CVE-2026-18353
PIA's POST /v1/upload/sbom endpoint accepts a Bearer JWT and checks its unverified iss claim against an issuer allowlist using Python's urlparse before performing OIDC discovery with requests. Because urlparse and requests/urllib3 parse an authority string containing a backslash (e.g. https://attacker-host\@ci.eclipse.org/) into *different* hostnames, an attacker can craft an issuer that passes the allowlist check yet drives requests — and subsequently urllib.request.urlopen for JWKS retrieval — to connect to an arbitrary attacker-chosen host, port, and scheme.
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Exploitation outlook
- Low exploitation risk0.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
Advisory coverage (1)
External references
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[](https://www.csirts.com/cve/CVE-2026-18353)