CVE-2026-73539 (GCVE-0-2026-73539)

Vulnerability from cvelistv5 – Published: 2026-10-14 14:37 – Updated: 2026-10-14 14:37
VLAI
Title
Gitea external renderer argument injection and code execution
Summary
Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication.
Severity
No CVSS data available.
CWE
  • CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Assigner
Gitea CNA under the mitre root
CNA scorecard C 61/100 over 153 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Gitea Gitea Affected: 0 , ≤ 1.27.1 (semver)
guessed Create a notification for this product.
Credits
https://github.com/DshtAnger
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "gitea",
          "product": "Gitea",
          "vendor": "Gitea",
          "versions": [
            {
              "lessThanOrEqual": "1.27.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "https://github.com/DshtAnger"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-88",
              "description": "CWE-88: Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-14T14:37:44.243Z",
        "orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
        "shortName": "Gitea"
      },
      "references": [
        {
          "name": "GitHub Security Advisory GHSA-579w-82gf-89m2",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-579w-82gf-89m2"
        },
        {
          "name": "Gitea 1.27.2 release announcement",
          "tags": [
            "release-notes"
          ],
          "url": "https://blog.gitea.com/release-of-1.27.2/"
        },
        {
          "name": "Fix: go-gitea/gitea pull request #38885",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/go-gitea/gitea/pull/38885"
        },
        {
          "name": "Fix: go-gitea/gitea pull request #38898",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/go-gitea/gitea/pull/38898"
        },
        {
          "name": "go-gitea/gitea v1.27.2 release",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/go-gitea/gitea/releases/tag/v1.27.2"
        }
      ],
      "title": "Gitea external renderer argument injection and code execution"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
    "assignerShortName": "Gitea",
    "cveId": "CVE-2026-73539",
    "datePublished": "2026-10-14T14:37:44.243Z",
    "dateReserved": "2026-08-13T16:50:59.746Z",
    "dateUpdated": "2026-10-14T14:37:44.243Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "packageName": "gitea",
                "product": "Gitea",
                "vendor": "Gitea",
                "versions": [
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                    "lessThanOrEqual": "1.27.1",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
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            ],
            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication."
          }
        ],
        "id": "CVE-2026-73539",
        "lastModified": "2026-10-14T16:04:39.483",
        "metrics": {},
        "published": "2026-10-14T15:17:23.633",
        "references": [
          {
            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
            "url": "https://blog.gitea.com/release-of-1.27.2/"
          },
          {
            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
            "url": "https://github.com/go-gitea/gitea/pull/38885"
          },
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            "url": "https://github.com/go-gitea/gitea/pull/38898"
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            "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-579w-82gf-89m2"
          }
        ],
        "sourceIdentifier": "88ee5874-cf24-4952-aea0-31affedb7ff2",
        "vulnStatus": "Deferred",
        "weaknesses": [
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                "lang": "en",
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            ],
            "source": "88ee5874-cf24-4952-aea0-31affedb7ff2",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}



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