8.7

CVE-2026-66858: apache software foundation apache thrift Uncontrolled Recursion

CVSS: 8.7v4.0HighDeferred
AliasesUBUNTU-CVE-2026-66858DEBIAN-CVE-2026-66858
Published 02-10-2026Last modified 02-10-2026
Open JSON

Vulnerability summary

CVE-2026-66858 is a high (CVSS 8.7) Uncontrolled Recursion vulnerability in apache software foundation apache thrift. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.8% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.26%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:74369

Timeline

  1. 02-10-2026
    PublishedVulnerability first disclosed.
  2. 02-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

03-10-202618-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu3 products
  • php-horde-thriftAll versions (No fix recorded)
  • python-thriftAll versions (No fix recorded)
  • thriftAll versions (No fix recorded)
Apache software foundation1 product
Debian1 product
  • thriftAll versions (No fix recorded)

3 vendors · 5 products

References

5 links