CVE-2026-41608: Apache Thrift: Unbounded Zlib Decompression in Python THeaderTransport

highCVSS 7.5CVE-2026-41608

CSIRTS triage

vendor: Apache product: Thrift Denial of service

What: Unbounded Zlib decompression in Python THeaderTransport allows memory exhaustion attack.
Who is affected: Python applications using Apache Thrift THeaderTransport.
Urgency: High priority; CVSS 7.5 and denial of service impact.
Action: Apply Apache Thrift patch or upgrade to patched Python version.

AI-assisted analysis generated from the source advisory — verify against the original.

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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-2026-41608

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.

Moderate exploitation riskCVE-2026-416081.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 62% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-41608	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-41608: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Apache Thrif…nvd

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.

mediumCVE-2026-55970: Apache Thrift: C++ heap out-of-bounds read in THeaderTransport::readHeaderFormat()msrc · 2026-08-06
criticalCVE-2026-58662: Apache Thrift: C++ THeaderTransport::readString() info-header length bounds bypassmsrc · 2026-08-06
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criticalCVE-2026-58023: Apache Thrift: c_glib heap out-of-bounds read in transport leftover-bytes pathmsrc · 2026-08-06
highCVE-2026-43871: Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: TCompactProtocol varint byte-count…msrc · 2026-08-06