CVE-2023-39137Public exploit

Filename spoofing via conflicting ZIP header names

Published Aug 30, 2023 · Updated Oct 1, 2024

Improper input validation in Archive 3.3.7 and earlier allows attackers to spoof a ZIP entry's filename during extraction. The ZipFile extraction path trusts the local file header filename without reconciling it with the central directory filename, so a crafted archive appears to contain one name but writes another. Processing an attacker-supplied ZIP is required; the demonstrated consequence is filename and file-type misrepresentation before versus after extraction.

CVSS severity7.8
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Archive 3.3.7 and earlier allows attackers to spoof a ZIP entry's filename during extraction. The ZipFile extraction path trusts the local file header filename without reconciling it with the central directory filename, so a crafted archive appears to contain one name but writes another. Processing an attacker-supplied ZIP is required; the demonstrated consequence is filename and file-type misrepresentation before versus after extraction.

The record

CVE
CVE-2023-39137
Published
Aug 30, 2023
Updated
Oct 1, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8GitHub Advisory DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/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 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-20Improper Input Validation
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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