User ID collisions via truncated MD5 hashing
Published Jun 28, 2026 · Updated Jun 28, 2026
Weak hashing in SkyPilot 0.1 through 0.12.0 allows remote attackers to cause API-server user-ID collisions via crafted usernames. The user creation and import handlers in sky/users/server.py derive each user ID by truncating an MD5 digest of username.encode() instead of using a collision-resistant identifier. The CNA rates exploitation as high complexity but does not disclose how a collision is reached or which authorization or resource decision is affected.
Summary
What happened
Weak hashing in SkyPilot 0.1 through 0.12.0 allows remote attackers to cause API-server user-ID collisions via crafted usernames. The user creation and import handlers in sky/users/server.py derive each user ID by truncating an MD5 digest of username.encode() instead of using a collision-resistant identifier. The CNA rates exploitation as high complexity but does not disclose how a collision is reached or which authorization or resource decision is affected.
The record
- CVE
- CVE-2026-13482
- Published
- Jun 28, 2026
- Updated
- Jun 28, 2026
- Vendor
- SkyPilot
- Product
- SkyPilot
- Classifications
- CWE-327, CWE-328
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 28, 2026CVE publishedPublication date reported by the CVE source.
- Jun 28, 2026Record 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.
- Affected versionversion=0.1
- Affected versionversion=0.10
- Affected versionversion=0.11
- Affected versionversion=0.12.0
- Affected versionversion=0.2
- Affected versionversion=0.3
- Affected versionversion=0.4
- Affected versionversion=0.5
- Affected versionversion=0.6
- Affected versionversion=0.7
- Affected versionversion=0.8
- Affected versionversion=0.9
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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