Ciphertext correlation via all-zero CBC initialization vector
Published Aug 26, 2026 · Updated Aug 26, 2026
Weak IV generation in Spring Security allows attackers with read access to encrypted data to correlate identical plaintext values. AesBytesEncryptor's two-argument constructor, and CBC mode with a null IV generator, use an all-zero IV, so a given password and salt yield identical ciphertext for identical plaintext. Exploitation requires read access to the encrypted data store and exposes equality patterns while enabling offline dictionary comparisons.
Summary
What happened
Weak IV generation in Spring Security allows attackers with read access to encrypted data to correlate identical plaintext values. AesBytesEncryptor's two-argument constructor, and CBC mode with a null IV generator, use an all-zero IV, so a given password and salt yield identical ciphertext for identical plaintext. Exploitation requires read access to the encrypted data store and exposes equality patterns while enabling offline dictionary comparisons.
The record
- CVE
- CVE-2026-47842
- Published
- Aug 26, 2026
- Updated
- Aug 26, 2026
- Vendor
- Spring
- Product
- Spring Security
- Classifications
- CWE-1204, CAPEC-97, CAPEC-20
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 26, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 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?
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- Affected versionversion=5.7.0 <=5.7.25
- Affected versionversion=5.8.0 <=5.8.27
- Affected versionversion=6.4.0 <=6.4.18
- Affected versionversion=6.5.0 <=6.5.11
- Affected versionversion=7.0.0 <=7.0.6
- Affected versionversion=7.1.0
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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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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