Advisory details:
gitlab / maven/org.bouncycastle/bcpkix-jdk18on/CVE-2026-12802
| Advisory ID | gitlab/maven/org.bouncycastle/bcpkix-jdk18on/CVE-2026-12802 |
| Aliases |
CVE-2026-12802
|
| Summary | CMS AuthEnvelopedData fails to enforce tag-length on decryption Affects Bouncy Castle for Java before 1.85. CMS AuthEnvelopedData recipients applied no lower bound to the AEAD tag length declared in the content-encryption AlgorithmIdentifier, a field the tag itself does not cover. Re-encoding a message to declare a truncated ICV, as low as 32 bits for the CCM family, weakens forgery resistance proportionally while decryption still succeeds. Recipients now accept a minimum tag size and reject shorter declarations before returning content. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 0.0 |
| Risk | |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.bouncycastle/bcpkix-jdk18on/CVE-2026-12802.yml |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/bcgit/bc-java/commit/0fefa539e6ac5c66e1daee5a13b23d1d4769cc01 | ||
| https://github.com/bcgit/bc-java/wiki/CVE-2026-12802 | ||
| CVE-2026-12802 | https://nvd.nist.gov/vuln/detail/CVE-2026-12802 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
There are no SSVC decisions available.