Sensitive-data disclosure via failed RSASVE encryption
Published Apr 7, 2026 · Updated Apr 7, 2026
Uninitialized-memory disclosure in OpenSSL allows remote attackers to read stale process data via failed RSASVE key encapsulation. The RSA KEM implementation treats RSA_public_encrypt()'s -1 error return as success because it checks only for nonzero, sets output lengths, and exposes the caller-provided ciphertext buffer as valid output. Exposure requires an application to call EVP_PKEY_encapsulate() with RSA/RSASVE on an attacker-supplied invalid public key without validating it first; the returned buffer can reveal data left by an earlier process execution.
Summary
What happened
Uninitialized-memory disclosure in OpenSSL allows remote attackers to read stale process data via failed RSASVE key encapsulation. The RSA KEM implementation treats RSA_public_encrypt()'s -1 error return as success because it checks only for nonzero, sets output lengths, and exposes the caller-provided ciphertext buffer as valid output. Exposure requires an application to call EVP_PKEY_encapsulate() with RSA/RSASVE on an attacker-supplied invalid public key without validating it first; the returned buffer can reveal data left by an earlier process execution.
The record
- CVE
- CVE-2026-31790
- Published
- Apr 7, 2026
- Updated
- Apr 7, 2026
- Vendor
- OpenSSL Project
- Product
- OpenSSL
- Classifications
- CWE-754
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 7, 2026CVE publishedPublication date reported by the CVE source.
- Apr 7, 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=3.0.0 <3.0.20
- Affected versionversion=3.3.0 <3.3.7
- Affected versionversion=3.4.0 <3.4.5
- Affected versionversion=3.5.0 <3.5.6
- Affected versionversion=3.6.0 <3.6.2
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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