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CVE Record

CVE-2026-41603: Apache Thrift: Java TSSLTransportFactory hostname verification

Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift. This issue affects Apache Thrift: before 0.23.0. Users are recommended to upgrade to version 0.23.0, which fixes the issue.

HighCVSS 8.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Apache Thrift Java applications before version 0.23.0 may accept a TLS certificate issued for the wrong hostname. An attacker able to intercept network traffic could potentially impersonate a trusted service, exposing sensitive communications or enabling limited tampering. Apache recommends upgrading to 0.23.0.

Executive priority

Treat this as a high-priority confidentiality risk, especially for Thrift connections carrying credentials, customer data, or privileged service traffic. Establish exposure quickly and schedule upgrades promptly. Emergency handling is most justified where affected TLS connections cross untrusted networks; current sources do not establish widespread or active exploitation.

Technical view

CVE-2026-41603 affects Apache Thrift before 0.23.0 and concerns hostname verification in Java TSSLTransportFactory. The issue is classified under improper certificate and hostname validation. CVSS 3.1 scores it 8.2: network-reachable, low complexity, no privileges or user interaction, with high confidentiality and low integrity impact.

Likely exposure

Exposure is most likely where Java applications use affected Apache Thrift TLS transport to connect across networks and depend on certificate hostname verification. Version presence alone does not prove reachability; teams must confirm the library version, Java transport configuration, connection paths, and whether upstream TLS controls provide independent verification.

Exploitation context

The supplied record is not listed in KEV, and the cited material provides no evidence of active exploitation. Successful abuse would plausibly require an attacker to intercept or redirect traffic and present a certificate that passes other trust checks but does not match the intended hostname. Exact operational prerequisites are not fully documented here.

Researcher notes

The record identifies improper certificate hostname validation and the fixed release, but does not provide detailed code-path, configuration, or exploit-precondition evidence. CWE-295, CWE-297, and CWE-306 are listed. Assessment should distinguish certificate-chain trust from endpoint hostname verification and avoid treating every installed pre-0.23.0 package as demonstrably exploitable.

Mitigation direction

  • Upgrade Apache Thrift to version 0.23.0 or later.
  • Prioritize internet-facing and cross-trust-boundary Java Thrift connections.
  • Check applicable Red Hat advisories when using vendor-packaged components.
  • Apply temporary network-path protections if upgrading cannot occur promptly.
  • Review Apache guidance for any deployment-specific requirements.

Validation and detection

  • Inventory direct and transitive Apache Thrift versions in Java applications.
  • Identify uses of TSSLTransportFactory and map their remote endpoints.
  • Confirm deployed artifacts contain Apache Thrift 0.23.0 or later.
  • Test that certificates for mismatched hostnames are rejected.
  • Review dependency scans for embedded or vendor-packaged affected copies.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

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 lookup
cwe · low confidence lookup

CWE-297: 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 lookup
cwe · medium confidence lookup

CWE-306: Credential and account abuse lookup

Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookup
cve · low confidence lookup

CVE-2026-41603 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
8.2 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Official CVE source material

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.

2CVSS vectors
5Timeline events
3ADP providers
12Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
8.2CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N3.94.2redhat-SADP
7.4CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

8.2High
CVSS 3.1 vector shape for CVE-2026-41603Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPApache Thrift: apache.com/apache/thrift: Apache Thrift: Security Bypass via Improper Certificate Hostname Validation
other:Red Hat severity ratingcvssV3_1
  • 2026-04-28T10:01:29.782Z: Reported to Red Hat.
  • 2026-04-28T09:19:40.564Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Apache Software FoundationApache Thrift0unaffected
Weakness

CWE details

CWE-295CWE-297CWE-306

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-295 · source CWE mapping

Improper Certificate Validation

Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-297 · source CWE mapping

Improper Validation of Certificate with Host Mismatch

Improper Validation of Certificate with Host Mismatch represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-306 · source CWE mapping

Missing Authentication for Critical Function

Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs