Issues

• flex segfaults in yy_top_state

  westes/flex#748 · Filter by author nxg opened on Aug 5, 2026
  4

• segmentation fault while building Linux From Scratch 12.4

  westes/flex#744 · Filter by author aerospaced opened on Jul 2, 2026

• Infinite Loop (DoS) in parse.y error recovery via malformed rule byte (Lexer-Parser Desync)

  westes/flex#726 · Filter by author MarcSchoenefeld opened on Apr 15, 2026
  1

• Global Buffer Underflow (OOB Write) in scan.l via embedded null byte

  westes/flex#725 · Filter by author MarcSchoenefeld opened on Apr 15, 2026
  1

• Filter to replace M4

  westes/flex#718 · Filter by author Mightyjo opened on Feb 8, 2026
  9

• flex 2.6.4 can't be built for riscv64 arch

  westes/flex#713 · Filter by author dmitryikh opened on Oct 9, 2025
  1

• skeletons.c line 167: *cp++ --> cp++

  westes/flex#712 · Filter by author thobo70 opened on Aug 21, 2025
  1

• Flex 2.6.4 does not always recognize opening caret and disable implicit grouping

  westes/flex#700 · Filter by author meta-ed opened on Mar 5, 2025

• write command line switches into lex.yy.c

  westes/flex#677 · Filter by author chriskuku opened on Oct 13, 2024

• Where is the publishing GPG / PGP key?

  westes/flex#661 · Filter by author JonathanWilbur opened on Jul 8, 2024
  2

• Flex segfaults after reading EOF in input()

  westes/flex#636 · Filter by author nxg opened on Mar 19, 2024
  4

• Buffer overflow with -CF -8 options and 0x00 0xFF input

  westes/flex#628 · Filter by author szhorvat opened on Feb 25, 2024
  23

• can't enlarge buffer, but no REJECT

  westes/flex#620 · Filter by author jklowden opened on Jan 27, 2024
  12

• Inconsistent handling of in memory buffers compared to file buffers

  westes/flex#611 · Filter by author ogdenpm opened on Nov 22, 2023

• aarch64-linux-gnu-gcc build flex2.6.4 will error

  westes/flex#607 · Filter by author wangwenqiangGitHub opened on Nov 16, 2023
  2

• FYI: New warning for C++ lexer with gcc 13 -Wall

  westes/flex#601 · Filter by author zmajeed opened on Oct 19, 2023

• Broken yywrap()?

  westes/flex#593 · Filter by author rdratlos opened on Sep 26, 2023

• character } falls under {characters} rule on IBM z/OS

  westes/flex#586 · Filter by author alexgubanow opened on Sep 12, 2023
  6

• Flex fails to compile on UBI8 image with LLVM15+

  westes/flex#578 · Filter by author interistaadastra opened on Aug 11, 2023
  1

• flex: input rules are too complicated (>= 32000 NFA states)"

  westes/flex#572 · Filter by author zzxx-zx725 opened on Jun 16, 2023
  3

• Obvious yymore() usage not detected by Flex scanner, breaking wget build

  westes/flex#565 · Filter by author dcepelik opened on May 22, 2023
  4

• Calling input() at EOF doesn't return EOF character(-1).

  westes/flex#548 · Filter by author SouravKB opened on Dec 6, 2022
  4

• Calling yyless(n) after input() causes a character duplicated.

  westes/flex#547 · Filter by author SouravKB opened on Nov 20, 2022
  6

• pdf support is incomplete

  westes/flex#537 · Filter by author dctaylor87 opened on Jul 29, 2022
  20

• [Feature] Multibyte character matching

  westes/flex#519 · Filter by author jscott0 opened on Mar 21, 2022