SSRF (Server-Side Request Forgery) in datamodel-code-generator (CVE-2026-54690)
Summary
SSRF in datamodel-code-generator (CVE-2026-54690). Confidential information can be exposed externally. Exploitable via None. Mitigation: upgrade to 0.61.0 or later.
Original description
The description as published by the source.
Summary
JSON-Schema $ref values pointing at HTTP or HTTPS URLs are silently dereferenced by datamodel-code-generator with no IP/host validation, no scheme allow-list, and redirects followed unconditionally. The --allow-remote-refs gate added in 0.56.0 defaults to None, which only emits a deprecation warning and then fetches the URL anyway; only explicit --allow-remote-refs=false blocks the request. The fetched body is parsed as a sub-schema and reflected verbatim into the generated .py source. As a result, any JSON-Schema document the developer feeds to datamodel-codegen — including documents authored by an attacker — can pivot to arbitrary internal addresses and leak the response into the generated code, with no developer cooperation beyond running the tool.
Details
Sink: src/datamodel_code_generator/parser/jsonschema.py, _get_ref_body (lines 4776–4793, at tag 0.60.1 / commit a321547e):
def _get_ref_body(self, resolved_ref: str) -> dict[str, YamlValue]:
if is_url(resolved_ref):
if not resolved_ref.startswith("file://") and self.http_local_ref_path is None:
if self.allow_remote_refs is False:
raise Error(f"Fetching remote $ref is disabled: {resolved_ref}...")
if self.allow_remote_refs is None:
warn_deprecated( # (A) warn only
"behavior.remote-ref-default",
details=f"Reference: {resolved_ref}",…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-54690 has been found in datamodel-code-generator.
Attackers can target a specific entry point like None over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 8.2/10.
What to do: upgrade datamodel-code-generator to 0.61.0 or later.
If unsure, ask your IT team or search "datamodel-code-generator CVE-2026-54690" on the vendor's site.
CVE-2026-54690 (datamodel-code-generator) — CWE-918 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: None / _get_ref_body / a321547e / allow_remote_refs
Patched: 0.61.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
SSRF (CWE-918) exists in datamodel-code-generator. Attackers reach the vulnerable code path via None without authentication.
Check the vendor advisory for the affected versions of datamodel-code-generator. Attack surface: None / _get_ref_body / a321547e / allow_remote_refs.
Severity: High (CVSS 8.2/10). Confidential information can be exposed externally.
Update to 0.61.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'datamodel-code-generator' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'datamodel-code-generator' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
datamodel-code-generatorを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade datamodel-code-generator to 0.61.0ステージング環境で 0.61.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- package pypi.org
- web github.com
- web github.com
- web github.com