GCM chunking can lead to bad tag exception on decryption
Priority LOW 22CWE-1068Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00158 4th percentileScored 2026-11-07
Fix Fixed BC-LTS (Legion of the Bouncy Castle Inc.): 2.73.11BC-FJA (Legion of the Bouncy Castle Inc.): 2.1.3+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-LTS | 2.73.0 to before 2.73.11 | 2.73.11 | Patch available | CNA |
| Legion of the Bouncy Castle Inc. | BC-FJA | 2.1.0 to before 2.1.3 | 2.1.3 | Patch available | CNA |
| — | org.bouncycastle:bcprov-lts8on (Maven) | 2.73.0 to before 2.73.11 | 2.73.11 | Patch available | GHSA-mx76-r943-rf8g |
- BC-LTS VendorLegion of the Bouncy Castle Inc. Affected 2.73.0 to before 2.73.11 Fixed in 2.73.11 Patch available CNA
- BC-FJA VendorLegion of the Bouncy Castle Inc. Affected 2.1.0 to before 2.1.3 Fixed in 2.1.3 Patch available CNA
- org.bouncycastle:bcprov-lts8on (Maven) Vendor— Affected 2.73.0 to before 2.73.11 Fixed in 2.73.11 Patch available GHSA-mx76-r943-rf8g
Remediation
- Fix · CNA BC-LTS (Legion of the Bouncy Castle Inc.) Fixed in 2.73.11
- Fix · CNA BC-FJA (Legion of the Bouncy Castle Inc.) Fixed in 2.1.3
- Fix · GHSA-mx76-r943-rf8g org.bouncycastle:bcprov-lts8on (Maven) Fixed in 2.73.11 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-8149
- 2026-10-03 Alias added: GHSA-mx76-r943-rf8g
References
More Legion of the Bouncy Castle Inc. vulnerabilities
- TI-2018-15967 Legion of the Bouncy Castle Legion of the Bouncy Castle Java Cryptography APIs 1.58 up to… CVSS 3.1CRITICAL 9.8
- TI-2017-09736 BouncyCastle JCE TLS Bleichenbacher/ROBOT CVSS 3.0HIGH 7.5
- TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer value CVSS 4.0CRITICAL 9.3
- TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in CVSS 4.0CRITICAL 9.3
- TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificate CVSS 4.0CRITICAL 9.3
- TI-2026-07701 Name Constraints bypass via trailing dot in rfc822Name and URI CVSS 4.0CRITICAL 9.3
Sources
- CVE-2026-8149 · CVE Program
- CVE-2026-8149 · NVD
- FIRST EPSS
- GHSA-mx76-r943-rf8g · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences