UBUNTU-CVE-2026-39821

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

CVE-2026-39821

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

CVE-2026-39821

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

CVE-2026-39821 Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

CVE-2026-39821

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

CVE-2026-39821 Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

EUVD-2026-31449

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

CVE-2026-39821

CVE-2026-39821 affects golang.org/x/net/idna; ToASCII/ToUnicode incorrectly accept Punycode-encoded labels that decode to ASCII-only labels (e.g., xn--example-.com). The issue can enable privilege escalation in programs that validate ASCII hostnames but later convert to Unicode, potentially grant...

GO-2026-5026 Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode"xn--example-.com" incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna...

Google Go 安全漏洞

Google Go is a static, strongly typed, compiled, concurrent programming language with garbage collection features from the American company Google. There is a security vulnerability in Google Go, which stems from the ToASCII and ToUnicode functions accepting Punycode encoded tags that are decoded...

Astra Linux – Vulnerability in libidn2

GNU libidn2 before version 2.2.0 fails to perform the round-trip checks specified in RFC3490, Section 4.2, when converting A-labels to U-labels. This allows, under certain circumstances, one domain to impersonate another. By creating a malicious domain that matches a target domain except for the...

Astra Linux – Vulnerability in curl

There is a vulnerability in the handling of certificate validation in curl v8.1.0, particularly in how wildcard patterns are matched when listed as “Subject Alternative Name” in TLS server certificates. Curls can be modified to use its own name matching function for TLS, rather than the one...

firefox: thunderbird: URL Bar Spoofing via Manipulated Punycode and Whitespace Characters

A flaw was found in Mozilla. The Mozilla Foundation's Security Advisory describes the following issue: A crafted URL containing Arabic script and whitespace characters could have hidden the true origin of the page, resulting in a potential spoofing attack...

ALSA-2026:18479 Important: qemu-kvm security update

Kernel-based Virtual Machine KVM is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM. Security Fixes: firefox: thunderbird: CSP Bypass and XSS Exposure via Web Compatibility Shi...

JLSEC-2026-409

An improper certificate validation vulnerability exists in curl v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl can be built to use its own name matching function for TLS rather than one provided by a TLS...

Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Roundcube Webmail vulnerabilities (USN-8223-1)

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8223-1 advisory. It was discovered that Roundcube Webmail mishandled Punycode xn-- domain names. An attacker could possibl...

USN-8223-1: Roundcube Webmail vulnerabilities

It was discovered that Roundcube Webmail mishandled Punycode xn-- domain names. An attacker could possibly use this issue to cause a homograph attack. CVE-2019-15237 It was discovered that Roundcube Webmail did not properly sanitize certain attributes when handling CSS within HTML messages and...

curl: no_proxy IDN mismatch: Unicode hostnames bypass proxy exclusion list

Summary Unicode IDN hostnames in noproxy are never converted to punycode before comparison, so they never match the request hostname which curl has already converted to punycode. A user who types noproxy="bücher.de" and requests http://bücher.de/ expects the proxy to be bypassed. Instead curl...

SUSE-SU-2026:20910-1 Security update for librsvg

This update for librsvg fixes the following issues: Update to version 2.60.2: - CVE-2024-12224: Fixed idna accepts Punycode labels that do not produce any non-ASCII when decoded bsc1243867. - CVE-2024-43806: Fixed memory explosion in rustix bsc1229950...

SUSE-SU-2026:0243-1 Security update for librsvg

This update for librsvg fixes the following issues: Update to version 2.57.4 - bsc1243867: + CVE-2024-12224: RUSTSEC-2024-0421 - idna accepts Punycode labels that do not produce any non-ASCII when decoded. + RUSTSEC-2024-0404 - Unsoundness in anstream...