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CVE

CVE-2020-26939

In Legion of the Bouncy Castle BC before 1.61 and BC-FJA before 1.0.1.2, attackers can obtain sensitive information abou

In Legion of the Bouncy Castle BC before 1.61 and BC-FJA before 1.0.1.2, attackers can obtain sensitive information about a private exponent because of Observable Differences in Behavior to Error Inputs. This occurs in org.bouncycastle.crypto.encodings.OAEPEncoding. Sending invalid ciphertext that decrypts to a short payload in the OAEP Decoder could result in the throwing of an early exception, potentially leaking some information about the private exponent of the RSA private key performing the encryption.

MEDIUM · CVSS 5.3 EPSS 0.02437
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
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Weakness Classification

CWE-203Observable Discrepancy
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Affected Products & Versions

2
bouncycastle fips java api< 1.0.1.2
bouncycastle legion-of-the-bouncy-castle< 1.61
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Affected Packages

8
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.bouncycastle:bc-fips MODERATE fixed in 1.0.2
Maven org.bouncycastle:bcprov-ext-jdk15on MODERATE fixed in 1.61
Maven org.bouncycastle:bcprov-ext-jdk16 MODERATE fixed in 1.61
Maven org.bouncycastle:bcprov-jdk14 MODERATE fixed in 1.61
Maven org.bouncycastle:bcprov-jdk15 MODERATE fixed in 1.61
Maven org.bouncycastle:bcprov-jdk15on MODERATE fixed in 1.61
Maven org.bouncycastle:bcprov-jdk15to18 MODERATE fixed in 1.61
Maven org.bouncycastle:bcprov-jdk16 MODERATE fixed in 1.61
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Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD02 Nov 2020 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/bcgit/bc-java/wiki/CVE-2020-26939PatchThird Party Advisory
https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e%40%3Cissues.solr.apache.org%3E
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