CVE-2026-8149

GCM chunking can lead to bad tag exception on decryption

State: Published
Severity: 5.1 Medium
Published: May 8, 2026
Updated: Jul 21, 2026
Reserved: May 8, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/S:N/RE:M/U:Amber	bcorg

Weaknesses

CWE-1068

Affected Products

Product	Versions
BC-LTSLegion of the Bouncy Castle Inc.	2.73.0 to before 2.73.11Affected
BC-FJALegion of the Bouncy Castle Inc.	2.1.0 to before 2.1.3Affected

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908149vendor-advisory

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