Cryptographic validation bypass via incomplete identity check
Published Dec 31, 2025 · Updated Dec 31, 2025
Improper point validation in libsodium before ad3004e allows local users to bypass subgroup checks with crafted Ed25519 points. The ge25519_is_on_main_subgroup check multiplies a point by L but tests only X = 0, omitting the required Y = Z identity condition and accepting mixed-order points. Only custom schemes that pass untrusted points to crypto_core_ed25519_is_valid_point are exposed; high-level signing APIs are unaffected, and resulting confidentiality or integrity loss depends on the scheme.
Summary
What happened
Improper point validation in libsodium before ad3004e allows local users to bypass subgroup checks with crafted Ed25519 points. The ge25519_is_on_main_subgroup check multiplies a point by L but tests only X = 0, omitting the required Y = Z identity condition and accepting mixed-order points. Only custom schemes that pass untrusted points to crypto_core_ed25519_is_valid_point are exposed; high-level signing APIs are unaffected, and resulting confidentiality or integrity loss depends on the scheme.
The record
- CVE
- CVE-2025-69277
- Published
- Dec 31, 2025
- Updated
- Dec 31, 2025
- Vendor
- libsodium
- Product
- libsodium
- Classifications
- CWE-184
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 31, 2025CVE publishedPublication date reported by the CVE source.
- Dec 31, 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=0 <ad3004ec8731730e93fcfbbc824e67eadc1c1bae
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What is affected?
Published CVSS scores
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Attacks
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Technologies
Your stack
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Your stack
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