CVE-2026-91135Network attack vectorHinoki check available

Heap corruption via unchecked compressed-frame copy

Published Oct 2, 2026 · Updated Oct 2, 2026

Heap buffer overflow in Apache Thrift C++ before 0.25.0 allows remote attackers to corrupt heap memory via outgoing ZLIB frames. THeaderTransport::transform() copies the compressed frame from its transform buffer into the write buffer without checking whether it fits after compression enlarges the data. Exposure requires an application to enable the ZLIB write transform and send attacker-influenced, poorly compressible content; the resulting overwrite corrupts process memory.

CVSS severityUnavailable
Unscored
EPSS probability0.46%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap buffer overflow in Apache Thrift C++ before 0.25.0 allows remote attackers to corrupt heap memory via outgoing ZLIB frames. THeaderTransport::transform() copies the compressed frame from its transform buffer into the write buffer without checking whether it fits after compression enlarges the data. Exposure requires an application to enable the ZLIB write transform and send attacker-influenced, poorly compressible content; the resulting overwrite corrupts process memory.

The record

CVE
CVE-2026-91135
Published
Oct 2, 2026
Updated
Oct 2, 2026
Vendor
The Apache Software Foundation
Product
Apache Thrift
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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 <0.25.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Apache Software Foundation · Apache Thriftversion=0 <0.25.0

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

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