CVE-2026-118489
CachingWebClient shares user-specific HTTP responses across users via the shared cache tier
No exploitation reported by the sources we read.
- Published2026-11-03
- WeaknessCWE-200 · CWE-524
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
In Eclipse Vert.x versions [4.0.0,4.5.35] or [5.0.0,5.2.2], when one `CachingWebClient` is shared across users — the documented pattern of a per-user `WebClientSession` over a shared caching client — a response that is specific to one user but is cacheable and not marked `private`/`no-store` is stored in the client-level shared cache tier and served to other users requesting the same URL. A later user's session, or an anonymous caller through the same client, can receive an earlier user's response. Depending on the response this discloses authenticated content or a session cookie, the latter enabling session fixation or hijacking.
Timeline
dates in UTC- 2026-11-0314:55CVE publishedCNA
Observed activity
isMalicious corpus · updated 2026-11-03 09:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-118489?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-118489?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
Products declared by the CNA
As eclipse, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.
- Eclipse Foundation Eclipse Vert.xother versions: not affectedAffected
- ≥ 4.0.0, ≤ 4.5.35no fix statedsemver
- ≥ 5.0.0, ≤ 5.2.2no fix statedsemver
Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-03
Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-118489 yet.
Fix
No fix published by the sources we read yet. NVD record
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
- Metasploit modules
- none listed Metasploit Framework
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- 2026-11-03
- Last Modified
- 2026-11-03
- NVD status
- Received
Frequently asked questions
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