FKIE_CVE-2026-55078

Vulnerability from fkie_nvd - Published: 2026-07-07 23:16 - Updated: 2026-07-08 19:45
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `CreateTarFromZip`, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. Exploitation requires authenticated file-upload access and the impact is limited to availability (denial of service). The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 adds a metadata preflight check that sums projected entry sizes and a streaming writer that enforces the aggregate limit during decompression. As a workaround, restrict file-upload permissions to trusted users or place a reverse proxy with request-body size limits in front of `coderd`.
References
security-advisories@github.comhttps://github.com/coder/coder/pull/25877Issue Tracking, Patch
security-advisories@github.comhttps://github.com/coder/coder/releases/tag/v2.29.17Release Notes
security-advisories@github.comhttps://github.com/coder/coder/releases/tag/v2.32.7Release Notes
security-advisories@github.comhttps://github.com/coder/coder/releases/tag/v2.33.8Release Notes
security-advisories@github.comhttps://github.com/coder/coder/releases/tag/v2.34.2Release Notes
security-advisories@github.comhttps://github.com/coder/coder/security/advisories/GHSA-2mg2-p7r7-g27fPatch, Vendor Advisory
Impacted products
Vendor Product Version
coder coder *
coder coder *
coder coder *
coder coder *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "coder",
          "vendor": "coder",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.34.0, \u003c 2.34.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.33.0, \u003c 2.33.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.30.0, \u003c 2.32.7"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.17.0, \u003c 2.29.17"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "6197C053-9BC3-4F5B-8BBA-B47352F9653B",
              "versionEndExcluding": "2.29.17",
              "versionStartIncluding": "2.17.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "7ABD4A9B-6AE8-47D8-A1B7-91E42EE0481B",
              "versionEndExcluding": "2.32.7",
              "versionStartIncluding": "2.30.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "F759EEF3-6EAE-475B-85F8-38E7D7B47438",
              "versionEndExcluding": "2.33.8",
              "versionStartIncluding": "2.33.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "397A02BF-6CF6-40B1-B792-D7CB9D229050",
              "versionEndExcluding": "2.34.2",
              "versionStartIncluding": "2.34.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `CreateTarFromZip`, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. Exploitation requires authenticated file-upload access and the impact is limited to availability (denial of service). The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 adds a metadata preflight check that sums projected entry sizes and a streaming writer that enforces the aggregate limit during decompression. As a workaround, restrict file-upload permissions to trusted users or place a reverse proxy with request-body size limits in front of `coderd`."
    }
  ],
  "id": "CVE-2026-55078",
  "lastModified": "2026-07-08T19:45:05.967",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55078",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-08T13:54:48.796364Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-07T23:16:55.510",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/coder/coder/pull/25877"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/coder/coder/releases/tag/v2.29.17"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/coder/coder/releases/tag/v2.32.7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/coder/coder/releases/tag/v2.33.8"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/coder/coder/releases/tag/v2.34.2"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/coder/coder/security/advisories/GHSA-2mg2-p7r7-g27f"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-409"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.