CVE-2026-11751Network attack vector

Man-in-the-middle via disabled xDS TLS verification

Published Aug 19, 2026 · Updated Aug 20, 2026

Improper certificate validation in LY Corporation Armeria armeria-xds before 1.41.0 allows remote attackers to intercept upstream traffic. In xds/src/main/java/com/linecorp/armeria/xds/TransportSocketSnapshot.java, CommonTlsContext handling installs TlsPeerVerifierFactory.noVerify() when validation_context is missing or lacks both trusted_ca and system_root_certs, and it also clears endpointIdentificationAlgorithm so hostname checks do not run. Reachability requires control of the network path or influence over xDS control-plane resources, after which affected clients accept arbitrary certificates on xDS-managed upstream TLS connections.

CVSS severity9.1
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in LY Corporation Armeria armeria-xds before 1.41.0 allows remote attackers to intercept upstream traffic. In xds/src/main/java/com/linecorp/armeria/xds/TransportSocketSnapshot.java, CommonTlsContext handling installs TlsPeerVerifierFactory.noVerify() when validation_context is missing or lacks both trusted_ca and system_root_certs, and it also clears endpointIdentificationAlgorithm so hostname checks do not run. Reachability requires control of the network path or influence over xDS control-plane resources, after which affected clients accept arbitrary certificates on xDS-managed upstream TLS connections.

The record

CVE
CVE-2026-11751
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
LY Corporation
Product
Armeria
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LY Corporation · ArmeriaAffected versions are unavailable in this record.

Published CVSS scores

9.1LINE CorporationCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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