CVE-2025-54368

Package-content substitution via inconsistent ZIP parsing

Published Aug 8, 2025 · Updated Aug 8, 2025

Interpretation conflict in Astral uv 0.8.5 and earlier allows attackers to substitute malicious package contents through crafted ZIPs. The streaming extractor trusted local file entries without reconciling them with the central directory, accepting duplicates or stacked ZIP contents. A user must install an attacker-controlled package; source ZIPs can execute code during a build, while wheels require a later invocation such as importing the package.

CVSS severity6.8
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Interpretation conflict in Astral uv 0.8.5 and earlier allows attackers to substitute malicious package contents through crafted ZIPs. The streaming extractor trusted local file entries without reconciling them with the central directory, accepting duplicates or stacked ZIP contents. A user must install an attacker-controlled package; source ZIPs can execute code during a build, while wheels require a later invocation such as importing the package.

The record

CVE
CVE-2025-54368
Published
Aug 8, 2025
Updated
Aug 8, 2025
Vendor
Astral
Product
uv
Classifications
CWE-20, CWE-436, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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=< 0.8.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Astral · uvversion=< 0.8.6

Published CVSS scores

6.8GitHubCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-436Interpretation Conflict
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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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