CVE-2026-43870 is a high-severity (CVSS 7.3) Path Traversal vulnerability in thrift. No vendor fix is recorded yet; mitigation options are listed below.
Apache Thrift: Node.js web_server.js multi-vulnerability
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-2026-43870.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2026-43870 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
thriftnpmDescription
Origin Validation Error, Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting'), Uncontrolled Resource Consumption 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 |
|---|---|---|---|
| 📦npm | thrift | all versions | No fix |
Detection & 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.
Remediation status
No patched version of thrift has shipped for CVE-2026-43870 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-43870 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-43870. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
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 Important flaw in Apache Thrift allows a remote attacker to trigger a denial of service through uncontrolled resource consumption. Additionally, the vulnerability enables path traversal for unauthorized file access and HTTP request/response splitting, potentially leading to further web-based attacks in Red Hat…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 10.0 Extended Update Support | opentelemetry-collector-0:0.152.1-1.el10_0 | RHSA-2026:53413 |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | opentelemetry-collector-0:0.152.1-1.el9_4 | RHSA-2026:53412 |
| Red Hat Enterprise Linux 9.6 Extended Update Support | opentelemetry-collector-0:0.152.1-1.el9_6 | RHSA-2026:53415 |
| Multicluster Global Hub 1.4.9 | multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1784060681 | RHSA-2026:41030 |
| Multicluster Global Hub 1.6.5 | multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1784561376 | RHSA-2026:44622 |
| Multicluster Global Hub 1.7.3 | multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1784906628 | RHSA-2026:47149 |
| Multicluster Global Hub 1.7.3 | multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1785442872 | RHSA-2026:53530 |
| Red Hat Advanced Cluster Management for Kubernetes 2.13 | rhacm2/acm-grafana-rhel9:1787644958 | RHSA-2026:60390 |
Frequently Asked Questions
Is CVE-2026-43870 in your dependencies?
O3 Security finds CVE-2026-43870 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.