Bug 2499690 (CVE-2026-49478) - CVE-2026-49478 github.com/sigstore/fulcio: Fulcio: Server-Side Request Forgery and Kubernetes ServiceAccount token leakage
Summary: CVE-2026-49478 github.com/sigstore/fulcio: Fulcio: Server-Side Request Forger...
Keywords:
Status: NEW
Alias: CVE-2026-49478
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-13 14:40 UTC by OSIDB Bzimport
Modified: 2026-08-24 12:33 UTC (History)
100 users (show)

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Description OSIDB Bzimport 2026-07-13 14:40:31 UTC 
Three vulnerabilities in Fulcio's OIDC Discovery client: (1) Blind SSRF via cross-host redirects during discovery metadata fetch, (2) JWKS substitution and cache poisoning via manipulated jwks_uri pointing to attacker-controlled host, (3) Kubernetes ServiceAccount token leakage to third-party hosts via cross-host redirects or wildcard MetaIssuers. No workaround available. Fixed in Fulcio v1.8.6.
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