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    CVE-2026-12802

    In Bouncy Castle for Java before 1.85, CMS AuthEnvelopedData fails to enforce tag-length on decryption. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

    Published:Aug 3, 2026
    Last Modified:Sep 2, 2026
    EPS:Aug 3, 2026
    EPSS Score:0.00147
    CVSS Score:7.5

    Affected Products

    Vendor
    Bouncycastle
    Product
    Bc-java
    Vendor
    Bouncycastle
    Product
    Bcpkix-fips
    Vendor
    Bouncycastle
    Product
    Bouncy Castle For Java Lts
    Vendor
    Legion Of The Bouncy Castle Inc.
    Product
    Bc-fja
    Vendor
    Legion Of The Bouncy Castle Inc.
    Product
    Bc-java
    Vendor
    Legion Of The Bouncy Castle Inc.
    Product
    Bc-lts-java

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-12852 (CVSS 8.7) — In Bouncy Castle for Java before 1.85, MLS wire decoder allocates attacker-declared opaque length before bound…
    CVE-2026-12817 (CVSS 8.7) — In Bouncy Castle for Java before 1.85, OpenPGP AEAD decryption skips final tag on chunk-aligned data. This iss…
    CVE-2026-12816 (CVSS 8.7) — In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This …
    CVE-2026-12803 (CVSS 8.7) — In Bouncy Castle for Java before 1.85, KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce…
    CVE-2026-14682 (CVSS 8.7) — In Bouncy Castle for Java before 1.85, Possible OOM from unbounded up-front allocation on a definite-length re…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High