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Δ / VULNERABILITY RECORD

CVE-2026-66858.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 8.7CVSS 4.0 · security@apache.org
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSDeferredModified Oct 02, 2026

Disclosure summary

The protocol skip routine in several Apache Thrift bindings did not apply the binding's recursion limit, so a message that nests unknown fields deeply enough can exhaust the stack. Affected: the Python C++ accelerator (the pure-Python protocols are not affected), the PHP library and its thrift_protocol extension, and the Perl, Lua, Smalltalk and OCaml libraries. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue.

Source-reported weakness categories

CWE-674

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2026-Oct

Open original source · Updated Oct 05, 2026

Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: skip() does not apply the recursion limit (Python accelerator, PHP, Perl, Lua, Smalltalk, OCaml)

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

VendorProduct / associationVersion / bounds
Microsoft update guideazl3 thrift 0.24.0-1 on Azure Linux 3.0 (MSRC status code 3)

Vendor remediation references

NIST National Vulnerability Database · NVD-CVE-2026-66858

Open original source · Updated Oct 02, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

Original records & references

PUBLISHED 2026-10-02T09:17:53-04:00
MODIFIED 2026-10-02T13:17:07-04:00
INGESTED 2026-10-06T11:45:30-04:00