CVE-2026-31790 (GCVE-0-2026-31790)

Vulnerability from cvelistv5 – Published: 2026-04-07 22:00 – Updated: 2026-05-12 12:09
VLAI
Title
Incorrect Failure Handling in RSA KEM RSASVE Encapsulation
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.2 (semver)
Affected: 3.5.0 , < 3.5.6 (semver)
Affected: 3.4.0 , < 3.4.5 (semver)
Affected: 3.3.0 , < 3.3.7 (semver)
Affected: 3.0.0 , < 3.0.20 (semver)
Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
Create a notification for this product.
Date Public
2026-04-07 14:00
Credits
Simo Sorce (Red Hat) Nikola Pajkovsky
Show details on NVD website
To clipboard 

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The affected code tests only whether the return value is non-zero.\\nAs a result, if RSA encryption fails, encapsulation can still return success to\\nthe caller, set the output lengths, and leave the caller to use the contents of\\nthe ciphertext buffer as if a valid KEM ciphertext had been produced.\\n\\nIf applications use EVP_PKEY_encapsulate() with RSA/RSASVE on an\\nattacker-supplied invalid RSA public key without first validating that key,\\nthen this may cause stale or uninitialized contents of the caller-provided\\nciphertext buffer to be disclosed to the attacker in place of the KEM\\nciphertext.\\n\\nAs a workaround calling EVP_PKEY_public_check() or\\nEVP_PKEY_public_check_quick() before EVP_PKEY_encapsulate() will mitigate\\nthe issue.\\n\\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.1 and 3.0 are affected by this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: Applications using RSASVE key encapsulation to establish\u003cbr\u003ea secret encryption key can send contents of an uninitialized memory buffer to\u003cbr\u003ea malicious peer.\u003cbr\u003e\u003cbr\u003eImpact summary: The uninitialized buffer might contain sensitive data from the\u003cbr\u003eprevious execution of the application process which leads to sensitive data\u003cbr\u003eleakage to an attacker.\u003cbr\u003e\u003cbr\u003eRSA_public_encrypt() returns the number of bytes written on success and -1\u003cbr\u003eon error. The affected code tests only whether the return value is non-zero.\u003cbr\u003eAs a result, if RSA encryption fails, encapsulation can still return success to\u003cbr\u003ethe caller, set the output lengths, and leave the caller to use the contents of\u003cbr\u003ethe ciphertext buffer as if a valid KEM ciphertext had been produced.\u003cbr\u003e\u003cbr\u003eIf applications use EVP_PKEY_encapsulate() with RSA/RSASVE on an\u003cbr\u003eattacker-supplied invalid RSA public key without first validating that key,\u003cbr\u003ethen this may cause stale or uninitialized contents of the caller-provided\u003cbr\u003eciphertext buffer to be disclosed to the attacker in place of the KEM\u003cbr\u003eciphertext.\u003cbr\u003e\u003cbr\u003eAs a workaround calling EVP_PKEY_public_check() or\u003cbr\u003eEVP_PKEY_public_check_quick() before EVP_PKEY_encapsulate() will mitigate\u003cbr\u003ethe issue.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.1 and 3.0 are affected by this issue.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-754\", \"description\": \"CWE-754 Improper Check for Unusual or Exceptional Conditions\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-04-07T22:00:56.698Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31790\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-08T14:32:37.439Z\", \"dateReserved\": \"2026-03-09T15:56:53.191Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-04-07T22:00:56.698Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.