Vulnerability-Lookup

GHSA-Q9CP-6GG7-9CPM

Vulnerability from github – Published: 2026-10-19 15:32 – Updated: 2026-10-22 03:33

Details

libtins through 4.6 contains a heap out-of-bounds read vulnerability in DNS::compose_name in src/dns.cpp that allows remote attackers to read past the packet buffer by sending a label ending exactly at the packet end. Attackers can deliver crafted DNS packets whose additional, answer, or authority records trigger a one-byte read when parsed, crashing applications on hardened allocators.

Severity

5.3 (Medium)


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

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-112273"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-19T14:17:05Z",
    "severity": "MODERATE"
  },
  "details": "libtins through 4.6 contains a heap out-of-bounds read vulnerability in DNS::compose_name in src/dns.cpp that allows remote attackers to read past the packet buffer by sending a label ending exactly at the packet end. Attackers can deliver crafted DNS packets whose additional, answer, or authority records trigger a one-byte read when parsed, crashing applications on hardened allocators.",
  "id": "GHSA-q9cp-6gg7-9cpm",
  "modified": "2026-10-22T03:33:30Z",
  "published": "2026-10-19T15:32:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112273"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mfontanini/libtins"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mfontanini/libtins/blob/v4.6/src/dns.cpp#L338-L389"
    },
    {
      "type": "WEB",
      "url": "https://hackmd.io/@haindpwn/cve-2026-112273-112274-libtins-dns-name-parsing-oob-read"
    },
    {
      "type": "WEB",
      "url": "https://hackmd.io/@haindpwn/libtins-dns-name-parsing-oob-read"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/libtins-through-4.6-heap-out-of-bounds-read-via-dns-compose-name"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-112273 (GCVE-0-2026-112273)

Vulnerability from cvelistv5 – Published: 2026-10-19 13:55 – Updated: 2026-10-22 02:51

Title

libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name

Summary

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-22 02:49 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6966 records in the last 180 days details

References

5 references

URL	Tags
https://hackmd.io/@haindpwn/libtins-dns-name-pars…	third-party-advisory
https://github.com/mfontanini/libtins/blob/v4.6/s…	technical-description
https://github.com/mfontanini/libtins	product
https://www.vulncheck.com/advisories/libtins-thro…	third-party-advisory
https://hackmd.io/@haindpwn/cve-2026-112273-11227…	exploit

Impacted products

1 product

Vendor	Product	Version
libtins	libtins	Affected: 0 , ≤ 4.6 (custom)

Date Public

2026-10-17 18:49

Credits

HaiND from the Post and Telecommunication Institute of Technology

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-112273",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-22T02:49:37.004511Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-22T02:51:25.912Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
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            "tags": [
              "exploit"
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          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
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          "collectionURL": "https://github.com/mfontanini/libtins",
          "defaultStatus": "unaffected",
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          "vendor": "libtins",
          "versions": [
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              "status": "affected",
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            }
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      "credits": [
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          "value": "HaiND from the Post and Telecommunication Institute of Technology"
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            "subConfidentialityImpact": "NONE",
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            "vulnIntegrityImpact": "NONE"
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        {
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          "url": "https://hackmd.io/@haindpwn/libtins-dns-name-parsing-oob-read"
        },
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          "url": "https://github.com/mfontanini/libtins"
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          "name": "VulnCheck Advisory: libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name",
          "tags": [
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  "cveMetadata": {
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    "datePublished": "2026-10-19T13:55:20.684Z",
    "dateReserved": "2026-10-19T13:25:28.347Z",
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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

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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.
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