Issues

• pm_encoding_char_width returns 1 at EOF (n <= 0) for single-byte encodings, causing out-of-bounds read and diagnostic location overflow on "$-"

  ruby/prism#4375 · Filter by author stevenjohnstone opened on Nov 13, 2026

• Undefined behaviour (signed integer overflow) getting line and column of offset with line option set to INT32_MAX

  ruby/prism#4374 · Filter by author stevenjohnstone opened on Nov 12, 2026
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• Undefined behaviour (signed integer overflow) when indent mismatch with line option set to INT32_MAX.

  ruby/prism#4373 · Filter by author stevenjohnstone opened on Nov 12, 2026

• Prism::Translation::Parser raises NoMethodError for a method with a &nil parameter and a body

  ruby/prism#4370 · Filter by author bbatsov opened on Nov 11, 2026

• Heredoc and outer-context recovery at recursion depth / stack budget limit causes location underflow

  ruby/prism#4367 · Filter by author stevenjohnstone opened on Nov 11, 2026

• Unterminated =begin in heredoc interpolation causes trailing short-line read, lex mode leak, and location underflow

  ruby/prism#4365 · Filter by author stevenjohnstone opened on Nov 10, 2026

• InterpolatedSymbolNode start location is overwritten on subsequent interpolations in %I symbol arrays

  ruby/prism#4364 · Filter by author stevenjohnstone opened on Nov 10, 2026

• Unparsed heredocs during string and list interpolation error recovery strand PM_LEX_HEREDOC

  ruby/prism#4362 · Filter by author stevenjohnstone opened on Nov 10, 2026

• Discarding PM_TOKEN_HEREDOC_START in hash pattern key recovery strands PM_LEX_HEREDOC on the lex mode stack

  ruby/prism#4361 · Filter by author stevenjohnstone opened on Nov 10, 2026

• Stale parser->previous after parse_heredoc causes unsigned location length underflow on declaration line

  ruby/prism#4359 · Filter by author stevenjohnstone opened on Nov 10, 2026

• Unconsumed lookahead token used for ErrorRecoveryNode causes unsigned location length underflow

  ruby/prism#4358 · Filter by author stevenjohnstone opened on Nov 10, 2026

• Heredoc rewind inside unclosed interpolation causes unsigned location length underflow (~4 GB out-of-bounds read)

  ruby/prism#4357 · Filter by author stevenjohnstone opened on Nov 10, 2026