CVE-2025-15282

MEDIUMNVD 6.06.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 6.0 under NVD CVSS v3. EPSS exploit probability: 0.5% (44th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
6.0EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.0Exploit: None knownExposed services: Not assessed

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
6.0MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100

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 (value × EchelonGraph’s weight)
Severity60% × 45%
The EG Score, 6.0 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

January 20, 2026

Last Modified

June 17, 2026

Advisory Details (9)

Auto-updated Aug 8, 2026
Patch available. Sources: github_pr, github_commit.
Web page

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 pull request

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
Web page

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
pypy37.3.19+dfsg-2, 7.3.20+dfsg-1, 7.3.20+dfsg-2, 7.3.20+dfsg-3, 7.3.20+dfsg-4
  • every version up to 7.3.21+dfsg-1: fixed in 7.3.21+dfsg-1
—
python3.133.13.11-1 ... 3.13.9-1 (6 versions)
  • every version up to 3.13.12-1: fixed in 3.13.12-1
—
python3.143.14.0-1 ... 3.14.2-1 (14 versions)
  • every version up to 3.14.3-1: fixed in 3.14.3-1
—
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions)
  • every version on: no fix on record
—
python3.93.9.2-1, 3.9.2-1+deb11u1, 3.9.2-1+deb11u2, 3.9.2-1+deb11u3, 3.9.2-1+deb11u4
  • every version up to 3.9.2-1+deb11u5: fixed in 3.9.2-1+deb11u5
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.11+dfsg-2 ... 7.3.23+dfsg-1 (29 versions)
  • every version on: no fix on record
—
python3.113.11.2-6 ... 3.11.2-6+deb12u6 (7 versions)
  • every version up to 3.11.2-6+deb12u7: fixed in 3.11.2-6+deb12u7
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.19+dfsg-2 ... 7.3.23+dfsg-1 (11 versions)
  • every version on: no fix on record
—
python3.133.13.5-2
  • every version up to 3.13.5-2+deb13u1: fixed in 3.13.5-2+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 11× in last 7d / 30× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 222 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 125 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-13 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-12 17:22 UTCEG score recompute
  5. 2026-10-12 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-10-11 20:53 UTCEG score recompute
  7. 2026-10-11 19:03 UTCEG score recompute
  8. 2026-10-11 15:43 UTCEG score recompute
  9. 2026-10-11 13:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-10-08 20:25 UTCOSV refresh
  13. 2026-10-08 17:08 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-09-26 15:57 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-09-22 14:47 UTCEPSS rescoreEPSS 0.5% · 44th percentile
Show 72 more
  1. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-09-19 02:36 UTCOSV refresh
  3. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-09-16 05:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-09-12 14:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-09-04 13:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-09-01 04:38 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-08-31 06:19 UTCOSV refresh
  21. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  26. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  27. 2026-08-24 14:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  28. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  29. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  30. 2026-08-20 22:54 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  32. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  33. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  34. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  35. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  36. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  37. 2026-08-14 13:26 UTCEG score recompute
  38. 2026-08-14 13:26 UTCVendor advisory
  39. 2026-08-14 13:26 UTCGHSA enrichmentGHSA-6rv6-r2f2-gqrc
  40. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  41. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  42. 2026-08-11 13:41 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  43. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  44. 2026-08-09 19:07 UTCEG score recompute
  45. 2026-08-09 19:07 UTCVendor advisory
  46. 2026-08-09 19:07 UTCGHSA enrichmentGHSA-6rv6-r2f2-gqrc
  47. 2026-08-09 13:45 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  48. 2026-08-08 00:09 UTCEG score recompute
  49. 2026-08-08 00:09 UTCVendor advisory
  50. 2026-08-08 00:09 UTCGHSA enrichmentGHSA-6rv6-r2f2-gqrc
  51. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  52. 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  53. 2026-08-06 05:24 UTCEG score recompute
  54. 2026-08-06 05:24 UTCVendor advisory
  55. 2026-08-06 05:24 UTCGHSA enrichmentGHSA-6rv6-r2f2-gqrc
  56. 2026-08-05 19:16 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  57. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  58. 2026-08-04 10:37 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  59. 2026-08-03 10:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  60. 2026-08-02 22:46 UTCEG score recompute
  61. 2026-08-02 22:46 UTCVendor advisory
  62. 2026-08-02 22:46 UTCGHSA enrichmentGHSA-6rv6-r2f2-gqrc
  63. 2026-08-02 02:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  64. 2026-08-01 04:14 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  65. 2026-07-31 21:42 UTCOSV refresh
  66. 2026-07-30 16:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  67. 2026-07-30 01:29 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  68. 2026-07-28 15:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  69. 2026-07-27 14:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  70. 2026-07-26 14:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  71. 2026-07-25 14:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  72. 2026-07-24 14:16 UTCEPSS rescoreEPSS 0.5% · 38th percentile

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-15282?
CVE-2025-15282 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2025-15282 published?
The CVE record for CVE-2025-15282 was published on January 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2025-15282 actively exploited?
CVE-2025-15282 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-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?
A fix for CVE-2025-15282 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-15282 are linked in the Vendor Advisories panel on this page.

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