CVE-2026-0865

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 62% 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
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

A fix is available — apply it.

User-controlled header names and values containing newlines can allow injecting HTTP headers.

CVSS v3
5.9
EG Score
5.9(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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

January 20, 2026

Last Modified

June 17, 2026

Advisory Details (10)

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

commit c592227ffb48 (python/cpython)

Fix landed in python/cpython commit c592227ffb48 — awaiting tagged release

https://github.com/python/cpython/commit/c592227ffb48679af9845a45dbb0875d975bb219
github_commit

commit bfba66008576 (python/cpython)

Fix landed in python/cpython commit bfba66008576 — awaiting tagged release

https://github.com/python/cpython/commit/bfba660085767f8c2d582134e9d511a85eda04cf
github_commit

commit 8bb044d29310 (python/cpython)

Fix landed in python/cpython commit 8bb044d29310 — awaiting tagged release

https://github.com/python/cpython/commit/8bb044d29310bb05d15086cdaa8bf64867d61a97
github_commit

commit 83ecd18779f2 (python/cpython)

Fix landed in python/cpython commit 83ecd18779f2 — awaiting tagged release

https://github.com/python/cpython/commit/83ecd18779f286d872f68bfce175651e407d9fff
github_commit

commit 66da7bf6fe7b (python/cpython)

Fix landed in python/cpython commit 66da7bf6fe7b — awaiting tagged release

https://github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6
github_commit

commit 4802b96a2cde (python/cpython)

Fix landed in python/cpython commit 4802b96a2cde — awaiting tagged release

https://github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5
github_commit

commit 2f840249550e (python/cpython)

Fix landed in python/cpython commit 2f840249550e — awaiting tagged release

https://github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2
github_commit

commit 286e3ac39984 (python/cpython)

Fix landed in python/cpython commit 286e3ac39984 — awaiting tagged release

https://github.com/python/cpython/commit/286e3ac39984fe85a17f4ab39c64d382137aae5f
github_commit

commit 23e3c0ae867c (python/cpython)

Fix landed in python/cpython commit 23e3c0ae867c — awaiting tagged release

https://github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510
github_commit

commit 22e4d55285ce (python/cpython)

Fix landed in python/cpython commit 22e4d55285ce — awaiting tagged release

https://github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58

Vendor Advisories for CVE-2026-0865(15)

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

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython2.7-minimal (2.7.6-8ubuntu0.6+esm29) @ trusty2026-06-08ubuntu
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.13+esm22) @ xenial2026-06-08ubuntu
ubuntupython3.12-venv (3.12.3-1ubuntu0.11) @ noble2026-06-08ubuntu
redhatrhui5/rhua-rhel9:17797982222026-05-27redhat
redhatpython3.11-0:3.11.13-7.el9_82026-05-19redhat
redhatpython3.14-0:3.14.4-2.el10_22026-05-19redhat
redhatpython3.9-0:3.9.25-5.el9_82026-05-19redhat
redhatpython3.14-0:3.14.4-2.el9_82026-05-19redhat
redhatpython3.12-0:3.12.12-6.el9_82026-05-19redhat
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
redhatpython3.11-0:3.11.7-1.el9_4.112026-03-31redhat
redhatrhceph/rhceph-8-rhel9:17740028672026-03-24redhat
redhatrhui5/rhua-rhel9:17736701372026-03-18redhat
redhatpython3.12-0:3.12.12-3.el10_1.12026-03-17redhat
redhatpython3.11-0:3.11.13-5.el8_102026-03-12redhat
redhatpython3.12-0:3.12.12-3.el8_102026-03-12redhat
redhatpython3.9-0:3.9.25-3.el9_7.12026-03-10redhat
redhatpython3-0:3.6.8-73.el8_102026-02-05redhat

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

(14 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——
pypy37.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions)——
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+deb11u3, 3.9.2-1+deb11u43.9.2-1+deb11u5—
Debian:14(4)
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—
python3.133.13.11-1 ... 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: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—

Weakness Classification(1)

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

Additional Vendor Advisories

(7)

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 / 41× 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 157 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-0865?
CVE-2026-0865 is a medium vulnerability published on January 20, 2026. User-controlled header names and values containing newlines can allow injecting HTTP headers.
When was CVE-2026-0865 disclosed?
CVE-2026-0865 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-2026-0865 actively exploited?
CVE-2026-0865 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 60.4% of all scored CVEs.
What is the CVSS score of CVE-2026-0865?
CVE-2026-0865 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-0865?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-0865, 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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