CVE-2026-66837Network attack vectorHinoki check available

PHP service crash via wire-sized stack buffer

Published Oct 2, 2026 · Updated Oct 2, 2026

Stack-based buffer overflow in Apache Thrift PHP bindings before 0.25.0 allows remote attackers to crash a PHP service via crafted strings. The native binary_deserialize path allocates a stack array using the wire-supplied 32-bit string length plus one, then reads the declared number of bytes into it without bounding the stack allocation. Exposure requires parsing untrusted Thrift messages through the optional PHP protocol extension; code execution has not been established.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Stack-based buffer overflow in Apache Thrift PHP bindings before 0.25.0 allows remote attackers to crash a PHP service via crafted strings. The native binary_deserialize path allocates a stack array using the wire-supplied 32-bit string length plus one, then reads the declared number of bytes into it without bounding the stack allocation. Exposure requires parsing untrusted Thrift messages through the optional PHP protocol extension; code execution has not been established.

The record

CVE
CVE-2026-66837
Published
Oct 2, 2026
Updated
Oct 2, 2026
Vendor
Apache Software Foundation
Product
Apache Thrift
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesunauthenticated

What is affected?

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started