Integer Overflow or Wraparound Affecting thrift package, versions [0,]
Threat Intelligence
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Start learning- Snyk IDSNYK-CONAN-THRIFT-18389066
- published29 Jul 2026
- disclosed27 Jul 2026
- creditJavid Khan, Ghaith Abdulreda
Introduced: 27 Jul 2026
NewCVE-2026-55969 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the zlib transport message-size tracking. An attacker can bypass the configured maxMessageSize/remainingmessagesize limits by sending a highly compressible message and forcing repeated decompressed reads, so the transports fail to decrement the consumed-message byte count correctly. This allows oversized messages to be accepted rather than rejected, breaking message-size enforcement in applications that rely on these transports to enforce input limits.
Notes
- In the C++ binding, the vulnerable path is the
TZlibTransportread loop used with a configuredTConfigurationmessage-size cap; the undercount only shows up when the same compressed message is decompressed across repeatedread()calls, so streams that fit in one call are less likely to expose it. - In the c_glib binding, the issue is tied to the transport’s
remainingmessagesizeaccounting onThriftZlibTransport; deployments that never set that per-transport limit are outside the affected enforcement path.