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CVE-2026-55969: Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: integer overflow in TProtocol::checkReadBytesAvailable()

highCVSS 7.5CVE-2026-55969

CSIRTS triage

vendor: Apacheproduct: ThriftMemory corruptionCode injection
What
An integer overflow in TProtocol::checkReadBytesAvailable() allows reading arbitrary amounts of memory or causing memory exhaustion.
Who is affected
Applications using vulnerable versions of Apache Thrift for serialization and RPC.
Urgency
High; CVSS 7.5 indicates significant risk of remote code execution or denial-of-service.
Action
Upgrade Apache Thrift to a version with integer overflow bounds checking in TProtocol.

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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-2026-55969

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-2026-55969coverage & 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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