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CVE-2026-31790 on CTRL-OS 24.05

Packages: openssl, openssl_3_0, openssl_3_3

Status: Resolved

CVE Information

Issue summary: Applications using RSASVE key encapsulation to establish a secret encryption key can send contents of an uninitialized memory buffer to a malicious peer.

Impact summary: The uninitialized buffer might contain sensitive data from the previous execution of the application process which leads to sensitive data leakage to an attacker.

RSA_public_encrypt() returns the number of bytes written on success and -1 on error. The affected code tests only whether the return value is non-zero. As a result, if RSA encryption fails, encapsulation can still return success to the caller, set the output lengths, and leave the caller to use the contents of the ciphertext buffer as if a valid KEM ciphertext had been produced.

If applications use EVP_PKEY_encapsulate() with RSA/RSASVE on an attacker-supplied invalid RSA public key without first validating that key, then this may cause stale or uninitialized contents of the caller-provided ciphertext buffer to be disclosed to the attacker in place of the KEM ciphertext.

As a workaround calling EVP_PKEY_public_check() or EVP_PKEY_public_check_quick() before EVP_PKEY_encapsulate() will mitigate the issue.

The FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.1 and 3.0 are affected by this issue.

Updates

2026-05-15 16:22 CEST

Metadata changes:

  • Status for package openssl: “Resolved” (8d49aacc8164efc444c223d33744588b801dce46)
  • Status for package openssl_3_0: “Resolved” (8d49aacc8164efc444c223d33744588b801dce46)
  • Status for package openssl_3_3: “Resolved” (8d49aacc8164efc444c223d33744588b801dce46)

Comment:

Resolved by upgrading to OpenSSL 3.3.7 and 3.0.20.

2026-05-15 11:14 CEST

Metadata changes:

  • Status for package openssl: “In Progress”
  • Status for package openssl_3_0: “In Progress”
  • Status for package openssl_3_3: “In Progress”

2026-05-15 11:13 CEST

Metadata changes:

  • Status for package openssl: “Acknowledged”
  • Status for package openssl_3_0: “Acknowledged”
  • Status for package openssl_3_3: “Acknowledged”

2026-04-29 00:31 CEST

Metadata changes:

  • Status for package openssl: “Plausible”

(Amended on: 2026-05-13 10:46 CEST)