CVE-2025-15282

MEDIUMNVD 6.06.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.0 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.0Exploit: None knownExposed: 0

A fix is available — apply it.

User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

CVSS v3
6.0
EG Score
6.0(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity60% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

January 20, 2026

Last Modified

June 17, 2026

Advisory Details (9)

Auto-updated Aug 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

Mailman 3 [CVE-2025-15282] Header injection via newlines in data URL mediatype - Security-announce - python.org

https://mail.python.org/archives/list/[email protected]/thread/X66HL7SISGJT33J53OHXMZT4DFLMHVKF/
github_pr

gh-143925: Reject control characters in data: URL mediatypes

Fix merged in python/cpython PR #143926 on 2026-01-20 — awaiting tagged release

https://github.com/python/cpython/pull/143926
generic

Reject control characters in data: URL mediatypes · Issue #143925 · python/cpython · GitHub

https://github.com/python/cpython/issues/143925
github_commit

commit f25509e78e8b (python/cpython)

Fix landed in python/cpython commit f25509e78e8b — awaiting tagged release

https://github.com/python/cpython/commit/f25509e78e8be6ea73c811ac2b8c928c28841b9f
github_commit

commit a35ca3be5842 (python/cpython)

Fix landed in python/cpython commit a35ca3be5842 — awaiting tagged release

https://github.com/python/cpython/commit/a35ca3be5842505dab74dc0b90b89cde0405017a
github_commit

commit 4ed11d3cd288 (python/cpython)

Fix landed in python/cpython commit 4ed11d3cd288 — awaiting tagged release

https://github.com/python/cpython/commit/4ed11d3cd288e6b90196a15c5a825a45d318fe47
github_commit

commit 3f396ca9d7bb (python/cpython)

Fix landed in python/cpython commit 3f396ca9d7bb — awaiting tagged release

https://github.com/python/cpython/commit/3f396ca9d7bbe2a50ea6b8c9b27c0082884d9f80
github_commit

commit 34d76b00dabd (python/cpython)

Fix landed in python/cpython commit 34d76b00dabd — awaiting tagged release

https://github.com/python/cpython/commit/34d76b00dabde81a793bd06dd8ecb057838c4b38
github_commit

commit 05356b1cc153 (python/cpython)

Fix landed in python/cpython commit 05356b1cc153 — awaiting tagged release

https://github.com/python/cpython/commit/05356b1cc153108aaf27f3b72ce438af4aa218c0

Vendor Advisories for CVE-2025-15282(9)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.13+esm21) @ xenial2026-06-08ubuntu
ubuntupython2.7-minimal (2.7.12-1ubuntu0~16.04.18+esm19) @ xenial2026-06-08ubuntu
redhatrhui5/rhua-rhel9:17797982222026-05-27redhat
redhatpython3.12-0:3.12.13-2.el10_22026-05-19redhat
redhatpython3.12-0:3.12.13-2.el9_82026-05-19redhat
redhatpython3.12-0:3.12.13-2.el8_102026-04-27redhat
redhatpython3-11-main-3.11.15-4.hum12026-04-17redhat
redhatpython3-12-main-3.12.13-3.hum12026-04-17redhat
redhatpython3-14-main-3.14.4-1.hum12026-04-11redhat
redhatpython3-13-main-3.13.13-1.hum12026-04-10redhat

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

(9 across 4 ecosystems)
Debian:14(3)
PackageVulnerable rangeFixed inDependents
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—
python3.133.13.11-1 ... 3.13.9-1 (6 versions)3.13.12-1—
python3.143.14.0-1 ... 3.14.2-1 (14 versions)3.14.3-1—
Debian:11(2)
PackageVulnerable rangeFixed inDependents
pypy37.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions)——
python3.93.9.2-1, 3.9.2-1+deb11u1, 3.9.2-1+deb11u2, 3.9.2-1+deb11u3, 3.9.2-1+deb11u43.9.2-1+deb11u5—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
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(2)
PackageVulnerable rangeFixed inDependents
pypy37.3.19+dfsg-2 ... 7.3.23+dfsg-1 (11 versions)——
python3.133.13.5-23.13.5-2+deb13u1—

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 8× in last 7d / 45× 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 179 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2025-15282?
CVE-2025-15282 is a medium vulnerability published on January 20, 2026. User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
When was CVE-2025-15282 disclosed?
CVE-2025-15282 was first published in the National Vulnerability Database on January 20, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-15282 actively exploited?
CVE-2025-15282 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.3% of all scored CVEs.
What is the CVSS score of CVE-2025-15282?
CVE-2025-15282 has a CVSS v3 base score of 6.0 (NVD).
How do I remediate CVE-2025-15282?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-15282, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-15282

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