CVE-2026-12802: Atlassian Cryptographic Failure org.bouncycastle:bcpkix-lts8on Dependency in Bitbucket Data Center
This Atlassian advisory covers CVE-2026-12802 in Bitbucket Data Center and Server.
- CVE-2026-12802
Key facts
- Vendor rating
- High, CVSS 8.7
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber· base score 8.7, scored by bcorgAttack vector: network. Attack complexity: low. Attack requirements: none. Privileges required: none. User interaction: none. Confidentiality impact on the vulnerable system: none. Integrity impact on the vulnerable system: high. Availability impact on the vulnerable system: none. Confidentiality impact on subsequent systems: none. Integrity impact on subsequent systems: none. Availability impact on subsequent systems: none.- Weakness
- CWE-354 Improper Validation of Integrity Check Value
- CISA SSVC
- Exploitation: none observed. Automatable: yes. Technical impact: partial. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Bitbucket Data Center and Server: 10.5.0; Bitbucket Data Center and Server: 10.4.1 to 10.4.3; Bitbucket Data Center and Server: 10.3.0 to 10.3.2 and 7 more below
- Fixed in
- Bitbucket Data Center and Server: 10.5.1 Data Center Only, Bitbucket Data Center and Server: 10.2.8 (LTS) recommended Data Center Only, Bitbucket Data Center and Server: 9.4.26 (LTS) Data Center Only
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Cryptographic Failure org.bouncycastle:bcpkix-lts8on Dependency in Bitbucket Data Center. Affected: Bitbucket Data Center and Server.
Listed in Atlassian's Security Bulletin of October 20 2026.
Text from the source record.
- Bitbucket Data Center and Server: 10.5.0
- Bitbucket Data Center and Server: 10.4.1 to 10.4.3
- Bitbucket Data Center and Server: 10.3.0 to 10.3.2
- Bitbucket Data Center and Server: 10.2.0 to 10.2.7 (LTS)
- Bitbucket Data Center and Server: 10.1.1 to 10.1.5
- Bitbucket Data Center and Server: 10.0.0 to 10.0.2
- Bitbucket Data Center and Server: 9.6.0 to 9.6.5
- Bitbucket Data Center and Server: 9.5.0 to 9.5.2
- Bitbucket Data Center and Server: 9.4.0 to 9.4.24 (LTS)
- Bitbucket Data Center and Server: 9.3.0 to 9.3.2
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-12802
Upgrade to a fixed release named by Atlassian:
- Bitbucket Data Center and Server: 10.5.1 Data Center Only
- Bitbucket Data Center and Server: 10.2.8 (LTS) recommended Data Center Only
- Bitbucket Data Center and Server: 9.4.26 (LTS) Data Center Only
Vendor guidance
- Upgrade to a fixed version listed by Atlassian: Bitbucket Data Center and Server: 10.5.1 Data Center Only; Bitbucket Data Center and Server: 10.2.8 (LTS) recommended Data Center Only; Bitbucket Data Center and Server: 9.4.26 (LTS) Data Center Only.
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