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Advisory record · GHSA-vx7x-vcc2-c44g

datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding

CVSS 7.5 HighEPSS 0.0031 · 23rd percentile

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.

PackageEcosystemAffectedFixed in
datamodel-code-generatorPyPI<0.63.00.63.0
Identifiers
GHSA-vx7x-vcc2-c44g · CVE-2026-55391 · PYSEC-2026-3565
Weakness (CWE)
CWE-350 · CWE-367 · CWE-918
Tags
Published
28 Jul 2026
Updated
10 Sept 2026

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

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N 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

  1. 31 Oct 2026, 14:10 UTC First seen by agentprime
  2. 31 Oct 2026, 14:10 UTC Confirmed by OSV

Sources

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.