CVE-2025-6069

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory published 2025-06-17. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.3Exploit: None knownExposed: 0

A fix is available — apply it.

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

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

June 17, 2025

Last Modified

July 31, 2026

Advisory Details (10)

Auto-updated Jul 30, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
github_commit

commit fdc9d214c01c (python/cpython)

Fix landed in python/cpython commit fdc9d214c01c — awaiting tagged release

https://github.com/python/cpython/commit/fdc9d214c01cb4588f540cfa03726bbf2a33fc15
github_commit

commit f3c6f882cddc (python/cpython)

Fix landed in python/cpython commit f3c6f882cddc — awaiting tagged release

https://github.com/python/cpython/commit/f3c6f882cddc8dc30320d2e73edf019e201394fc
github_commit

commit ab0893fd5c57 (python/cpython)

Fix landed in python/cpython commit ab0893fd5c57 — awaiting tagged release

https://github.com/python/cpython/commit/ab0893fd5c579d9cea30841680e6d35fc478afb5
github_commit

commit 8d1b3dfa0913 (python/cpython)

Fix landed in python/cpython commit 8d1b3dfa0913 — awaiting tagged release

https://github.com/python/cpython/commit/8d1b3dfa09135affbbf27fb8babcf3c11415df49
generic

Mailman 3 [CVE-2025-6069] HTMLParser quadratic complexity when processing malformed inputs - Security-announce - python.org

https://mail.python.org/archives/list/[email protected]/thread/K5PIYLR6EP3WR7ZOKKYQUWEDNQVUXOYM/
github_commit

commit d851f8e258c7 (python/cpython)

Fix landed in python/cpython commit d851f8e258c7 — awaiting tagged release

https://github.com/python/cpython/commit/d851f8e258c7328814943e923a7df81bca15df4b
github_commit

commit 6eb6c5dbfb52 (python/cpython)

Fix landed in python/cpython commit 6eb6c5dbfb52 — awaiting tagged release

https://github.com/python/cpython/commit/6eb6c5dbfb528bd07d77b60fd71fd05d81d45c41
github_commit

commit 4455cbabf991 (python/cpython)

Fix landed in python/cpython commit 4455cbabf991 — awaiting tagged release

https://github.com/python/cpython/commit/4455cbabf991e202185a25a631af206f60bbc949
github_pr

gh-135462: Fix quadratic complexity in processing special input in HTMLParser

Fix merged in python/cpython PR #135464 on 2025-06-13 — awaiting tagged release

https://github.com/python/cpython/pull/135464
generic

Worst case quadratic complexity in HTMLParser · Issue #135462 · python/cpython · GitHub

https://github.com/python/cpython/issues/135462

Vendor Advisories for CVE-2025-6069(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3.11-venv (3.11.0~rc1-1~22.04.1~esm5) @ jammy2026-07-31ubuntu
redhatrhceph/rhceph-7-rhel9:17695084552026-02-03redhat
redhatrhceph/rhceph-8-rhel9:17695123832026-02-02redhat
redhatrhui5/rhua-rhel9:17683770122026-01-15redhat
redhatdiscovery/discovery-ui-rhel9:17679045732026-01-08redhat
redhatpython3.9-0:3.9.25-2.el9_72025-12-18redhat
redhatpython39-devel:3.9-8100020251126112422.d47b87a42025-12-18redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(13 across 4 ecosystems)
Debian:11(4)
PackageVulnerable rangeFixed inDependents
jython2.7.2+repack1-3, 2.7.2+repack1-4, 2.7.2+repack1-5, 2.7.3+repack1-1——
pypy37.3.5+dfsg-2, 7.3.5+dfsg-2+deb11u1, 7.3.5+dfsg-2+deb11u2, 7.3.5+dfsg-2+deb11u3, 7.3.5+dfsg-2+deb11u47.3.5+dfsg-2+deb11u5—
python2.72.7.18-10 ... 2.7.18-9 (10 versions)——
python3.93.9.2-1, 3.9.2-1+deb11u1, 3.9.2-1+deb11u2, 3.9.2-1+deb11u33.9.2-1+deb11u4—
Debian:12(3)
PackageVulnerable rangeFixed inDependents
jython2.7.3+repack1-1——
pypy37.3.11+dfsg-2 ... 7.3.23+dfsg-1 (29 versions)——
python3.113.11.2-6 ... 3.11.2-6+deb12u6 (7 versions)3.11.2-6+deb12u7—
Debian:13(3)
PackageVulnerable rangeFixed inDependents
jython2.7.3+repack1-1——
pypy37.3.19+dfsg-2 ... 7.3.23+dfsg-1 (11 versions)——
python3.133.13.5-23.13.5-2+deb13u1—
Debian:14(3)
PackageVulnerable rangeFixed inDependents
jython2.7.3+repack1-1——
pypy37.3.19+dfsg-2, 7.3.20+dfsg-1, 7.3.20+dfsg-2, 7.3.20+dfsg-3, 7.3.20+dfsg-47.3.21+dfsg-1—
python3.133.13.5-23.13.6-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 169 total refreshes for this CVE.

  1. 2026-08-30 01:21 UTCEPSS rescore
  2. 2026-08-28 21:40 UTCEPSS rescore
  3. 2026-08-27 14:24 UTCEPSS rescore
  4. 2026-08-26 14:45 UTCEPSS rescore
  5. 2026-08-25 13:48 UTCEPSS rescore
  6. 2026-08-24 14:16 UTCEPSS rescore
  7. 2026-08-23 00:18 UTCEPSS rescore
  8. 2026-08-21 23:48 UTCEPSS rescore
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-19 17:03 UTCEPSS rescore
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-17 13:46 UTCEPSS rescore
  13. 2026-08-16 14:55 UTCEPSS rescore
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 21:07 UTCOSV refresh
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-12 13:50 UTCEPSS rescore
  19. 2026-08-11 13:42 UTCEPSS rescore
  20. 2026-08-10 23:59 UTCEPSS rescore
  21. 2026-08-09 13:46 UTCEPSS rescore
  22. 2026-08-08 16:36 UTCEPSS rescore
  23. 2026-08-07 16:27 UTCEPSS rescore
  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-05 19:17 UTCEPSS rescore
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  1. 2026-08-04 10:37 UTCEPSS rescore
  2. 2026-08-03 10:35 UTCEPSS rescore
  3. 2026-08-02 02:26 UTCEPSS rescore
  4. 2026-08-01 04:15 UTCEPSS rescore
  5. 2026-07-31 14:25 UTCEG score recompute
  6. 2026-07-31 14:25 UTCVendor advisory
  7. 2026-07-31 14:25 UTCGHSA enrichment
  8. 2026-07-31 14:09 UTCEG score recompute
  9. 2026-07-31 14:09 UTCVendor advisory
  10. 2026-07-31 14:09 UTCGHSA enrichment
  11. 2026-07-30 23:20 UTCEG score recompute
  12. 2026-07-30 23:20 UTCVendor advisory
  13. 2026-07-30 23:20 UTCGHSA enrichment
  14. 2026-07-30 22:22 UTCEG score recompute
  15. 2026-07-30 22:22 UTCVendor advisory
  16. 2026-07-30 22:21 UTCGHSA enrichment
  17. 2026-07-30 16:27 UTCEPSS rescore
  18. 2026-07-30 01:30 UTCEPSS rescore
  19. 2026-07-27 18:54 UTCOSV refresh
  20. 2026-07-27 14:13 UTCEPSS rescore
  21. 2026-07-26 14:54 UTCEPSS rescore
  22. 2026-07-26 14:54 UTCEPSS rescore
  23. 2026-07-25 14:17 UTCEPSS rescore
  24. 2026-07-25 14:17 UTCEPSS rescore
  25. 2026-07-24 14:17 UTCEPSS rescore
  26. 2026-07-23 14:18 UTCEPSS rescore
  27. 2026-07-23 14:18 UTCEPSS rescore
  28. 2026-07-23 03:00 UTCEG score recompute
  29. 2026-07-22 14:08 UTCEPSS rescore
  30. 2026-07-21 15:24 UTCEPSS rescore
  31. 2026-07-20 17:08 UTCEPSS rescore
  32. 2026-07-19 14:30 UTCEPSS rescore
  33. 2026-07-19 14:30 UTCEPSS rescore
  34. 2026-07-19 02:28 UTCEPSS rescore
  35. 2026-07-19 02:28 UTCEPSS rescore
  36. 2026-07-18 10:04 UTCEPSS rescore
  37. 2026-07-18 10:04 UTCEPSS rescore
  38. 2026-07-16 17:02 UTCEPSS rescore
  39. 2026-07-16 17:02 UTCEPSS rescore
  40. 2026-07-15 16:57 UTCEPSS rescore
  41. 2026-07-15 16:57 UTCEPSS rescore
  42. 2026-07-15 02:00 UTCEPSS rescore
  43. 2026-07-15 01:59 UTCEPSS rescore
  44. 2026-07-13 06:12 UTCEPSS rescore
  45. 2026-07-12 05:46 UTCEPSS rescore
  46. 2026-07-12 05:46 UTCEPSS rescore
  47. 2026-07-11 08:27 UTCEPSS rescore
  48. 2026-07-11 08:27 UTCEPSS rescore
  49. 2026-07-10 11:28 UTCOSV refresh
  50. 2026-07-09 19:10 UTCEPSS rescore
  51. 2026-07-08 15:15 UTCEPSS rescore
  52. 2026-07-07 13:46 UTCEPSS rescore
  53. 2026-07-06 16:27 UTCEPSS rescore
  54. 2026-07-06 02:23 UTCEPSS rescore
  55. 2026-07-05 02:30 UTCEPSS rescore
  56. 2026-07-05 02:30 UTCEPSS rescore
  57. 2026-07-04 06:31 UTCEPSS rescore
  58. 2026-07-04 06:31 UTCEPSS rescore
  59. 2026-07-01 15:06 UTCEPSS rescore
  60. 2026-06-30 23:22 UTCEPSS rescore
  61. 2026-06-30 23:22 UTCEPSS rescore
  62. 2026-06-29 14:06 UTCEPSS rescore
  63. 2026-06-29 14:06 UTCEPSS rescore
  64. 2026-06-28 14:07 UTCEPSS rescore
  65. 2026-06-28 14:07 UTCEPSS rescore
  66. 2026-06-28 04:56 UTCEPSS rescore
  67. 2026-06-28 04:56 UTCEPSS rescore
  68. 2026-06-27 03:08 UTCEPSS rescore
  69. 2026-06-25 13:49 UTCEPSS rescore
  70. 2026-06-25 13:49 UTCEPSS rescore
  71. 2026-06-24 14:05 UTCEPSS rescore
  72. 2026-06-24 14:04 UTCEPSS rescore
  73. 2026-06-23 21:32 UTCEPSS rescore
  74. 2026-06-22 14:25 UTCEPSS rescore
  75. 2026-06-22 14:25 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-6069?
CVE-2025-6069 is a medium vulnerability published on June 17, 2025. The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
When was CVE-2025-6069 disclosed?
CVE-2025-6069 was first published in the National Vulnerability Database on June 17, 2025, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-6069 actively exploited?
CVE-2025-6069 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.1% of all scored CVEs.
What is the CVSS score of CVE-2025-6069?
CVE-2025-6069 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2025-6069?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-6069, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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