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CVE-2026-43871: Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: TCompactProtocol varint byte-count limit

highCVSS 7.5CVE-2026-43871

CSIRTS triage

vendor: Apacheproduct: ThriftDenial of service
What
TCompactProtocol does not enforce a byte-count limit on varint decoding, allowing denial of service via malformed messages.
Who is affected
Applications using Apache Thrift with TCompactProtocol for deserialization.
Urgency
High priority; network-accessible protocol with easy exploitation potential for denial of service.
Action
Update Apache Thrift to patched version implementing varint byte-count limits.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43871

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-43871coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Apache Thrift

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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