CVE-2022-0529Public exploit

Process crash via unchecked Unicode filename escape append

Published Feb 9, 2022 · Updated Feb 13, 2025

Heap out-of-bounds write in Info-ZIP UnZip 6.0 allows context-dependent attackers to crash the process via a crafted ZIP archive. The wide_to_local_string function in process.c allocates a heap buffer from the wide-character count, then appends an escaped Unicode filename with strcat without checking the buffer's remaining capacity. A user must process the archive locally; the demonstrated overwrite corrupts heap metadata and crashes UnZip, and published advisories also identify arbitrary code execution.

CVSS severity5.5
Medium
EPSS probability2.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds write in Info-ZIP UnZip 6.0 allows context-dependent attackers to crash the process via a crafted ZIP archive. The wide_to_local_string function in process.c allocates a heap buffer from the wide-character count, then appends an escaped Unicode filename with strcat without checking the buffer's remaining capacity. A user must process the archive locally; the demonstrated overwrite corrupts heap metadata and crashes UnZip, and published advisories also identify arbitrary code execution.

The record

CVE
CVE-2022-0529
Published
Feb 9, 2022
Updated
Feb 13, 2025
Vendor
Info-ZIP
Product
UnZip
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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=6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Info-ZIP · UnZipversion=6.0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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