CVE-2026-12803highCWE-354

CVE-2026-12803: fallo de gravedad alta en Legion of the Bouncy Castle Inc. BC-JAVA

KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery)

Publicada el

Seguir esta CVE+ Monitorear BC-JAVA+ Monitorear BC-LTS-JAVA

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

21Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 8.7epss 0.2%
In Bouncy Castle for Java before 1.85, KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery). This issue also affects Bouncy Castle for Java LTS before 2.73.12.
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
Productos afectados
Legion of the Bouncy Castle Inc. · BC-JAVALegion of the Bouncy Castle Inc. · BC-LTS-JAVA
CVEs relacionadas — Legion of the Bouncy Castle Inc. BC-JAVA

En el mismo producto, de las más peligrosas a las menos.

CVE-2026-5598HIGHNon-constant time comparisons risk private key leakage in FrodoKEM.EPSS 0.9%CVE-2026-3505HIGHUnbounded PGP AEAD chunk size leads to pre-auth resource exhaustion.EPSS 0.8%CVE-2026-5588MEDIUMPKIX draft CompositeVerifier accepts empty signature sequence as valid.EPSS 0.8%CVE-2026-13586MEDIUMPKCS#12 MAC and bag-decryption KDF iteration-count bound (DoS)EPSS 0.6%CVE-2026-58060HIGHHSS public-key level count unbounded, enabling huge allocation on verifyEPSS 0.6%CVE-2026-0636MEDIUMLDAP Injection Vulnerability in LDAPStoreHelper.javaEPSS 0.5%