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CVE-2026-126135

SMTP and POP3 response injection when using STARTTLS

If an attacker was able to perform a man-in-the-middle attack on an SMTP or POP3 server connection using STARTTLS, the attacker could inject server responses before the TLS handshake completed. Thunderbird would process these responses after the handshake, as if they had been received from the server over the encrypted connection. This could be used to make Thunderbird report a different outcome for sending or fetching mail, and to show attacker-controlled text in error messages. The encrypted connection itself was not compromised, and credentials were not exposed. Connections using SSL/TLS instead of STARTTLS were not affected. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Thunderbird
CVE-2026-124741

Busybox: stack buffer overflow in udhcpc6 send_d6_renew() and send_d6_release()

A flaw was found in BusyBox. The udhcpc6 DHCPv6 client does not properly validate the size of network options sent by a server before copying them into memory. A malicious DHCPv6 server on the local network can exploit this flaw by sending a crafted reply, triggering a stack-based buffer overflow. This vulnerability could allow an attacker to achieve arbitrary code execution with root privileges or cause a denial of service (DoS) crash.

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Hardened Images and 2 more
CVE-2026-129137

Local Privilege Escalation via Malformed Agent Configuration in Devolutions PowerShell Universal

Incorrect default permissions in the agent configuration folder in Devolutions PowerShell Universal 2026.3.4 and earlier allows a local unprivileged user to execute arbitrary code as SYSTEM via a crafted agent configuration file that points the agent to an attacker-controlled server.

CVSS n/a EPSS n/a KEV · Not listed
Vendors
Devolutions
Products
Powershell Universal
CVE-2026-128886

Dbus: server accept watch can be stalled by blocking nonce-tcp accept_with_noncefile path

A flaw was found in dbus when configured with the nonce-tcp transport. An unauthenticated attacker able to connect to an exposed listener can cause a Denial of Service (DoS) by opening a connection and withholding the expected authentication token. Because the server processes this verification without enforcing a timeout, the stalled connection blocks the accept process and prevents legitimate clients from establishing new connections.

CVSS 3.1 · 6.2 Medium EPSS n/a KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux