GHSA-4J89-2C4F-44C6低危已审查

Gogs has DoS in rendering issue index pattern

OSV 1.4.0 · github-reviewed · 修改于 2026-07-21 21:17

发布时间

2026-06-23 07:58

GitHub 审查时间

2026-06-23 07:58

NVD 发布时间

2026-06-25 05:16

源文件

advisories/github-reviewed/2026/06/GHSA-4j89-2c4f-44c6/GHSA-4j89-2c4f-44c6.json

公告说明

Summary

Special template of issue index pattern may cause panic.

Details

in internal/markup/markup.go

link = fmt.Sprintf(`<a href="%s">%s</a>`, com.Expand(metas["format"], metas), m)

Issue index pattern is rendered to link with com.Expand.

However, com.Expand is not safe.

i = strings.Index(template, "}")
if s, ok := match[template[:i]]; ok {

when { is found but } not found, i comes to 1, template[:-1] will be called, and then panicked

finally, all pages than contains issue index are unavailable.

PoC

set issue index pattern as follow

add a commit which point to an issue in its msg

using #1 above

Impact

DoS that cause part of pages of the specify repo unavailable.

受影响的软件包

标识信息

别名 / CVE

CVE-2026-52796

CWE

CWE-1336

软件生态

扩展资料

暂无扩展资料。

CVSS 评分

CVSS_V3

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

原始 OSV JSON

{
  "id": "GHSA-4j89-2c4f-44c6",
  "aliases": [
    "CVE-2026-52796"
  ],
  "details": "### Summary\nSpecial template of issue index pattern may cause panic.\n\n### Details\n\nin internal/markup/markup.go\n\n```go\nlink = fmt.Sprintf(`<a href=\"%s\">%s</a>`, com.Expand(metas[\"format\"], metas), m)\n```\n\nIssue index pattern is rendered to link with `com.Expand`.\n\nHowever, `com.Expand` is not safe.\n\n```go\ni = strings.Index(template, \"}\")\nif s, ok := match[template[:i]]; ok {\n```\n\nwhen `{` is found but `}` not found, i comes to 1, template[:-1] will be called, and then panicked\n\n![image](https://user-images.githubusercontent.com/38121125/285883766-64873c44-d325-44ce-96a8-badbaadab178.png)\n\nfinally, all pages than contains issue index are unavailable.\n\n### PoC\n\n1. set issue index pattern as follow\n\n![image](https://user-images.githubusercontent.com/38121125/285878157-c5fe848e-0fbd-4fdb-92d4-5eb01df2b8ca.png)\n\n2. add a commit which point to an issue in its msg\n\n![image](https://user-images.githubusercontent.com/38121125/285879545-bc360503-49b9-453f-aa24-9a5c5a45cf10.png)\n\nusing `#1` above\n\n### Impact\n\nDoS that cause part of pages of the specify repo unavailable.",
  "summary": "Gogs has DoS in rendering issue index pattern",
  "affected": [
    {
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.14.3"
            }
          ]
        }
      ],
      "package": {
        "name": "gogs.io/gogs",
        "ecosystem": "Go"
      },
      "database_specific": {
        "last_known_affected_version_range": "<= 0.14.2"
      }
    }
  ],
  "modified": "2026-07-21T13:17:05Z",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L"
    }
  ],
  "published": "2026-06-22T23:58:17Z",
  "references": [
    {
      "url": "https://github.com/gogs/gogs/security/advisories/GHSA-4j89-2c4f-44c6",
      "type": "WEB"
    },
    {
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52796",
      "type": "ADVISORY"
    },
    {
      "url": "https://github.com/gogs/gogs/pull/8312",
      "type": "WEB"
    },
    {
      "url": "https://github.com/gogs/gogs/commit/0529d95fc39f2b6d2997b19a2a12e24522684722",
      "type": "WEB"
    },
    {
      "url": "https://github.com/gogs/gogs",
      "type": "PACKAGE"
    },
    {
      "url": "https://github.com/gogs/gogs/releases/tag/v0.14.3",
      "type": "WEB"
    }
  ],
  "schema_version": "1.4.0",
  "database_specific": {
    "cwe_ids": [
      "CWE-1336"
    ],
    "severity": "LOW",
    "github_reviewed": true,
    "nvd_published_at": "2026-06-24T21:16:55Z",
    "github_reviewed_at": "2026-06-22T23:58:17Z"
  }
}