Vulnerability-Lookup

GHSA-6CQ2-4J8W-7HVJ

Vulnerability from github – Published: 2026-11-03 18:31 – Updated: 2026-11-03 18:31

Details

Solanum before commit 2ea1382 contains a buffer overflow vulnerability in ms_kill() that allows malicious linked servers to corrupt memory by sending an overlong kill reason. Attackers controlling a rogue or compromised peer server can send a reason exceeding KILLLEN that overflows a static 512-byte buffer, crashing the ircd or potentially achieving remote code execution.

Severity

6.5 (Medium)


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

8.5 (High)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-121603"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-03T17:18:11Z",
    "severity": "HIGH"
  },
  "details": "Solanum before commit 2ea1382 contains a buffer overflow vulnerability in ms_kill() that allows malicious linked servers to corrupt memory by sending an overlong kill reason. Attackers controlling a rogue or compromised peer server can send a reason exceeding KILLLEN that overflows a static 512-byte buffer, crashing the ircd or potentially achieving remote code execution.",
  "id": "GHSA-6cq2-4j8w-7hvj",
  "modified": "2026-11-03T18:31:09Z",
  "published": "2026-11-03T18:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121603"
    },
    {
      "type": "WEB",
      "url": "https://github.com/solanum-ircd/solanum/pull/550"
    },
    {
      "type": "WEB",
      "url": "https://github.com/solanum-ircd/solanum/commit/2ea1382e4262b212a91034258c466f0f6754cd61"
    },
    {
      "type": "WEB",
      "url": "https://github.com/solanum-ircd/solanum"
    },
    {
      "type": "WEB",
      "url": "https://github.com/solanum-ircd/solanum/blob/7bc7e34c04711247b932666e19ae900cba884540/modules/core/m_kill.c#L277"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/solanum-before-commit-2ea1382-buffer-overflow-via-server-to-server-kill-handler"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/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-2026-121603 (GCVE-0-2026-121603)

Vulnerability from cvelistv5 – Published: 2026-11-03 16:26 – Updated: 2026-11-03 17:17

Title

Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL Handler

Summary

Severity

8.5 (High)


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

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-03 17:15 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7415 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/solanum-ircd/solanum/pull/550	issue-trackingpatch
https://github.com/solanum-ircd/solanum/commit/2e…	patch
https://github.com/solanum-ircd/solanum/blob/7bc7…	technical-description
https://github.com/solanum-ircd/solanum	product
https://www.vulncheck.com/advisories/solanum-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
solanum-ircd	solanum	Affected: 0 , < 2ea1382e4262b212a91034258c466f0f6754cd61 (git)

Date Public

2026-08-15 00:00

Credits

Tristan Madani (Talence Security) aaronmdjones

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-121603",
                "options": [
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                  },
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                    "Technical Impact": "total"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-11-03T17:15:57.210109Z",
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        },
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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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