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CVE-2026-49158: Apache Thrift: Ruby THeaderTransport ZLIB Decompression Bomb

highCVSS 7.5CVE-2026-49158

CSIRTS triage

vendor: Apacheproduct: ThriftDenial of service
What
Ruby THeaderTransport ZLIB decompression does not limit decompression ratio, allowing decompression bombs to consume excessive memory.
Who is affected
Applications using Apache Thrift Ruby bindings with THeaderTransport and untrusted compressed input.
Urgency
High; CVSS 7.5 and straightforward denial of service via malicious compressed payloads.
Action
Upgrade Apache Thrift to patched version or implement decompression ratio limits in application code.

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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-2026-49158

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-2026-49158coverage & 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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