7.9

CVE-2025-22153: try/except* clauses could allow bypass RestrictedPython via type confusion bug in the CPython interpreter

Deferred
AliasesGHSA-gmj9-h825-chq2PYSEC-2026-1874UBUNTU-CVE-2025-22153
Published 23-01-2025Last modified 12-02-2025

Vulnerability summary

CVE-2025-22153 is a high (CVSS 7.9) vulnerability in zopefoundation restrictedpython. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.9/10
010
High · v3.1 (CVE.org)
EPSS score
0.40%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
USN-7355-1

Timeline

  1. 23-01-2025
    PublishedVulnerability first disclosed.
  2. 12-02-2025
    Last modifiedVulnerability information updated.

Description

RestrictedPython is a tool that helps to define a subset of the Python language which allows to provide a program input into a trusted environment. Via a type confusion bug in versions of the CPython interpreter starting in 3.11 and prior to 3.13.2 when using `try/except*`, RestrictedPython starting in version 6.0 and prior to version 8.0 could be bypassed. The issue is patched in version 8.0 of RestrictedPython by removing support for `try/except*` clauses. No known workarounds are available.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.40% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • restrictedpython< 8.0-1
PyPI1 product
  • restrictedpython≥ 6.0, < 8.0
Ubuntu1 product
  • restrictedpython< 6.2-1ubuntu0.24.04.1~esm1
Zopefoundation1 product

4 vendors · 4 products

References

10 links