In Eclipse Milo versions 0.6.0 through 1.1.4, username-token processing returns distinguishable errors for invalid RSA PKCS#1 v1.5 padding and other authentication failures, allowing an on-path attacker who captures a victim's `Basic128Rsa15`-encrypted username token to use repeated unauthenticated `ActivateSession` requests as a padding oracle, recover the victim's password, and authenticate with the recovered credentials.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/eclipse-milo/milo/commit/db59fae993a3a1bc66fffc8a2796d444b40285fb Patch
- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/183 Issue Tracking, Patch, Vendor Advisory
- https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/598 Issue Tracking, Vendor Advisory
Vendor advisories in the News 1
- Eclipse Foundation Eclipse Milo CISA ICS Advisories · 2026-10-15
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
In the news 1
Change history 1
- First seenCVSS 9.1 · eclipseNVD modified 2026-10-23 23:10
Affected (CPE criteria) 1
cpe:2.3:a:eclipse:milo:*:*:*:*:*:*:*:*
References 3
- https://github.com/eclipse-milo/milo/commit/db59fae993a3a1bc66fffc8a2796d444b40285fb Patch
- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/183 Issue Tracking, Patch, Vendor Advisory
- https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/598 Issue Tracking, Vendor Advisory