LiveActive security incident?Get immediate response
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
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Apache Thrift versions before 0.23.0 may accept a TLS certificate issued for the wrong hostname. This weakens assurance that software is communicating with the intended server, potentially enabling interception or manipulation by an attacker positioned on the network.

Executive priority

Treat this as a high-priority upgrade for exposed or sensitive Thrift communications. Establish ownership and patch timing promptly, while avoiding claims of an active incident without additional evidence.

Technical view

TSSLTransportFactory.java improperly validates certificate hostname matching, classified as CWE-295 and CWE-297. The network-reachable flaw requires no privileges or user interaction. Its CVSS 3.1 score is 7.3, with potential low-impact compromise of confidentiality, integrity, and availability.

Likely exposure

Potential exposure exists where Apache Thrift before 0.23.0 uses the affected Java TLS transport for connections requiring server identity verification. The bundle does not establish which applications, configurations, or Red Hat packages are vulnerable.

Exploitation context

No supplied source reports active exploitation, and the CVE is not identified as KEV. Exploitation would require a suitable network position and certificate conditions, but the provided evidence does not document practical attack prerequisites or public exploit availability.

Researcher notes

The description defines affected releases as versions before 0.23.0, although the structured affected entry lists only version "0" with a default unaffected status. Use the explicit description and vendor advisory while confirming product-specific applicability. Numerous Red Hat errata are referenced, but their affected-package details are absent from the bundle.

Mitigation direction

  • Upgrade Apache Thrift to version 0.23.0 or later.
  • Prioritize internet-facing and untrusted-network Thrift connections.
  • Review Apache and relevant operating-system vendor advisories for packaged updates.
  • Use trusted network paths until affected deployments are upgraded.

Validation and detection

  • Inventory Apache Thrift versions across applications and dependencies.
  • Identify Java services using TSSLTransportFactory for TLS connections.
  • Confirm deployed versions report 0.23.0 or later.
  • Verify hostname mismatches are rejected in an authorized test environment.
  • Review vendor errata applicable to installed Red Hat packages.
Prepared
Confidence
high
Sources
6

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
18Source 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.

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