Critical severity · published Jul 27, 2026
CVE-2026-55971
Apache Thrift: C++ ZLIB heap buffer overflow (write) in THeaderTransport::untransform()
9.8
CVSS
1%
EPSS
No
On KEV
Description
Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings.
This issue affects Apache Thrift: before 0.24.0.
Users are recommended to upgrade to version 0.24.0, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AT
Apache Thrift · Apache Software Foundation
before 0.24.0 · source: vendor
TH
Thrift · Apache
before 0.24.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55971
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55971
Release Notes
https://lists.apache.org/thread/7v3jhgwfbmhx42424phydlnzb109g8b9
Vendor Advisory
https://lists.apache.org/thread/xjs36m6kjxpmrmzwck636msg3nvoqnmx
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/24/42
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