# datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding Advisory record · `GHSA-vx7x-vcc2-c44g` - **Identifiers:** `GHSA-vx7x-vcc2-c44g` · `CVE-2026-55391` · `PYSEC-2026-3565` - **State:** Confirmed - **Severity:** CVSS 7.5 High - **Critical:** No - **Weakness (CWE):** [CWE-350](https://cwe.mitre.org/data/definitions/350.html) · [CWE-367](https://cwe.mitre.org/data/definitions/367.html) · [CWE-918](https://cwe.mitre.org/data/definitions/918.html) - **Tags:** [Race condition](https://agentprime.io/advisories/tag/race-condition.md) · [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md) · [CWE-350](https://agentprime.io/advisories/tag/cwe-350.md) - **Published:** 28 Jul 2026 - **Updated:** 10 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 28 Jul 2026, 21:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `datamodel-code-generator` (PyPI): affected `<0.63.0`; fixed in `0.63.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > datamodel-code-generator versions before 0.63.0 are vulnerable to a server-side request forgery bypass of its anti-SSRF guard via DNS rebinding. The guard checks a host's resolved IP once, but the HTTP client resolves the host again when connecting, so a hostname can pass the check with a public address and then connect to a private or loopback address, such as cloud metadata endpoints. An attacker who can influence a URL the tool fetches, through --url or a remote $ref, can reach internal services. Upgrade to version 0.63.0 or later. Written 1 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0031, the 23rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:10 UTC: First seen by agentprime - 31 Oct 2026, 14:10 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-vx7x-vcc2-c44g) ## Sources - [GitHub Advisory Database: GHSA-vx7x-vcc2-c44g](https://github.com/advisories/GHSA-vx7x-vcc2-c44g) - [OSV: GHSA-vx7x-vcc2-c44g](https://osv.dev/vulnerability/GHSA-vx7x-vcc2-c44g) - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .