CVE-2026-0865

MEDIUMNVD 5.95.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.9 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
5.9EG
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: 5.9Exploit: None knownExposed services: Not assessed

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
5.9MEDIUMmedium 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)
Severity59% × 45%
The EG Score, 5.9 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 (10)

Auto-updated Aug 8, 2026
Patch available. 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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
jython2.7.2+repack1-3, 2.7.2+repack1-4, 2.7.2+repack1-5, 2.7.3+repack1-1
  • every version on: no fix on record
—
pypy37.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions)
  • every version on: no fix on record
—
python2.72.7.18-10 ... 2.7.18-9 (10 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:14(4)
PackageVulnerable rangeFix by version rangeDependents
jython2.7.3+repack1-1
  • every version on: no fix on record
—
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:12(3)
PackageVulnerable rangeFix by version rangeDependents
jython2.7.3+repack1-1
  • every version on: no fix on record
—
pypy37.3.11+dfsg-2 ... 8.0.0+dfsg-1 (31 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(3)
PackageVulnerable rangeFix by version rangeDependents
jython2.7.3+repack1-1
  • every version on: no fix on record
—
pypy37.3.19+dfsg-2 ... 8.0.0+dfsg-1 (13 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

(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 11× in last 7d / 28× 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 99 of 196 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 97 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-12 16:42 UTCEG score recompute
  5. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-11 20:17 UTCEG score recompute
  7. 2026-10-11 18:29 UTCEG score recompute
  8. 2026-10-11 15:03 UTCEG score recompute
  9. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-08 20:28 UTCOSV refresh
  13. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-06 15:17 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 14:25 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 44th percentile
Show 74 more
  1. 2026-09-19 03:00 UTCOSV refresh
  2. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  13. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  14. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-08-31 06:19 UTCOSV refresh
  17. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  26. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  27. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  28. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  29. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  30. 2026-08-14 13:25 UTCEG score recompute
  31. 2026-08-14 13:25 UTCVendor advisory
  32. 2026-08-14 13:25 UTCGHSA enrichmentGHSA-5mc7-p6pj-r3f5
  33. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  34. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  35. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  36. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  37. 2026-08-09 19:07 UTCEG score recompute
  38. 2026-08-09 19:07 UTCVendor advisory
  39. 2026-08-09 19:07 UTCGHSA enrichmentGHSA-5mc7-p6pj-r3f5
  40. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  41. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  42. 2026-08-08 00:09 UTCEG score recompute
  43. 2026-08-08 00:09 UTCVendor advisory
  44. 2026-08-08 00:09 UTCGHSA enrichmentGHSA-5mc7-p6pj-r3f5
  45. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  46. 2026-08-06 05:24 UTCEG score recompute
  47. 2026-08-06 05:24 UTCVendor advisory
  48. 2026-08-06 05:24 UTCGHSA enrichmentGHSA-5mc7-p6pj-r3f5
  49. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  50. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  51. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  52. 2026-08-03 10:35 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  53. 2026-08-02 22:44 UTCEG score recompute
  54. 2026-08-02 22:44 UTCVendor advisory
  55. 2026-08-02 22:44 UTCGHSA enrichmentGHSA-5mc7-p6pj-r3f5
  56. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  57. 2026-08-01 04:15 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  58. 2026-07-31 21:42 UTCOSV refresh
  59. 2026-07-30 16:27 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  60. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  61. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  62. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  63. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  64. 2026-07-25 14:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  65. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  66. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  67. 2026-07-23 03:04 UTCEG score recompute
  68. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  69. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  70. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  71. 2026-07-19 14:30 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  72. 2026-07-19 02:28 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  73. 2026-07-18 10:04 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  74. 2026-07-16 17:02 UTCEPSS rescoreEPSS 0.5% · 37th percentile

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Frequently asked(5)

What is CVE-2026-0865?
CVE-2026-0865 is a medium-severity vulnerability; its CVE record was published on January 20, 2026. User-controlled header names and values containing newlines can allow injecting HTTP headers.
When was the CVE record for CVE-2026-0865 published?
The CVE record for CVE-2026-0865 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-2026-0865 actively exploited?
CVE-2026-0865 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-2026-0865?
CVE-2026-0865 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-0865?
A fix for CVE-2026-0865 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-0865 are linked in the Vendor Advisories panel on this page.

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