CVE-2026-48586Network attack vector

Service interruption via unbounded TZlibTransport decompression

Published Jul 27, 2026 · Updated Jul 27, 2026

Improper handling of compressed data in Apache Thrift before 0.24.0 allows remote attackers to interrupt RPC services. TZlibTransport in the C++, Java, Python, Go, D, and C/GLib bindings expands attacker-controlled zlib data without enforcing a decompressed-size limit. An unauthenticated network peer can exhaust CPU or memory only when a client or server exposes a zlib-enabled Thrift transport.

CVSS severity8.7
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper handling of compressed data in Apache Thrift before 0.24.0 allows remote attackers to interrupt RPC services. TZlibTransport in the C++, Java, Python, Go, D, and C/GLib bindings expands attacker-controlled zlib data without enforcing a decompressed-size limit. An unauthenticated network peer can exhaust CPU or memory only when a client or server exposes a zlib-enabled Thrift transport.

The record

CVE
CVE-2026-48586
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
The Apache Software Foundation
Product
Apache Thrift
Classifications
CWE-409, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Thriftversion=0 <0.24.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Apache Software FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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