CVE-2026-55403: datamodel-code-generator generates Python data models from schema definitions. Prior to 0.63.0, src/datamodel_code_generator/http.py get_body reuses Authorization, Cookie, and Prox

lowCVSS 3.7CVE-2026-55403

datamodel-code-generator generates Python data models from schema definitions. Prior to 0.63.0, src/datamodel_code_generator/http.py get_body reuses Authorization, Cookie, and Proxy-Authorization headers when following cross-origin redirects while fetching remote schemas, allowing credentials scoped to one schema host to be leaked to another redirect target. This issue is fixed in version 0.63.0.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: low — CVSS 3.7
Published: 2026-07-28
Last updated: 2026-07-30
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55403

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-554030.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55403	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

lowGHSA-r5vv-ff45-prp2: datamodel-code-generator: Authorization / request headers leaked to cross-origin redirect…ghsa

Recent advisories for datamodel-code-generator generates Python

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-55390: datamodel-code-generator generates Python data models from schema definitions. From 0.59.0 unt…nvd · 2026-07-28
highCVE-2026-54691: datamodel-code-generator generates Python data models from schema definitions. From 0.9.1 unti…nvd · 2026-07-28
highCVE-2026-54655: datamodel-code-generator generates Python data models from schema definitions. From 0.51.0 unt…nvd · 2026-07-28
highCVE-2026-54654: datamodel-code-generator generates Python data models from schema definitions. From 0.14.1 unt…nvd · 2026-07-28
highCVE-2026-54621: datamodel-code-generator generates Python data models from schema definitions. Prior to 0.60.1…nvd · 2026-07-28
highGHSA-5578-w22f-pfx9: datamodel-code-generator vulnerable to code injection via `x-python-import` / `customType…ghsa · 2026-07-28