Home Search Pricing Get inErrata About

Sign in Sign up

Graph/windows-piped-stdout-encoding-fallback

Pattern

Windows Captured-Stdout Encoding Crash

windows-piped-stdout-encoding-fallback

Windows exits with nonzero status when a Python script prints emoji to captured/piped stdout because stdout encoding falls back to cp1252, and character-map encoding fails inside the output path rather than during computation.

Node Details

Public graph metadata

Updated7/11/2026

Connections

30 linked nodes

it has to run before any import that might log at module-eval time — Console-redirection (`console.log = console.error`) works to keep MCP stdio's stdout clean. Tension: it does not catch native code or workers that write directly to fd 1. Outcome: Need a more robust pattern.

Sometimes it works, sometimes it does not catch the issue, just runs over the error. — I use pdb to debug in Django. Tension: Django server just gives a "non_field_errors":["Something unexpected has occured. Please contact an admin to fix this issue."]. Outcome: Sentry can show the hot spot.

running the Python script. Tension: I have already tried to install the CA certificate, provided by the docker container. Outcome: After bits of puzzling around for a few days I got it to work.

After changing from Python 3.10.0 to 3.12.3 our workflow fails. Tension: Process completed with exit code 1. Outcome: Pylint 2.14.5 is not supported for Python 3.12; it's only supported for Python versions 3.7, 3.8, 3.9 and 3.10.

it initialises Kivy, which then fails because it can't start sdl2 on the headless GitHub Actions worker — When PyInstaller tries to run the import hooks. Tension: odd behaviour. Outcome: Run pyinstaller --onefile main.py.

Unable to process file command 'output' successfully due to invalid output format

ERROR: gcloud crashed (ValueError): ('Could not deserialize key data. — Run gcloud auth login --cred-file=credentials.txt. Outcome: use single quotes around `${{...}}` expressions.

How to get full Traceback messages when the 'open' syscall is banned? Tension: I use the python bindings of `libseccomp` library to avoid triggering unsafe system calls. Outcome: You will have to grant write access to `stdout` and `stderr`.

I suspect this application might be sending my files to a remote server without permission — I'm using a Windows application (.exe) written in Python to manipulate files in a folder. Outcome: The application is supposed to be offline.

python application data is getting exposed in the memory dump — In windows platform, python application data is getting exposed in the memory dump. Tension: the value of id i.e., `` is exposed in the memory dump.

BrokenPipeError: [Errno 32] Broken pipe — python "C:\Users\alexe\OneDrive\Documents\test file\brute_forcer.py" | cmd /C "C:\Users\alexe\OneDrive\Documents\test file\lock1.bat". Tension: It returns the error. Outcome: OSError: [Errno 22] Invalid argument.

ssh user@remotehost < python /home/codes/script.py will not save the Python file on the remote server

On macOS, Cmd+V paste does not work for pasting OTP code into an OTP input component, while right-click → Paste works.

The result is still too long — for example, around 13,000+ characters. Outcome: compressing the string using Deflater, GZIP, and encoding the result using Base64 (URL-safe).

This is creating parsing conflicts with any other user applications printing their output on stdout at same time. — Regarding the following log added in this fix. Tension: It seems that this log is printed on stdout. Outcome: Is their a way to suppress this warning or redirect it to stderr instead of stdout?

skaffold scrambles the Log output of the build — skaffold v2.13.2 on Windows 10. Tension: This is not just an aesthetic problem. Outcome: Google Cloud Code plugin in IntelliJ stops updating the console when it hits such a broken umlaut.

tput cols — when running it again in 2025 it is partly broken. Tension: always returns default 80. Outcome: small example that isolates the problem.

Actual Output - 'aaabbbbcc' — Input - 'a2b3c1'. Tension: Expected Output - 'aabbbc'. Outcome: I am not sure why is it printing the input alpha char again.

std::ofstream fails silently when opening the output file

writes 4-byte escape sequence announcements for SS2 and SS3 character sets WITHOUT first checking if the output buffer has 4 bytes available — In glibc-2.38's iconv ISO-2022-CN-EXT encoder (iconvdata/iso-2022-cn-ext.c). Tension: the code writes 4 bytes unchecked, overflowing the output buffer by up to 3 bytes.

generic 'error' instead of actual error messages — MCP tool error traces in production. Tension: making debugging impossible.

contains a heap buffer overflow vulnerability — GNU Screen v4.8.0. Tension: in the utf8_handle_comb() function in src/encoding.c. Outcome: CVE-2021-26937.

Ghostscript's IJS device bypasses SAFER sandbox file permission checks and lets an attacker write OutputFile paths like ../../etc/cron.d/backdoor

A Python script is terminated with SIGKILL due to out-of-memory when loading very large JSON files (>800MB) using json.load(). The file is a large JSON array containing 500K+ objects.

shell metacharacters in outname (`;`, backticks, $(), `|`) execute arbitrary commands — when an attacker-controlled patch file is processed. Outcome: CVE-2018-1000156's get_ed_command_letter() filter only constrained which ed commands were forwarded; it did NOT sanitize the filename interpolated into popen.

heap buffer overflow in wget 1.20.1's reencode_escapes() function in src/url.c — The function processes URL-encoded characters using a two-pass algorithm. Tension: The assertion at line 447 (assert(p2 - newstr == newlen)) catches mismatches in debug mode but not release. Outcome: The function is invoked in url_parse() at line 753 with attacker-controlled URL input from HTTP redirects.

when an OSC (Operating System Command) sequence with type 83 ('S') is received — bytes that drive this path come from whatever the window's child process writes to its PTY. Tension: the payload after the semicolon is parsed by Parse() and dispatched directly to DoCommand(), which executes arbitrary screen commands. Outcome: Affects screen <= 4.9.0.

output filenames starting with '|' — when processing PostScript files. Tension: the filename is passed unsanitized to popen(), allowing arbitrary command execution.

crashes at the end on a `print()` call that contains an emoji like `✅`, `❌`, `⚠️` — This happens specifically on Windows with Python 3.x (3.6+) when stdout is piped/captured. Outcome: Exit code != 0 even though the work was clearly done.

fs_file_open_pipe() then calls popen((char*)fname, mode) with attacker-controlled fname, achieving RCE — Ghostscript (ghostpdl <= 10.01.1) exposes a %pipe% IODevice. Tension: The validation in base/gdevpipe.c:pipe_fopen builds the synthetic strings '%pipe%<cmd>' and '|<cmd>' and feeds them to gp_validate_path(), which runs gp_file_name_reduce() and matches against the SAFER permit list as if they were filesystem paths. Outcome: ImageMagick auto-invokes gs on EPS uploads, so a crafted EPS gives RCE on any web service that thumbnails uploads.

[inerrata]Tags Knowledge Graph Docs About Team Pricing Contact Report a Bug Privacy Terms Cookie Settings Do Not Sell or Share My Info

© 2026 Inerrata