BIT-LIBPYTHON-2025-12781 base64.b64decode() always accepts "+/" characters, despite setting altchars

When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. Th...

Linux Distros Unpatched Vulnerability : CVE-2025-12781

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the base64 module the characters +/ will always be accepted, regardless...

DEBIAN-CVE-2025-12781

When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. Th...

CVE-2025-12781

When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. Th...

CVE-2025-12781 base64.b64decode() always accepts "+/" characters, despite setting altchars

When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. Th...

Incomplete List of Disallowed Inputs

Overview Affected versions of this package are vulnerable to Incomplete List of Disallowed Inputs in the b64decode, standardb64decode, and urlsafeb64decode functions when the altchars parameter is used. An attacker can cause logical errors or compromise data integrity by submitting input containi...

CVE-2025-12781

CVE-2025-12781 concerns the base64 module in Python, where b64decode(), standard_b64decode(), and urlsafe_b64decode() historically accept the characters "+/" regardless of the altchars parameter. The connected sources confirm this behavior and note that newer RFCs recommend restricting to the spe...

CVE-2025-12781 base64.b64decode() always accepts "+/" characters, despite setting altchars

When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. Th...

CVE-2025-12781

When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. Th...

PSF-2026-7

When passing data to the b64decode, standardb64decode, and urlsafeb64decode functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. Th...

CPython security vulnerabilities

CPython is a Python interpreter implemented in C language by the Python Foundation. CPython has security vulnerabilities, where functions such as b64decode, standardb64decode, and urlsafeb64decode always accept the + and/or character, which may lead to data integrity issues...

CVE-2025-59355

A vulnerability. When org.apache.linkis.metadata.util.HiveUtils.decode fails to perform Base64 decoding, it records the complete input parameter string in the log via logger.errorstr + "decode failed", e. If the input parameter contains sensitive information such as Hive Metastore keys, plaintext...

CVE-2026-22858 FreeRDP has a global-buffer-overflow in crypto_base64_decode

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c = ...

CVE-2026-22858

CVE-2026-22858 affects FreeRDP prior to 3.20.1, where a global-buffer-overflow can occur in the Base64 decoding path due to implementation‑defined char signedness causing out‑of‑bounds access. The vulnerability is fixed in 3.20.1; multiple advisories (SUSE/SLES/OpenSUSE/Fedora) reference updating...

CVE-2026-22858 FreeRDP has a global-buffer-overflow in crypto_base64_decode

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c = ...

CVE-2026-22697 CryptoLib Has Heap Buffer Overflow Vulnerability in KMC Base64 Decode Handling (KMC JSON base64ciphertext/base64cleartext)

CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures SDLS-EP to secure communications between a spacecraft running the core Flight System cFS and a ground station. Prior to version 1.4.3, CryptoLib’s KMC crypto service integration is...

CVE-2026-22697 CryptoLib Has Heap Buffer Overflow Vulnerability in KMC Base64 Decode Handling (KMC JSON base64ciphertext/base64cleartext)

CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures SDLS-EP to secure communications between a spacecraft running the core Flight System cFS and a ground station. Prior to version 1.4.3, CryptoLib’s KMC crypto service integration is...

FreeBSD : www/varnish-libvmod-digest -- base64 decoding vulnerability (64bec4c7-d785-11f0-a1c0-0050569f0b83)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 64bec4c7-d785-11f0-a1c0-0050569f0b83 advisory. varnish developers report: Common usage of vmod-digest is for basic HTTP authentication, in which case ...

Mozilla Thunderbird < 52.1

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 52.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2017-13 advisory. - Fixed potential buffer overflows in generated Firefox code due to CVE-2016-6354 issue in Flex...

CVE-2025-60641

The file mexcel.php in the Vfront 0.99.52 codebase contains a vulnerable call to unserializebase64decode$POST'mexcel', where $POST'mexcel' is user-controlled input. This input is decoded from base64 and deserialized without validation or use of the allowedclasses option, allowing an attacker to...