CVE-2026-43868 is a medium-severity (CVSS 5.3) CWE-789 vulnerability in thrift. A fix is available for thrift — see the affected versions and patch details below.
Apache Thrift: Rust implementation vulnerable to CVE-2020-13949 pattern
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-43868.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
thriftReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
Description
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | thrift | all versions | 0.23.0cargo update -p thrift --precise 0.23.0 |
Affected Products
thriftapacheDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for thrift, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update thrift to 0.23.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-43868 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This is an Important denial of service flaw in Apache Thrift, allowing an unauthenticated remote attacker to exhaust system resources. By sending specially crafted requests with excessive size values, an attacker can cause memory allocation failures, leading to system unresponsiveness. This poses a significant risk to…
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.Source: Red Hat security advisory for CVE-2026-43868 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Build of Apache Camel 3.33.2.SP1 | org.apache.thrift/libthrift:0.23.0 | RHSA-2026:26586 |
| Red Hat OpenShift AI 2.25 | rhoai/odh-modelmesh-rhel9:1783443816 | RHSA-2026:42644 |
Frequently Asked Questions
Is CVE-2026-43868 in your dependencies?
Find it across crates.io, including transitive dependencies.