CVE-2026-17507

In Bouncy Castle for Java before 1.86, the MLS implementation org.bouncycastle.mls holds RFC 9420's uint32 leafindex in a signed int, so a wire value with the top bit set decodes to a negative number. That is a legitimate encoding rather than malformed input, and it must still decode, since the M...

CVE-2026-17507 MLS membership checks compare a uint32 leaf_index as signed, admitting an out-of-range sender

In Bouncy Castle for Java before 1.86, the MLS implementation org.bouncycastle.mls holds RFC 9420's uint32 leafindex in a signed int, so a wire value with the top bit set decodes to a negative number. That is a legitimate encoding rather than malformed input, and it must still decode, since the M...

CVE-2026-17507 MLS membership checks compare a uint32 leaf_index as signed, admitting an out-of-range sender

In Bouncy Castle for Java before 1.86, the MLS implementation org.bouncycastle.mls holds RFC 9420's uint32 leafindex in a signed int, so a wire value with the top bit set decodes to a negative number. That is a legitimate encoding rather than malformed input, and it must still decode, since the M...

CVE-2026-17507 MLS membership checks compare a uint32 leaf_index as signed, admitting an out-of-range sender

In Bouncy Castle for Java before 1.86, the MLS implementation org.bouncycastle.mls holds RFC 9420's uint32 leafindex in a signed int, so a wire value with the top bit set decodes to a negative number. That is a legitimate encoding rather than malformed input, and it must still decode, since the M...

CVE-2026-17507

The Bouncy Castle for Java library (before version 1.86 ) contains a vulnerability in the MLS implementation (org.bouncycastle.mls). The root cause is a signed to unsigned conversion error where an RFC 9420 uint32 leaf_index is stored as a signed integer. Because values with the top bit set decod...

EUVD-2026-91235

In Bouncy Castle for Java before 1.86, the MLS implementation org.bouncycastle.mls holds RFC 9420's uint32 leafindex in a signed int, so a wire value with the top bit set decodes to a negative number. That is a legitimate encoding rather than malformed input, and it must still decode, since the M...

CVE-2026-104480

Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client...

CVE-2026-104480

Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client...

CVE-2026-104480 Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership

Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client...

EUVD-2026-91159

Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client...

CVE-2026-104480 Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership

Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client...

CVE-2026-104480

Discord libdave versions before 1.2.0 are vulnerable to a flaw where the system fails to reject an MLS Welcome message if the resulting group roster contains an unrecognized participant. An attacker capable of controlling the DAVE signaling path (such as a voice gateway) can manipulate signaling ...

CVE-2026-104480: Detection of Error Condition Without Action

Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client...

PT-2026-104066

Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client...

CVE-2026-17507: Signed to Unsigned Conversion Error

In Bouncy Castle for Java before 1.86, the MLS implementation org.bouncycastle.mls holds RFC 9420's uint32 leafindex in a signed int, so a wire value with the top bit set decodes to a negative number. That is a legitimate encoding rather than malformed input, and it must still decode, since the M...

PT-2026-104127

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description The MLS implementation org.bouncycastle.mls incorrectly handles the leaf index a uint32 value from RFC 9420 by storing it as a signed integer. When a wire value has the top bit set, it...

WordPress MLS Import plugin < 7.0.4 - Subscriber+ Sensitive Information Disclosure via mlsimport_logger_per_item vulnerability

Subscriber+ Sensitive Information Disclosure via mlsimportloggerperitem vulnerability discovered by Shikhali Jamalzade in WordPress Plugin MLSImport: IDX Plugin & MLS Plugin for Real Estate Listings versions 7.0.4...

CVE-2026-12852

A flaw was found in Bouncy Castle for Java. A remote attacker could exploit this by providing a specially crafted message to the MLS wire decoder. The decoder allocates an attacker-declared opaque length without first performing a bounds check. This can lead to excessive memory allocation,...

CVE-2026-17515 MLS Import < 7.0.4 - Subscriber+ Sensitive Information Disclosure via mlsimport_logger_per_item

The MLSImport: IDX Plugin & MLS Plugin for Real Estate Listings WordPress plugin before 7.0.4 does not have authorisation and CSRF checks in one of its AJAX actions, allowing any authenticated user, such as a subscriber, to read the contents of the MLSImport: IDX Plugin & MLS Plugin for Real Esta...

CVE-2026-17515

The MLSImport: IDX Plugin & MLS Plugin for Real Estate Listings WordPress plugin, in versions prior to 7.0.4 , is vulnerable to sensitive information disclosure. The root cause is a lack of authorisation and CSRF checks in one of its AJAX actions (specifically mlsimport_logger_per_item). This fla...