CVE-2026-68968
Apache Airflow's Backfill API authorized a request against a Dag id supplied by the caller whenever the `backfill_id` path segment failed to parse. The authorization dependency parsed it with `int()` while the route handler parsed it as pydantic's `NonNegativeInt`, which accepts values `int()` rejects (`1.0` coerces to `1`); FastAPI resolves dependencies before endpoint validation, so the two acted on different Dags. An authenticated user holding edit permission on any single Dag could therefore read, pause and cancel backfills belonging to any other Dag, including moving another Dag's queued runs to `failed`. No non-default configuration is required and backfill ids are sequential, so finding a target is trivial. Users are advised to upgrade to apache-airflow 3.3.1 or later, which parses the backfill id with the same type the routes declare.
Scoring
- Severity
- HIGH
- CVSS base score
- 7.5
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS probability
- 0.42%
- CWE
- CWE-436
- Published
- 2026-08-12
- Last modified
- 2026-08-18
Affected products
- Apache Software Foundation Apache Airflow
Weakness type
Related vulnerabilities
- CVE-2026-87627 — Interpretation conflict in Safebrowsing in Google Chrome on on Mac prior to 153.0.8010.36 allowed a...
- CVE-2026-82537 — Roo-Code 3.54.0 Auto-Approve Bypass via Shell Parser Word-Boundary Mismatch
- CVE-2026-81378 — Visual Studio Code Security Feature Bypass Vulnerability
- CVE-2026-85184 — @fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target
- CVE-2026-84394 — fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority
- CVE-2026-63435 — Mail: Email address spoofing via malformed RFC 2047 encoded-words
- CVE-2026-75931 — fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references
- CVE-2026-57580 — authentik: Account Takeover via SAML NameID Comment Truncation