Vulnerability-Lookup

GHSA-CCHP-25PR-R776

Vulnerability from github – Published: 2026-10-12 21:31 – Updated: 2026-10-12 21:31

Details

Vercel deepsec from 0.1.0 before 1.1.17 contains a link following vulnerability in extractTarballLocally that allows sandboxed code to write files outside the sandbox by planting links in result tarballs. Attackers controlling sandbox code, such as a prompt-injected coding agent, can plant symbolic or hard links in the host data directory to write arbitrary files on the orchestrator host.

Severity

6.1 (Medium)


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

4.9 (Medium)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-109375"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-12T21:17:10Z",
    "severity": "MODERATE"
  },
  "details": "Vercel deepsec from 0.1.0 before 1.1.17 contains a link following vulnerability in extractTarballLocally that allows sandboxed code to write files outside the sandbox by planting links in result tarballs. Attackers controlling sandbox code, such as a prompt-injected coding agent, can plant symbolic or hard links in the host data directory to write arbitrary files on the orchestrator host.",
  "id": "GHSA-cchp-25pr-r776",
  "modified": "2026-10-12T21:31:58Z",
  "published": "2026-10-12T21:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109375"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vercel-labs/deepsec/pull/46"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vercel-labs/deepsec/pull/47"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vercel-labs/deepsec/commit/c5a4e4220ece72aee67c2ea21f4340e65f673fc1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vercel-labs/deepsec"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/vercel-deepsec-before-1.1.17-arbitrary-file-write-via-symlink-in-sandbox-tarball-extraction"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:H/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-2026-109375 (GCVE-0-2026-109375)

Vulnerability from cvelistv5 – Published: 2026-10-12 20:55 – Updated: 2026-10-13 15:45

Title

Vercel deepsec before 1.1.17 Arbitrary File Write via Symlink in Sandbox Tarball Extraction

Summary

Severity

4.9 (Medium)


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

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-13 15:44 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6104 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/vercel-labs/deepsec/pull/46	issue-trackingpatch
https://github.com/vercel-labs/deepsec/pull/47	patchissue-tracking
https://github.com/vercel-labs/deepsec/commit/c5a…	patch
https://github.com/vercel-labs/deepsec	product
https://www.vulncheck.com/advisories/vercel-deeps…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Vercel	deepsec	Affected: 0.1.0 , < 1.1.17 (semver) Unaffected: 1.1.17 (semver)

Date Public

2026-05-05 00:00

Credits

Yunus Aydın

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-109375",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-13T15:44:46.422330Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-13T15:45:01.735Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/deepsec",
          "product": "deepsec",
          "repo": "https://github.com/vercel-labs/deepsec",
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            }
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      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Yunus Ayd\u0131n"
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          "lang": "en",
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            "subConfidentialityImpact": "NONE",
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          "cvssV3_1": {
            "attackComplexity": "HIGH",
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            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N",
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    "dateReserved": "2026-10-12T14:23:25.691Z",
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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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