CVE-2026-54739

Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-beta.1, Lemmy's login endpoint in crates/api/api/src/localuser/login.rs returns different errors depending on whether the usernameoremail value exists. LocalUserView::findbyemailorname propagates a NotFound respons...

CVE-2026-54739 Lemmy: Login Endpoint User Enumeration via HTTP Response Code Differential

Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-beta.1, Lemmy's login endpoint in crates/api/api/src/localuser/login.rs returns different errors depending on whether the usernameoremail value exists. LocalUserView::findbyemailorname propagates a NotFound respons...

CVE-2026-54739

In Lemmy versions before 0.19.19 and 1.0.0-beta.1, the login endpoint returns HTTP 404 for nonexistent accounts and HTTP 400 for wrong passwords on existing accounts, enabling unauthenticated user/email enumeration. No in-the-wild exploitation is reported. Upgrade to 0.19.19 or 1.0.0-beta.1.

CVE-2026-54739 Lemmy: Login Endpoint User Enumeration via HTTP Response Code Differential

Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-beta.1, Lemmy's login endpoint in crates/api/api/src/localuser/login.rs returns different errors depending on whether the usernameoremail value exists. LocalUserView::findbyemailorname propagates a NotFound respons...

httpd: incomplete fix for CVE-2023-38709

A flaw was found in httpd. The response headers are not sanitized before an HTTP response is sent when a malicious backend can insert a Content-Type, Content-Encoding, or some other headers. These issues lead to HTTP response splitting. This CVE provides a "complete" fix for CVE-2023-38709...

UBUNTU-CVE-2026-74998

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS Cascading Style Sheets proxy were not validated, which may result in information disclosure or XSS cross-site scripting via MIME sniffing...

[SECURITY] [DLA 4743-1] ironic security update

Debian LTS Advisory DLA-4743-1 [email protected] https://www.debian.org/lts/security/ Carlos Henrique Lima Melara August 16, 2026 https://wiki.debian.org/LTS Package : ironic Version : 1:21.4.4-0+deb12u2 CVE ID : CVE-2026-43003 CVE-2026-54421 Debian Bug : 1140012 1140187 1144214 Multipl...

K000162939: Python vulnerability CVE-2025-13836

Security Advisory Description When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS...

DEBIAN-CVE-2026-19879

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific...

UBUNTU-CVE-2026-19879

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific...

CVE-2026-19879

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific...

CVE-2026-19879

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific...

CVE-2026-19879 Io.undertow/undertow: undertow: http response header integrity issue due to character truncation

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific...

CVE-2026-19879

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific...

[SECURITY] [DSA 6441-1] python-httplib2 security update

------------------------------------------------------------------------- Debian Security Advisory DSA-6441-1 [email protected] https://www.debian.org/security/ Salvatore Bonaccorso August 14, 2026 https://www.debian.org/security/faq -...

Security Bulletin: IBM Transformation Extender Advanced is affected by IBM WebSphere Application Server Liberty vulnerabilities

Summary IBM Transformation Extender Advanced, also known as IBM Standards Processing Engine uses WebSphere Application Server Liberty which is affected by a denial of service, HTTP Response and Request Smuggling vulnerabilities. Vulnerability Details Refer to the security bulletins listed in the...

CVE-2026-19879: Incorrect Conversion between Numeric Types

A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific...

RockyLinux 10 : nghttp2 (RLSA-2026:54650)

The remote RockyLinux 10 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:54650 advisory. nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests CVE-2026-58055 Tenable has extracted the...

Linux Distros Unpatched Vulnerability : CVE-2026-19879

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The writeString method performs a silent narrowing cast from 16-bit...

JLSEC-2026-1286

The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object...