Vulnerability-Lookup

SUSE-SU-2026:3431-1

Vulnerability from csaf_suse - Published: 2026-07-30 18:50 - Updated: 2026-09-17 16:37

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 update for perl-Net-DNS fixes the following issue - CVE-2026-64194: RFC 1035 compression pointers are followed via recursion with no depth limit established, which can lead to DoS when specially crafted DNS packets are parsed (bsc#1272214).

Patchnames: SUSE-2026-3431,SUSE-SLE-SERVER-12-SP5-LTSS-2026-3431,SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-3431

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 17 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64	—	Vendor Fix

Threats

Impact important

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-updates/2026…	self
https://bugzilla.suse.com/1272214	self
https://www.suse.com/security/cve/CVE-2026-64194/	self
https://www.suse.com/security/cve/CVE-2026-64194	external
https://bugzilla.suse.com/1272214	external

JSON

To clipboard

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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-64194",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-64194"
        }
      ],
      "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"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
          "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
          "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
          "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
          "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.aarch64",
          "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
          "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.s390x",
          "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.x86_64",
          "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
          "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
          "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
          "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
          "SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-64194",
          "url": "https://www.suse.com/security/cve/CVE-2026-64194"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1272214 for CVE-2026-64194",
          "url": "https://bugzilla.suse.com/1272214"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise High Performance Computing 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise Server 12 SP5-LTSS:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise Server 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.aarch64",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.ppc64le",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.s390x",
            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:perl-Net-DNS-0:0.73-5.3.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-07-30T18:50:12Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-64194"
    }
  ]
}

CVE-2026-64194 (GCVE-0-2026-64194)

Vulnerability from cvelistv5 – Published: 2026-07-20 17:55 – Updated: 2026-08-30 20:06

Title

Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains

Summary

Net::DNS versions through 1.55 for Perl allow Denial of Service via deep DNS compression pointer chains. Net::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. The guard `$link < $offset` prevents forward and circular chains, but still allows arbitrarily long backward chains. The per-offset cache (`$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. A 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's 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. The vulnerability is triggered by `Net::DNS::Packet->new(\$wire)` i.e. any point where the library decodes a DNS message from the network.

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 2026-07-21 18:55 UTC

CWE

CWE-674 - Uncontrolled Recursion

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 62/100 over 369 records in the last 180 days details

References

5 references

URL	Tags
https://www.net-dns.org/blog/#release-candidate-f…
https://rt.cpan.org/Ticket/Display.html?id=179946	issue-tracking
https://metacpan.org/release/NLNETLABS/Net-DNS-1.…	release-notes
http://www.openwall.com/lists/oss-security/2026/0…
https://lists.debian.org/debian-lts-announce/2026…

Impacted products

1 product

Vendor	Product	Version
NLNETLABS	Net::DNS	Affected: 0 , ≤ 1.55 (custom)

Credits

Steffen Ullrich

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-08-30T20:06:49.756Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "http://www.openwall.com/lists/oss-security/2026/07/20/13"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2026/08/msg00052.html"
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        "title": "CVE Program Container"
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            "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-2026-64194",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-21T18:55:36.580996Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-07-21T18:56:01.149Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "packageName": "Net-DNS",
          "product": "Net::DNS",
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}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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