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CVE-2026-97031

Reject malformed ECH outer extension references in crypto/tls

Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Go Standard Library
Products
Crypto Tls
CVE-2026-32283

Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls

If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service. This only affects TLS 1.3.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2026-27137

Incorrect enforcement of email constraints in crypto/x509

When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2026-56862

Limit handshake messages we are willing to accept post-handshake in crypto/tls

Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Go Standard Library
Products
Crypto Tls
CVE-2026-42505

Invoking Encrypted Client Hello privacy leak in crypto/tls

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2025-68121

Unexpected session resumption in crypto/tls

During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between the initial handshake and the resumed handshake, the resumed handshake may succeed when it should have failed. This may happen when a user calls Config.Clone and mutates the returned Config, or uses Config.GetConfigForClient. This can cause a client to resume a session with a server that it would not have resumed with during the initial handshake, or cause a server to resume a session with a client that it would not have resumed with during the initial handshake.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2026-27138

Panic in name constraint checking for malformed certificates in crypto/x509

Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2025-61730

Handshake messages may be processed at the incorrect encryption level in crypto/tls

During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2025-61729

Excessive resource consumption when printing error string for host certificate validation in crypto/x509

Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certificate provided by a malicious actor can result in excessive resource consumption.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2025-61727

Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509

An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Go Standard Library Golang
Products
Crypto Tls Go
CVE-2023-39322

Memory exhaustion in QUIC connection handling in crypto/tls

QUIC connections do not set an upper bound on the amount of data buffered when reading post-handshake messages, allowing a malicious QUIC connection to cause unbounded memory growth. With fix, connections now consistently reject messages larger than 65KiB in size.

CVSS 3.1 · 7.5 High EPSS 1.3% KEV · Not listed
Vendors
Go Standard Library Golang Redhat
Products
Crypto Tls Go Acm and 15 more