4.3

CVE-2025-6069: HTMLParser quadratic complexity when processing malformed inputs

Deferred
AliasesSUSE-SU-2025:02358-1SUSE-SU-2025:02460-1SUSE-SU-2025:02523-1
Published 17-06-2025Last modified 31-07-2026

Vulnerability summary

CVE-2025-6069 is a medium (CVSS 4.3) vulnerability in python software foundation cpython. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 48.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.60%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 24 · Related 19
DLA-4354-1DLA-4445-1OPENSUSE-SU-2025:15285-1OPENSUSE-SU-2025:15289-1OPENSUSE-SU-2025:15290-1OPENSUSE-SU-2025:15713-1

Timeline

  1. 17-06-2025
    PublishedVulnerability first disclosed.
  2. 31-07-2026
    Last modifiedVulnerability information updated.

Description

The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.60%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.59% 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

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

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

Opensuse12 products
  • python-base&distro=openSUSE Leap 15.6< 2.7.18-150000.80.1
  • python-doc&distro=openSUSE Leap 15.6< 2.7.18-150000.80.1
  • python310-core&distro=openSUSE Leap 15.6< 3.10.18-150400.4.85.1
  • python310-documentation&distro=openSUSE Leap 15.6< 3.10.18-150400.4.85.1
  • python310&distro=openSUSE Leap 15.6< 3.10.18-150400.4.85.1
Ubuntu12 products
  • jythonAll versions (No fix recorded)
  • python2.7All versions (No fix recorded)
  • python3.10< 3.10.12-1~22.04.11
  • python3.11< 3.11.0~rc1-1~22.04.1~esm5
  • python3.12< 3.12.3-1ubuntu0.8
Suse9 products
  • python-base&distro=SUSE Linux Enterprise Module for Package Hub 15 SP6< 2.7.18-150000.80.1
  • python-base&distro=SUSE Linux Enterprise Module for Package Hub 15 SP7< 2.7.18-150000.80.1
  • python-base&distro=SUSE Linux Enterprise Server LTSS Extended Security 12 SP5< 2.7.18-33.50.1
  • python-doc&distro=SUSE Linux Enterprise Server LTSS Extended Security 12 SP5< 2.7.18-33.50.1
  • python311-core&distro=SUSE Linux Enterprise Module for Public Cloud 15 SP4< 3.11.13-150400.9.63.1
Chainguard5 products
  • python-3.10< 3.10.18-r1
  • python-3.11< 3.11.13-r1
  • python-3.12< 3.12.11-r1
  • python-3.13< 3.13.5-r1
  • python-3.9< 3.9.23-r1
Debian4 products
  • jythonAll versions (No fix recorded)
  • pypy3All versions (No fix recorded) | < 7.3.21+dfsg-1
  • python3.11< 3.11.2-6+deb12u7
  • python3.13< 3.13.6-1 | < 3.13.5-2+deb13u1
Wolfi4 products
  • python-3.10< 3.10.18-r1
  • python-3.11< 3.11.13-r1
  • python-3.12< 3.12.11-r1
  • python-3.13< 3.13.5-r1
Python software foundation1 product
  • cpython< 3.9.24 | ≥ 3.10.0, < 3.10.19 | ≥ 3.11.0, < 3.11.14 | ≥ 3.12.0, < 3.12.12 | ≥ 3.13.0, < 3.13.6 | ≥ 3.14.0a1, < 3.14.0b3

7 vendors · 47 products

References

24 links
Show all 24 references