4.8

CVE-2026-4539: pygments archetype.py AdlLexer redos

Deferred
AliasesMGASA-2026-0090SUSE-SU-2026:22058-1SUSE-SU-2026:22093-1
Published 22-03-2026Last modified 23-03-2026

Vulnerability summary

CVE-2026-4539 is a medium (CVSS 4.8) Uncontrolled Resource Consumption vulnerability in pygments. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 4.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.8/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-7C8G-PVH3-XG3J

Timeline

  1. 22-03-2026
    PublishedVulnerability first disclosed.
  2. 23-03-2026
    Last modifiedVulnerability information updated.

Description

A security flaw has been discovered in pygments up to 2.19.2. 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.

CVSS metrics

14 scores · 7 sources · 4 versions

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Pygments

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard135 products
  • airflow-2< 2.11.2-r4
  • airflow-3< 3.1.8-r10
  • airflow-core-2< 2.11.2-r2
  • airflow-core-3< 3.1.8-r2
  • ansible-operator< 1.42.3-r1
Wolfi57 products
  • airflow-3< 3.1.8-r10
  • az< 2.84.0-r4
  • dask-kubernetes< 2026.3.0-r2
  • datadog-agent-7.72All versions (No fix recorded)
  • datadog-agent-7.72-core-integrationsAll versions (No fix recorded)
Opensuse2 products
  • python-Pygments&distro=openSUSE Leap 16.0< 2.19.1-160000.3.1
  • python-Pygments&distro=openSUSE Tumbleweed< 2.20.0-2.1
Suse2 products
  • python-Pygments&distro=SUSE Linux Enterprise Server 16.0< 2.19.1-160000.3.1
  • python-Pygments&distro=SUSE Linux Enterprise Server for SAP applications 16.0< 2.19.1-160000.3.1
Debian1 product
  • pygmentsAll versions (No fix recorded) | < 2.20.0+dfsg-1
Mageia1 product
  • python-pygments< 2.15.1-1.1.mga9
PyPI1 product
  • pygments< 2.20.0
Ubuntu1 product
  • pygmentsAll versions (No fix recorded)

8 vendors · 200 products · Showing 200 of 201

References

23 links
Show all 23 references