Docling: Unsafe URI and Path Handling in HTML Backend

### Impact The HTML backend did not perform sufficient validation during resource handling: - Accepted `file://` URIs enabling local file system access when `enable_local_fetch=True` - Path resolution allowed traversal outside intended directories via `../` sequences and absolute paths - Did not block internal network resources under `enable_remote_fetch=True` - HTTP redirects were not validated, potentially redirecting to unintended schemes - No resource limits for remote image downloads and `data:` URIs ### Patches Fixed in versions 2.91.0 (initial fixes) and 2.94.0 (additional improvements). The fixes implement: - Updated local path treatment: absolute files always blocked, relative paths require `enable_local_fetch=True` (default: False) and containment within configured `base_path` for path traversal protection - `file://` scheme stripped & treated as local path (above) - IP address validation to prevent SSRF - HTTP redirect validation, connection and read timeouts - Size limit for both remote images (with streaming download) and base64-decoded data URIs ### Workarounds Keep both `enable_local_fetch=False` and `enable_remote_fetch=False` (defaults) when processing untrusted HTML documents. ### References - Initial fixes: [v2.91.0](https://github.com/docling-project/docling/releases/tag/v2.91.0) - Additional improvements: [v2.94.0](https://github.com/docling-project/docling/releases/tag/v2.94.0)

CVSS 3.1

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

Severity from

GitHub (reviewed advisory)

Weakness

CWE-400, CWE-73

Also known as

CVE-2026-47214, PYSEC-2026-2146

• github.com/docling-project/docling/security/advisories/GHSA-q29v-xc37-wh5m
• nvd.nist.gov/vuln/detail/CVE-2026-47214
• github.com/docling-project/docling/pull/3400
• github.com/docling-project/docling/pull/3407
• github.com/docling-project/docling
• github.com/docling-project/docling/releases/tag/v2.91.0
• github.com/docling-project/docling/releases/tag/v2.94.0
• github.com/pypa/advisory-database/tree/main/vulns/docling/PYSEC-2026-2146.yaml