CVE catalog
CVE-2026-12852
In Bouncy Castle for Java before 1.85, MLS wire decoder allocates attacker-declared opaque length before bounds check.
- Severity
- High · CVSS 8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.49% · Oct 25, 2026
In Bouncy Castle for Java before 1.85, MLS wire decoder allocates attacker-declared opaque length before bounds check.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | bouncycastle | sid | 1.86.2-1 | fixed |
| Debian | bouncycastle | forky | 1.86-1 | fixed |
| Debian | bouncycastle | trixie | 1.80-3 | vulnerable |
| Debian | bouncycastle | bookworm | 1.72-2 | vulnerable |
| Cpe | bc-java | Not reported | 1.85 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | bouncycastle | source | sid | 1.86-1 | not yet assigned | Not reported | [1143536] |
| Debian | bouncycastle | source | forky | 1.86-1 | not yet assigned | Not reported | [1143536] |
| Debian | bouncycastle | source | trixie | (unfixed) | not yet assigned | Not reported | [1143536] |
| Debian | bouncycastle | source | bookworm | (unfixed) | not yet assigned | Not reported | [1143536] |
| Cpe | bc-java | cpe | Not reported | 1.85 | Not reported | NVD-CVE-2026-12852 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libbcjmail-java]Affected
Source package: [bouncycastle]
Details (2)
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
- [libbcmail-java]Affected
Source package: [bouncycastle]
Details (2)
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
- [libbcpg-java]Affected
Source package: [bouncycastle]
Details (2)
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
- [libbcpkix-java]Affected
Source package: [bouncycastle]
Details (2)
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
- [libbcprov-java]Affected
Source package: [bouncycastle]
Details (2)
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
- [libbctls-java]Affected
Source package: [bouncycastle]
Details (2)
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
- [libbcutil-java]Affected
Source package: [bouncycastle]
Details (2)
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
1.72-2· all · bookwormAffected
nvd · bouncycastle · debian · bookworm; nvd · bouncycastle · debian · 12
[Debian 13 (Trixie)]
- [libbcjmail-java]Affected
Source package: [bouncycastle]
Details (2)
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
- [libbcmail-java]Affected
Source package: [bouncycastle]
Details (2)
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
- [libbcpg-java]Affected
Source package: [bouncycastle]
Details (2)
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
- [libbcpkix-java]Affected
Source package: [bouncycastle]
Details (2)
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
- [libbcprov-java]Affected
Source package: [bouncycastle]
Details (2)
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
- [libbctls-java]Affected
Source package: [bouncycastle]
Details (2)
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
- [libbcutil-java]Affected
Source package: [bouncycastle]
Details (2)
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
1.80-3· all · trixieAffected
nvd · bouncycastle · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11445-1.json]
- [https://github.com/bcgit/bc-java/commit/a747038bb5bbd5e29fb2b7607ab38af1fd8d1790]
- [https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9012852]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-12852]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-12852]
- [https://security-tracker.debian.org/tracker/CVE-2026-12852]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12852.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2622.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]