Security readout for executives and security teams
Plain-English summary
A flaw in armeria-xds can silently stop checking the identity of upstream TLS peers. An attacker positioned to intercept affected xDS-managed connections could impersonate upstream services and read or alter sensitive traffic without normal certificate warnings.
Executive priority
Treat affected production deployments as an urgent remediation item, especially where upstream traffic carries credentials, confidential data, or control-plane information. Prioritize internet-facing or less-trusted network paths, while confirming applicability and the vendor-approved fixed version.
Technical view
CVE-2026-11751 is a CWE-295 certificate-validation failure affecting xDS upstream TLS peer verification. The description identifies armeria-xds versions before 1.41.0, but the supplied affected-version metadata marks 1.41.0 as affected. CVSS 4.0 rates it 9.1, with network reachability, high complexity, and an attack prerequisite.
Likely exposure
Exposure is most likely where armeria-xds manages upstream TLS connections and the deployed version is vulnerable. Risk depends on an attacker gaining a position capable of intercepting that network path. Deployments not using this xDS-managed upstream TLS functionality may not be exposed.
Exploitation context
The bundle describes man-in-the-middle impact but provides no evidence of active exploitation. The CVE is not listed as KEV. CVSS indicates no privileges or user interaction, although exploitation has high complexity and requires an additional attack condition.
Researcher notes
The central issue is silent TLS peer-verification disablement, mapped to CWE-295. Confidentiality and integrity impacts are high; availability impact is not claimed. Version evidence is internally inconsistent: narrative text says versions before 1.41.0, while structured metadata marks 1.41.0 affected. Confirm against the linked vendor advisory.
Mitigation direction
- Inventory armeria-xds deployments and identify systems using xDS-managed upstream TLS connections.
- Consult the vendor advisory to resolve the conflicting affected-version metadata before upgrading.
- Update to the vendor-confirmed fixed release using normal change-control procedures.
- Restrict and monitor network paths carrying xDS-managed upstream TLS traffic until remediation is verified.
Validation and detection
- Check dependency manifests, lockfiles, and SBOMs for the deployed armeria-xds version.
- Confirm whether each identified deployment uses xDS-managed upstream TLS connections.
- Verify in a controlled environment that untrusted upstream certificates are rejected.
- Review monitoring data for unexpected certificates, peer identities, or interception indicators.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-295: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-11751 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N——LY-CorporationVulnerability scoring details
Base CVSS 4.0 score
9.1CriticalVector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://line.github.io/security-advisory-blog/CVE-2026-11751/CVE reference, LY-Corporation
- https://github.com/line/armeria/security/advisories/GHSA-6qfw-3mvj-m6v5CVE reference, LY-Corporation
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.