Vulnerability · Published Oct 2, 2026 · Assigned by apache

CVE-2026-94636Apache Thrift: Python `TZlibTransport` stops enforcing its decompressed-size limit once the limit is exactly used up

High 8.2

In plain English

A high-severity security flaw in Apache Thrift from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.3%top 79.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Improper handling of highly compressed data (data amplification), Function call with incorrectly specified arguments, Improper validation of specified quantity in input vulnerability in Apache Thrift py bindings. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	thrift	no fix listed	DEBIAN-CVE-2026-94636
Debian:13	thrift	no fix listed	DEBIAN-CVE-2026-94636
Debian:14	thrift	no fix listed	DEBIAN-CVE-2026-94636
Ubuntu:22.04:LTS	thrift	no fix listed	UBUNTU-CVE-2026-94636
Ubuntu:24.04:LTS	thrift	no fix listed	UBUNTU-CVE-2026-94636
Ubuntu:26.04:LTS	thrift	no fix listed	UBUNTU-CVE-2026-94636
Ubuntu:26.10	thrift	no fix listed	UBUNTU-CVE-2026-94636

Affected products (as reported)

Vendor	Product	Versions
Apache Software Foundation	Apache Thrift	0 – before 0.25.0

Weakness: CWE-409, CWE-628, CWE-1284 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1 vendor-advisory
https://lists.apache.org/thread/1rpq0d0g6yzjjzl1z27lwmvhzkn6rbrs vendor-advisory