Issues

• Cannot output integer-like strings as strings unless they pass the overly-restrictive integer regex

  yaml/pyyaml#966 · Filter by author lunalucadou opened on Sep 16, 2026
  1

• [GLD Serializer Benchmark] Python yaml 6.0.3 — spec compliance misses

  yaml/pyyaml#965 · Filter by author leo-gan opened on Sep 14, 2026

• Registry classmethods lose registrations when called concurrently (free-threading blocker)

  yaml/pyyaml#957 · Filter by author Meet-1010 opened on Aug 25, 2026

• Reentrant close() from a stream write() callback causes a segmentation fault

  yaml/pyyaml#956 · Filter by author marinelay opened on Aug 25, 2026

• Merge key precedence regression after PR #937

  yaml/pyyaml#953 · Filter by author wildoranges opened on Aug 23, 2026
  1

• Broken yaml-highlight/yaml_hl.py – still Python 2?

  yaml/pyyaml#952 · Filter by author pmhahn opened on Aug 14, 2026

• Python 3.15 support

  yaml/pyyaml#951 · Filter by author Houbein opened on Aug 12, 2026
  7

• safe_dump of a dict with a tuple key produces YAML that safe_load cannot parse

  yaml/pyyaml#938 · Filter by author BoxiYu opened on Jun 21, 2026

• safe_load raises raw KeyError/ValueError/IndexError instead of ConstructorError for !!bool/!!int/!!float with invalid values

  yaml/pyyaml#933 · Filter by author zhangjiashuo-cs opened on May 24, 2026

• No win32 wheel for Python3.14

  yaml/pyyaml#931 · Filter by author jiasli opened on May 22, 2026
  2

• Add riscv64 (linux_riscv64) wheel to PyPI releases

  yaml/pyyaml#924 · Filter by author gounthar opened on Mar 11, 2026

• How do I make yaml.dump render a <<:

  yaml/pyyaml#919 · Filter by author delfick opened on Feb 27, 2026
  1

• Leaks when importing yaml with the address sanitizer

  yaml/pyyaml#914 · Filter by author jmcarcell opened on Feb 15, 2026

• Feature request: partial loading using path-like specifier

  yaml/pyyaml#910 · Filter by author pdgendt opened on Feb 9, 2026

• ConstructorError handler accesses node.id causing AttributeError

  yaml/pyyaml#907 · Filter by author coco1629 opened on Jan 7, 2026
  1

• IndexError in scan_tag() and check_key() on empty input

  yaml/pyyaml#906 · Filter by author coco1629 opened on Jan 7, 2026
  1

• full_load() method shows inconsistent behavior when handling YAML tags.

  yaml/pyyaml#905 · Filter by author coco1629 opened on Dec 26, 2025
  3

• Reader.peek(index) throws IndexError when the stream ends, instead of returning '\0'

  yaml/pyyaml#904 · Filter by author coco1629 opened on Dec 26, 2025

• Segfault in Python 3.14.0a5, PyYaml 6.0.3

  yaml/pyyaml#903 · Filter by author skeledrew opened on Dec 12, 2025

• Unhashable type: list in yaml.org example

  yaml/pyyaml#902 · Filter by author snan opened on Nov 26, 2025
  3

• [Bug]: Unsafe Loader Allows Arbitrary Command Execution

  yaml/pyyaml#900 · Filter by author tylzh97 opened on Oct 21, 2025

• [Bug]: Invalid Timestamp and Complex Scalars Raise AttributeError and Crash

  yaml/pyyaml#899 · Filter by author tylzh97 opened on Oct 21, 2025

• [Bug]: Malformed Numeric Scalars Crash SafeLoader with ValueError

  yaml/pyyaml#898 · Filter by author tylzh97 opened on Oct 21, 2025

• [Bug]: Alias Cycles Produce Self-Referential Structures That Break Consumers

  yaml/pyyaml#896 · Filter by author tylzh97 opened on Oct 21, 2025

• [Bug]: Deeply Nested YAML Triggers SafeLoader RecursionError DoS

  yaml/pyyaml#895 · Filter by author tylzh97 opened on Oct 21, 2025