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Fencer Vulns
high 7.5

CVE-2026-12802 json

CMS AuthEnvelopedData fails to enforce tag-length on decryption

published 2026-08-03 3 mo ago modified 2026-09-02 2 mo ago also EUVD-2026-52133

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

In Bouncy Castle for Java before 1.85, CMS AuthEnvelopedData fails to enforce tag-length on decryption. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

Patch / fix

  • Legion of the Bouncy Castle Inc. BC-JAVA 1.85
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA 2.73.12
  • Legion of the Bouncy Castle Inc. BC-FJA 1.0.12, 2.0.12, 2.1.12
  • bouncycastle Debian 14 1.86-1

debian advisories DEBIAN-CVE-2026-12802

  • bouncycastle SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.85-150200.3.38.1
  • bouncycastle SLES 16.0, SLES for SAP applications 16.0 1.85-160000.1.1

suse advisories SUSE-SU-2026:3559-1SUSE-SU-2026:23127-1SUSE-SU-2026:23150-1

  • bouncycastle openSUSE Leap 16.0 1.85-160000.1.1
  • bouncycastle openSUSE Tumbleweed 1.85-1.1

opensuse advisories openSUSE-SU-2026:21538-1openSUSE-SU-2026:11445-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-12802 updated cvss 7.5

bouncycastle: bcpkix-fips: Bouncy Castle for Java: Integrity compromise due to insufficient tag-length enforcement in CMS AuthEnvelopedData decryption.

  • Red Hat AMQ Broker 7 bcprov-jdk18on 1.84.0.redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 bcpkix-jdk18on 1.84.0.redhat-00001, bcprov-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001 Red Hat build of Apicurio Registry 3 bcprov-lts8on 2.73.10.redhat-00002
    affected: workaround, no fix available
  • Red Hat Ceph Storage 9 libarrow, parquet-libs
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Fuse 7 bcmail-jdk18on, bctls-jdk18on 1.72, bcpkix-jdk15to18 1.77, bcprov-jdk15to18 1.77, bcutil-jdk15to18 1.77, bcpg-jdk15on 1.68.0.redhat-00005, +7 more Red Hat JBoss Enterprise Application Platform 7 bcmail-jdk18on, bcpg-jdk15on 1.68.0.redhat-00005, bcpg-jdk18on 1.86.0.redhat-00001, bcmail-jdk15on 1.68.0.redhat-00005, bcpkix-jdk15on 1.68.0.redhat-00005, bcpkix-jdk18on 1.84.0.redhat-00001, +6 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Application Platform 8 bcpg-jdk18on 1.86.0.redhat-00001, bcpkix-jdk18on 1.84.0.redhat-00001, bcprov-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001, bcjmail-jdk18on 1.81.0.redhat-00001
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7 bcmail-jdk18on, bcpg-jdk18on 1.86.0.redhat-00001, bcpkix-jdk18on 1.84.0.redhat-00001, bcprov-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001
    affected: workaround, no fix available “Fix deferred”
  • Red Hat AMQ Broker 7 bcpkix-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001 Red Hat build of Apache Camel 4 for Quarkus 3 bcpg-jdk18on 1.86.0.redhat-00001, bcpkix-jdk18on 1.84.0.redhat-00001, bcprov-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001
    not affected: vulnerable code not present
  • Red Hat Build of Keycloak rhbk/keycloak-rhel9, bcpkix-jdk18on 1.84.0.redhat-00001, bcprov-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001
    not affected: vulnerable code cannot be controlled by adversary
  • Red Hat build of Quarkus bcpkix-jdk18on 1.84.0.redhat-00001, bcprov-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001
    not affected: vulnerable code not present
show 1 more
  • Red Hat JBoss Enterprise Application Platform Expansion Pack bcpg-jdk18on 1.86.0.redhat-00001, bcpkix-jdk18on 1.84.0.redhat-00001, bcprov-jdk18on 1.84.0.redhat-00001, bcutil-jdk18on 1.84.0.redhat-00001, bcjmail-jdk18on 1.81.0.redhat-00001
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 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
CNA 4.0 8.7 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/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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Legion of the Bouncy Castle Inc. BC-JAVA
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA
  • Legion of the Bouncy Castle Inc. BC-FJA

Classification

Weakness
  • CWE-354 Improper Validation of Integrity Check Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.