CVE-2021-32495Public exploit

Process crash via aliased pyc object free

Published Jul 7, 2023 · Updated Nov 12, 2024

Use-after-free in the pyc parser in radareorg radare2 5.3.0-git 26142 allows attackers to crash the process via a crafted .pyc file. In get_object, ref_idx data is freed even when it aliases the object returned by get_none_object, after which copy_object reads the freed allocation. Affected files must be opened by radare2 or inspected by rabin2; the demonstrated consequence is process abort, while the CVE record also reports freed-memory disclosure.

CVSS severity9.1
Critical
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the pyc parser in radareorg radare2 5.3.0-git 26142 allows attackers to crash the process via a crafted .pyc file. In get_object, ref_idx data is freed even when it aliases the object returned by get_none_object, after which copy_object reads the freed allocation. Affected files must be opened by radare2 or inspected by rabin2; the demonstrated consequence is process abort, while the CVE record also reports freed-memory disclosure.

The record

CVE
CVE-2021-32495
Published
Jul 7, 2023
Updated
Nov 12, 2024
Vendor
radareorg
Product
radare2
Classifications
CWE-416, T1204.002
Attack vector
Unavailable
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 2024Record 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=radare2 5.3.0-git 26142

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesunauthenticated

What is affected?

radareorg · radare2version=radare2 5.3.0-git 26142

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
10.0Fedora ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1204.002Malicious File

Public exploit references

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

Technologies

Your stack

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Your stack

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