---
id: CVE-2026-43871
title: 'thrift: Apache Thrift: Denial of Service via infinite loop (CVE-2026-43871)'
summary: >-
  A flaw was found in Apache Thrift, affecting its Python, Go, PHP, and Java
  components. This vulnerability, known as an 'Infinite Loop', could allow a
  remote attacker to disrupt service availability. By exploiting this flaw, an
  attacker can…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-835
vendor: Red Hat
product: Red Hat Hardened Images
affected:
  - enterprise_linux_ai_rhel_ai 3
  - openshift_update_service
  - hardened_images
patched:
  - hardened_images
published: '2026-07-27'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T16:35:41+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43871.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43871.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-43871'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507441'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-43871'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-43871'
  - url: 'http://www.openwall.com/lists/oss-security/2026/07/24/33'
  - url: 'https://lists.apache.org/thread/7v3jhgwfbmhx42424phydlnzb109g8b9'
  - url: 'https://lists.apache.org/thread/l4dwf14zbyqsmkc28c99ojj3t3gg9qby'
  - url: 'https://access.redhat.com/errata/RHSA-2026:49837'
  - url: 'https://github.com/apache/thrift'
  - url: 'https://pypi.org/project/thrift'
  - url: 'https://github.com/advisories/GHSA-8wv5-x4w7-5gww'
tags:
  - csaf
  - vex
  - red-hat
  - osv
  - pip
epss: 0.00607
epssPercentile: 0.47712
aliases:
  - GHSA-8wv5-x4w7-5gww
  - BIT-thrift-2026-43871
  - PYSEC-2026-3926
ecosystem: pip
ingestedAt: '2026-09-02T19:31:22.961Z'
---

## Overview

A flaw was found in Apache Thrift, affecting its Python, Go, PHP, and Java components. This vulnerability, known as an 'Infinite Loop', could allow a remote attacker to disrupt service availability. By exploiting this flaw, an attacker can trigger a continuous loop, leading to a denial of service (DoS) for applications using the affected bindings.

## Vendor advisories

- **RHSA-2026:49837** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:49837)
- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift Update Service · no fix planned: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift Update Service · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43871.json)

**thrift: Apache Thrift: Denial of Service via infinite loop** — rated Important by Red Hat. Released 2026-07-27, updated 2026-09-21.

Affected:

- Red Hat Enterprise Linux AI (RHEL AI) 3
- Red Hat OpenShift Update Service

Fixed:

- Red Hat Hardened Images

No fix planned:

- Red Hat Enterprise Linux AI (RHEL AI) 3
- Red Hat OpenShift Update Service

Not affected:

- Confidential Compute Attestation
- Red Hat OpenShift Container Platform 4

## Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:49837

## Package advisory (CVE-2026-43871)

Affected packages:

- `thrift < 0.24.0`
- `github.com/apache/thrift < 0.24.0`
- `apache/thrift < 0.24.0`
- `org.apache.thrift:libthrift < 0.24.0`

Patched in:

- `thrift 0.24.0`
- `github.com/apache/thrift 0.24.0`
- `apache/thrift 0.24.0`
- `org.apache.thrift:libthrift 0.24.0`

Source: https://osv.dev/vulnerability/GHSA-8wv5-x4w7-5gww