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CVE Record

CVE-2026-43868: Apache Thrift: Rust implementation vulnerable to CVE-2020-13949 pattern

Memory Allocation with Excessive Size Value 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 7.5Not 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 has a high-severity flaw in its Rust implementation that can make a service allocate excessive memory. The main business risk is denial of service: an affected service could become unavailable if it processes hostile or malformed input.

Executive priority

Prioritize remediation for internet-facing or business-critical services using Apache Thrift Rust before 0.23.0. Treat as high urgency for availability-sensitive environments, but not as a confirmed exploited issue based on the provided sources.

Technical view

The CVE describes a Memory Allocation with Excessive Size Value issue in Apache Thrift, aligned to CWE-1285 and CWE-789. CVSS 3.1 is 7.5 with network, low-complexity, unauthenticated exploitation characteristics and availability-only impact. Apache recommends upgrading to 0.23.0.

Likely exposure

Exposure is likely where Apache Thrift Rust components before 0.23.0 process untrusted or network-originated data. Confirm direct and transitive dependency use, including vendor-packaged versions referenced by Red Hat advisories.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates unauthenticated network reachability and low attack complexity, with the expected outcome limited to availability impact.

Researcher notes

The record ties this Rust issue to the CVE-2020-13949 pattern but only identifies Apache Thrift before 0.23.0 as affected. The provided data does not include exploit proof, vulnerable code paths, or product-specific impact beyond Apache and Red Hat references.

Mitigation direction

  • Upgrade Apache Thrift to version 0.23.0 or later.
  • Apply applicable Red Hat security advisories where Thrift is vendor-packaged.
  • Inventory services using Apache Thrift Rust libraries before 0.23.0.
  • Restrict untrusted network access to affected services until updated.
  • Monitor affected services for abnormal memory growth or restarts.

Validation and detection

  • Check dependency manifests and lockfiles for Apache Thrift versions below 0.23.0.
  • Confirm whether any Rust Thrift service accepts untrusted network input.
  • Verify deployed artifacts use upgraded or vendor-fixed packages.
  • Review Red Hat CSAF, CVE, and errata records for packaged exposure.
  • Confirm monitoring covers memory exhaustion and service availability symptoms.
Prepared
Confidence
high
Sources
8

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-1285: 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-789: 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.

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cve · low confidence lookup

CVE-2026-43868 mapping review

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

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

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
2ADP providers
7Source 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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADP
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-43868Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPApache Thrift: Apache Thrift: Denial of Service via excessive memory allocation
other:Red Hat severity ratingcvssV3_1
  • 2026-05-05T09:00:59.745Z: Reported to Red Hat.
  • 2026-05-05T07:49:47.754Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Apache Software FoundationApache Thrift0unaffected
Weakness

CWE details

CWE-1285CWE-789

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

CWE-1285 · source CWE mapping

Improper Validation of Specified Index, Position, or Offset in Input

Improper Validation of Specified Index, Position, or Offset in Input represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-789 · source CWE mapping

Memory Allocation with Excessive Size Value

Memory Allocation with Excessive Size Value represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs