CVE-2026-55971: Apache Thrift: C++ ZLIB heap buffer overflow (write) in THeaderTransport::untransform()

Overview

Severity

Critical (CVSS 9.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-08-07

EPSS Score

1.04% (percentile: 60.8%)

Affected Products (1)

Other

• 21398-17084

Revision History

• 2026-08-07: Information published.