Malicious file substitution via MD5 collisions
Published Sep 17, 2025 · Updated Sep 17, 2025
Weak integrity checks in dragonflyoss Dragonfly before 2.1.0 allow remote attackers to substitute malicious downloaded files via MD5 collisions. DragonFly2 hashes each piece with MD5, concatenates those digests into PieceMd5Sign, and accepts different pieces when their MD5 values collide. Exploitation requires participation as a peer and crafted benign and malicious images with matching piece digests; the bounded consequence is downloaded-file integrity loss.
Summary
What happened
Weak integrity checks in dragonflyoss Dragonfly before 2.1.0 allow remote attackers to substitute malicious downloaded files via MD5 collisions. DragonFly2 hashes each piece with MD5, concatenates those digests into PieceMd5Sign, and accepts different pieces when their MD5 values collide. Exploitation requires participation as a peer and crafted benign and malicious images with matching piece digests; the bounded consequence is downloaded-file integrity loss.
The record
- CVE
- CVE-2025-59354
- Published
- Sep 17, 2025
- Updated
- Sep 17, 2025
- Vendor
- DragonflyDB
- Product
- Dragonfly
- Classifications
- CWE-328, T1659
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 17, 2025CVE publishedPublication date reported by the CVE source.
- Sep 17, 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?
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- Affected versionversion=< 2.1.0
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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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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