Medium severity · published May 8, 2026
CVE-2026-8149
GCM chunking can lead to bad tag exception on decryption
5.1
CVSS
0.2%
EPSS
No
On KEV
Description
A vulnerability in Legion of the Bouncy Castle Inc. BC-LTS bcprov-lts8on on X86_64, AVX, AVX-512f, Linux, Legion of the Bouncy Castle Inc. BC-FJA bc-fips on Linux, X86_64, AVX, AVX-512f.
This vulnerability is associated with program files gcm128w, gcm512w, gcm128w.C, gcm512w.C.
This issue affects BC-LTS: from 2.73.0 before 2.73.11; BC-FJA: from 2.1.0 before 2.1.3.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BC
BC-FJA · Legion of the Bouncy Castle Inc.
2.1.0 before 2.1.3 · source: vendor
BC
BC-LTS · Legion of the Bouncy Castle Inc.
2.73.0 before 2.73.11 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8149
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8149
github.com
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149
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