Astra Linux – Vulnerability in Ruby 2.5, JRuby

A issue was discovered in Ruby between versions 2.6.7, 2.7.x up to 2.7.3, and 3.x up to 3.0.1. The Net::IMAP library does not raise an exception when the StartTLS command fails with an unknown response. This may allow man-in-the-middle attackers to bypass TLS protections by leveraging the network...

Linux Distros Unpatched Vulnerability : CVE-2026-55558

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220...

Oracle Linux 8 : curl (ELSA-2026-57462)

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-57462 advisory. - fix TLS/STARTTLS connection reuse vulnerability CVE-2026-8286 Tenable has extracted the preceding description block directly from the Oracle Linux security...

CVE-2026-55558

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

DEBIAN-CVE-2026-55558

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

CVE-2026-55558 aiosmtplib: STARTTLS response injection

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

CVE-2026-55558

CVE-2026-55558 affects aiosmtplib , an asynchronous SMTP client for Python's asyncio, in versions prior to 5.1.2 . The vulnerability resides in SMTPProtocol.start_tls (src/aiosmtplib/protocol.py), which consumes the server's 220 response and initiates the TLS handshake without clearing SMTPProtoc...

CVE-2026-55558 aiosmtplib: STARTTLS response injection

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.starttls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol.buffer. An active network attacker can place attacker-chosen SMTP...

curl: curl: Insecure connection establishment due to TLS configuration mismatch

A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security TLS configuration of the new transfer does not match the existing connection,...

PT-2026-79027

Name of the Vulnerable Software and Affected Versions aiosmtplib versions prior to 5.1.2 Description The SMTPProtocol.start tls function in src/aiosmtplib/protocol.py fails to clear the SMTPProtocol. buffer after consuming the server's 220 response and initiating the TLS handshake. A network...

curl security, bug fix, and enhancement update

7.61.1-34.el810.13 - fix TLS/STARTTLS connection reuse vulnerability CVE-2026-8286 7.61.1-34.el810.12 - NTLM: use HTTP/1.0 instead of HTTP/1.1 for compatibility RHEL-171912...

curl: curl: Insecure connection establishment due to TLS configuration mismatch

A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security TLS configuration of the new transfer does not match the existing connection,...

curl: curl: Insecure connection establishment due to TLS configuration mismatch

A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security TLS configuration of the new transfer does not match the existing connection,...

curl: curl: Insecure connection establishment due to TLS configuration mismatch

A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security TLS configuration of the new transfer does not match the existing connection,...

curl: Fix of CVE-2026-8286

CVE-2026-8286: fix connection reuse for STARTTLS with mismatching TLS config...

JLSEC-2026-1211 A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might...

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not...

Updated python-django packages fix security vulnerabilities

The updated package fixes security vulnerabilities: Signed cookie salt namespace collision in django.http.HttpRequest.getsignedcookie. CVE-2026-6873 Potential unencrypted email transmission via STARTTLS in the SMTP backend. CVE-2026-7666 Potential exposure of private data via case-sensitive...

OESA-2026-2986 curl security update

cURL is a computer software project providing a library libcurl and command-line tool curl for transferring data using various protocols. Security Fixes: A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or...

OESA-2026-2987 curl security update

cURL is a computer software project providing a library libcurl and command-line tool curl for transferring data using various protocols. Security Fixes: A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or...

OESA-2026-2988 curl security update

cURL is a computer software project providing a library libcurl and command-line tool curl for transferring data using various protocols. Security Fixes: A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or...