2026:68786

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 2 products

Product	Identifier	Version	Remediation
Unresolved product id: SUSE Liberty Linux 9:perl-Net-DNS-0:1.29-6.el9_8.1.noarch		—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:perl-Net-DNS-Nameserver-0:1.29-6.el9_8.1.noarch		—	Vendor Fix

Threats

Impact moderate

References

5 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://www.suse.com/security/cve/CVE-2026-81928/	self
https://www.suse.com/security/cve/CVE-2026-81928	external
https://bugzilla.suse.com/1278084	external

JSON

To clipboard

{
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      ],
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        {
          "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.",
          "title": "CVE description"
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          "product_ids": [
            "SUSE Liberty Linux 9:perl-Net-DNS-0:1.29-6.el9_8.1.noarch",
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        }
      ],
      "title": "CVE-2026-81928"
    }
  ]
}

CVE-2026-81928 (GCVE-0-2026-81928)

Vulnerability from cvelistv5 – Published: 2026-09-01 23:14 – Updated: 2026-09-02 19:24

Title

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

Summary

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. sig_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. The 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. Each cycle re-encodes the whole message, so fewer than 100 bytes on the wire exhaust available memory and terminate the process.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 19:23 UTC

CWE

CWE-674 - Uncontrolled Recursion

Assigner

CPANSec redhat root

References

6 references

URL	Tags
https://metacpan.org/release/NLNETLABS/Net-DNS-1.…
https://metacpan.org/release/NLNETLABS/Net-DNS-1.…
https://datatracker.ietf.org/doc/html/rfc8945#sec…
https://rt.cpan.org/Ticket/Display.html?id=181125	issue-tracking
https://metacpan.org/release/NLNETLABS/Net-DNS-1.…	release-notes
http://www.openwall.com/lists/oss-security/2026/09/02/1

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 1.57 (custom)

Credits

Naseeb Dangi and Xiang Li from AOSP Lab @ Nankai University

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-02T10:08:21.418Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/09/02/1"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-81928",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T19:23:53.602465Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-02T19:24:12.656Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Net::DNS"
          ],
          "packageName": "Net-DNS",
          "packageURL": "pkg:cpan/Net-DNS",
          "programFiles": [
            "lib/Net/DNS/RR/TSIG.pm"
          ],
          "programRoutines": [
            {
              "name": "Net::DNS::RR::TSIG::sig_data"
            }
          ],
          "repo": "https://www.net-dns.org/svn/net-dns/",
          "versions": [
            {
              "lessThan": "1.57",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "reporter",
          "value": "Naseeb Dangi and Xiang Li from AOSP Lab @ Nankai University"
        }
      ],
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        {
          "lang": "en",
          "value": "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."
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-674 Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
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        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "url": "https://metacpan.org/release/NLNETLABS/Net-DNS-1.56/source/lib/Net/DNS/RR/TSIG.pm#L245-262"
        },
        {
          "url": "https://metacpan.org/release/NLNETLABS/Net-DNS-1.56/source/lib/Net/DNS/RR/TSIG.pm#L62-73"
        },
        {
          "url": "https://datatracker.ietf.org/doc/html/rfc8945#section-5.2"
        },
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          "url": "https://rt.cpan.org/Ticket/Display.html?id=181125"
        },
        {
          "tags": [
            "release-notes"
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          "url": "https://metacpan.org/release/NLNETLABS/Net-DNS-1.57/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to Net-DNS 1.57 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "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",
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          "lang": "en",
          "value": "For deployments that are not able to upgrade to Net-DNS 1.57, reject a decoded message before re-encoding it if a TSIG record appears anywhere but the final position of the additional section."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-81928",
    "datePublished": "2026-09-01T23:14:52.133Z",
    "dateReserved": "2026-08-27T18:31:50.335Z",
    "dateUpdated": "2026-09-02T19:24:12.656Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.