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This PR contains the following updates:

Package	Change	Age	Confidence
pygments (changelog)	2.19.2 → 2.20.0

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Pygments has Regular Expression Denial of Service (ReDoS) due to Inefficient Regex for GUID Matching

CVE-2026-4539 / GHSA-5239-wwwm-4pmq

More information

Details

A security flaw has been discovered in pygments before 2.20.0. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Severity

• CVSS Score: 1.9 / 10 (Low)
• Vector String: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-4539
• https://github.com/pygments/pygments/issues/3058
• https://github.com/pygments/pygments
• https://vuldb.com/?ctiid.352327
• https://vuldb.com/?id.352327
• https://vuldb.com/?submit.774685
• https://github.com/pygments/pygments/pull/3064
• https://github.com/pygments/pygments/commit/24b8aa76c6cd6d70f39c6dd605cce319c98e2ccc
• https://github.com/pygments/pygments/releases/tag/2.20.0
• https://github.com/advisories/GHSA-5239-wwwm-4pmq

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

pygments/pygments (pygments)

v2.20.0

Compare Source

(released March 29th, 2026)

• New lexers:

  • Rell (#​2914)

• Updated lexers:

  • archetype: Fix catastrophic backtracking in GUID and ID patterns (#​3064)
  • ASN.1: Recognize minus sign and fix range operator (#​3014, #​3060)
  • C++: Add C++26 keywords (#​2955), add integer literal suffixes (#​2966)
  • ComponentPascal: Fix analyse_text (#​3028, #​3032)
  • Coq renamed to Rocq (#​2883, #​2908)
  • Cython: Various improvements (#​2932, #​2933)
  • Debian control: Improve architecture parsing (#​3052)
  • Devicetree: Add support for overlay/fragments (#​3021), add bytestring support (#​3022), fix catastrophic backtracking (#​3057)
  • Fennel: Various improvements (#​2911)
  • Haskell: Handle escape sequences in character literals (#​3069, #​1795)
  • Java: Add module keywords (#​2955)
  • Lean4: Add operators ]', ]?, ]! (#​2946)
  • LESS: Support single-line comments (#​3005)
  • LilyPond: Update to 2.25.29 (#​2974)
  • LLVM: Support C-style comments (#​3023, #​2978)
  • Lua(u): Fix catastrophic backtracking (#​3047)
  • Macaulay2: Update to 1.25.05 (#​2893), 1.25.11 (#​2988)
  • Mathematica: Various improvements (#​2957)
  • meson: Add additional operators (#​2919)
  • MySQL: Update keywords (#​2970)
  • org-Mode: Support both schedule and deadline (#​2899)
  • PHP: Add __PROPERTY__ magic constant (#​2924), add reserved keywords (#​3002)
  • PostgreSQL: Add more keywords (#​2985)
  • protobuf: Fix namespace tokenization (#​2929)
  • Python: Add t-string support (#​2973, #​3009, #​3010)
  • Tablegen: Fix infinite loop (#​2972, #​2940)
  • Tera Term macro: Add commands introduced in v5.3 through v5.6 (#​2951)
  • TOML: Support TOML 1.1.0 (#​3026, #​3027)
  • Turtle: Allow empty comment lines (#​2980)
  • XML: Added .xbrl as file ending (#​2890, #​2891)

• Drop Python 3.8, and add Python 3.14 as a supported version (#​2987, #​3012)

• Various improvements to autopygmentize (#​2894)

• Update onedark style to support more token types (#​2977)

• Update rtt style to support more token types (#​2895)

• Cache entry points to improve performance (#​2979)

• Fix xterm-256 color table (#​3043)

• Fix kwargs dictionary getting mutated on each call (#​3044)

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