Low [CVE-2026-48978] Information disclosure and TLS downgrade via malicious registry realm
This low-severity Red Hat Linux advisory covers CVE-2026-48978 affecting Gatekeeper 3, Multicluster Global Hub, OpenShift Service Mesh 3.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
oras-go is a Go library for managing OCI artifacts. Prior to 2.6.1, auth.
Client follows the realm URL from a registry's WWW-Authenticate: Bearer challenge without validating the scheme or host, allowing a malicious or compromised registry to cause SSRF to internal networks such as,, and, or to downgrade a registry contacted over https:// to an http:// token endpoint in registry/remote/auth/client.go through Client.Do(), Client.fetchBearerToken(), fetchDistributionToken, and fetchOAuth2Token.
This issue is fixed in version 2.6.1. A flaw was found in oras-go.
A remote attacker, operating a malicious registry or performing a man-in-the-middle attack, could exploit this to perform Server-Side Request Forgery (SSRF) against internal networks, potentially disclosing sensitive information.
Additionally, the flaw could lead to a Transport Layer Security (TLS) downgrade, causing user credentials to be sent over plaintext. Red Hat severity: Low — CVSS 3.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).
Weakness: CWE-918. Affected Red Hat products: Gatekeeper 3; Multicluster Global Hub; OpenShift Service Mesh 3; Red Hat OpenShift Container Platform 4; Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1; Red Hat OpenStack Platform 18.0.
Red Hat does not currently list a fixing RHSA for this CVE.
Is CVE-2026-48978 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-48978 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-48978?
Upgrade to a fixed release named by Red Hat:
- 2.6.1
Confirm against the vendor advisory before you patch.
- < 2.6.1
- < 169.254.169.254
- < 10.0.0.x
- < 127.0.0.1
- 10.0.0
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- Upgrade to oras-go v2.6.1 or later.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Get an email when Red Hat publishes the next one.
See Red Hat's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
More Red Hat Linux advisories
- CVE-2026-119977Oct 31, 2026Arbitrary code execution via predictable upgrade staging paths
- CVE-2026-111497Oct 22, 2026Out-of-Bounds Write in Google Brotli Decoder
- CVE-2026-109619Oct 21, 2026fatal error handling retains stale request state leading to use-after-free
- CVE-2026-109618Oct 21, 2026OOM bailout during request parsing leads to memory corruption and RCE
- CVE-2026-97229Oct 13, 2026integer overflow issue in CI/CD regular expression compiler
- CVE-2026-64849Aug 17, 2026Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed
iPhone and Android apps · New on the App Store
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.