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CVE Record

CVE-2026-43869: Apache Thrift: TSSLTransportFactory.java 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 7.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Apache Thrift before 0.23.0 could incorrectly accept a TLS certificate whose hostname does not match the server. That weakens the trust check applications rely on for encrypted connections and can expose data or service integrity if traffic is intercepted or redirected.

Executive priority

Treat as high priority for services using Apache Thrift over TLS, especially where traffic crosses untrusted networks. The fix path is clear: upgrade to 0.23.0 or vendor-provided patched packages.

Technical view

The issue is improper certificate validation with host mismatch in Apache Thrift TSSLTransportFactory.java. It is classified as CWE-295 and CWE-297, affects Apache Thrift before 0.23.0, and has CVSS 3.1 score 7.3 with network attack vector and low confidentiality, integrity, and availability impact.

Likely exposure

Exposure is most likely in Java applications or services using Apache Thrift TLS transports with versions before 0.23.0. Downstream packaged products may also be affected, as indicated by multiple Red Hat advisories, but product-specific impact must be confirmed against vendor notices.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. The practical risk is TLS endpoint impersonation where hostname validation matters. No public exploit steps or weaponized guidance are included in the provided sources.

Researcher notes

Evidence is strongest for version scope and remediation, but limited on root-cause detail and downstream package impact. Do not assume exploitation or affected products beyond Apache Thrift before 0.23.0 and vendor advisories listed in the source bundle.

Mitigation direction

  • Upgrade Apache Thrift to version 0.23.0 or later.
  • Review Red Hat advisories for affected packaged dependencies.
  • Prioritize internet-facing or cross-network Thrift clients using TLS.
  • Check vendor guidance before applying product-specific fixes.
  • Monitor Apache and distribution advisories for follow-up changes.

Validation and detection

  • Inventory applications and SBOMs for Apache Thrift versions before 0.23.0.
  • Identify Java code paths using TSSLTransportFactory or Thrift TLS transports.
  • Confirm deployed artifacts include Apache Thrift 0.23.0 or later.
  • Map Red Hat package advisories to installed products and versions.
  • Review TLS integration tests for hostname mismatch rejection behavior.
Prepared
Confidence
medium
Sources
10

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
cve · low confidence lookup

CVE-2026-43869 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
7.3 (3.1)
Known Exploited
No
Published

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

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
17Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical 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
7.3CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L3.93.4CISA-ADP
7.3CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L3.93.4redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.3High
CVSS 3.1 vector shape for CVE-2026-43869Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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 Thrift: Security bypass due to improper certificate validation
other:Red Hat severity ratingcvssV3_1
  • 2026-05-05T08:00:56.417Z: Reported to Red Hat.
  • 2026-05-05T07:25:48.611Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Apache Software FoundationApache Thrift0unaffected
Weakness

CWE details

CWE-295CWE-297

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