CVE-2026-35536

MEDIUMNVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3% (19th 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
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

April 3, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Jul 26, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Incomplete validation of cookie attributes · Advisory · tornadoweb/tornado · GitHub

https://github.com/tornadoweb/tornado/security/advisories/GHSA-78cv-mqj4-43f7

Vendor Advisories for CVE-2026-35536(12)

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

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3-tornado (6.4.0-1ubuntu0.5) @ noble2026-07-26ubuntu
ubuntupython3-tornado (6.5.4-0.1ubuntu0.1) @ resolute2026-07-26ubuntu
redhatrhoai/odh-trustyai-nemo-guardrails-server-rhel9:17824716062026-07-09redhat
redhatpython-tornado-0:4.2.1-5.el7_9.32026-06-08redhat
redhatpython-tornado-0:6.4.2-2.el9_6.32026-05-26redhat
redhatpython-tornado-0:6.4.2-1.el10_0.22026-05-26redhat
redhatpython-tornado-0:6.4.2-1.el9_2.22026-05-26redhat
redhatpython-tornado-0:6.4.2-1.el9_4.22026-05-26redhat
redhatpython-tornado-0:6.5.5-1.el10_22026-05-19redhat
redhatpython-tornado-0:6.5.5-1.el9_82026-05-19redhat
redhatpython-tornado-0:6.5.5-1.el9_7.12026-05-05redhat
redhatpython-tornado-0:6.5.5-1.el10_1.12026-05-05redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-tornado6.1.0-1, 6.1.0-1+deb11u1, 6.1.0-1+deb11u2, 6.1.0-1+deb11u3
  • every version up to 6.1.0-1+deb11u4: fixed in 6.1.0-1+deb11u4
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-tornado6.2.0-3 ... 6.5.5-5 (24 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-tornado6.4.2-3 ... 6.5.5-5 (13 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-tornado6.4.2-3 ... 6.5.4-1 (6 versions)
  • every version up to 6.5.5-1: fixed in 6.5.5-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
tornado0.2 ... 6.5b1 (80 versions)
  • every version up to 6.5.5: fixed in 6.5.5
—

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 12× in last 7d / 29× 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 95 of 200 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 105 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-12 16:11 UTCEG score recompute
  3. 2026-10-11 19:53 UTCEG score recompute
  4. 2026-10-11 17:07 UTCEG score recompute
  5. 2026-10-11 14:34 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-11 02:01 UTCOSV refresh
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  22. 2026-09-21 13:49 UTCOSV refresh
  23. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  25. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 70 more
  1. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  4. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  5. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  6. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  7. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-09-02 11:14 UTCOSV refresh
  15. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  21. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  23. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  26. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  27. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  28. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  29. 2026-08-16 09:19 UTCEG score recompute
  30. 2026-08-16 09:19 UTCVendor advisory
  31. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  32. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  33. 2026-08-14 05:45 UTCVendor advisory
  34. 2026-08-12 20:00 UTCEG score recompute
  35. 2026-08-12 20:00 UTCVendor advisory
  36. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  37. 2026-08-11 06:57 UTCEG score recompute
  38. 2026-08-11 06:57 UTCVendor advisory
  39. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  40. 2026-08-10 06:10 UTCEG score recompute
  41. 2026-08-10 06:10 UTCVendor advisory
  42. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  43. 2026-08-09 05:17 UTCEG score recompute
  44. 2026-08-09 05:17 UTCVendor advisory
  45. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  46. 2026-08-07 15:24 UTCEG score recompute
  47. 2026-08-07 15:24 UTCVendor advisory
  48. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  49. 2026-08-06 00:21 UTCEG score recompute
  50. 2026-08-06 00:21 UTCVendor advisory
  51. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  52. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  53. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  54. 2026-08-03 22:41 UTCEG score recompute
  55. 2026-08-03 22:41 UTCVendor advisory
  56. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  57. 2026-08-02 14:37 UTCEG score recompute
  58. 2026-08-02 14:37 UTCVendor advisory
  59. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  60. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  61. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  62. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  63. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  64. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  65. 2026-07-26 09:21 UTCEG score recompute▼ 1.90
  66. 2026-07-26 09:21 UTCVendor advisory
  67. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  68. 2026-07-24 22:12 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM
  69. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  70. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.2% · 14th percentile

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

Frequently asked(5)

What is CVE-2026-35536?
CVE-2026-35536 is a medium-severity vulnerability; its CVE record was published on April 3, 2026. In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters.
When was the CVE record for CVE-2026-35536 published?
The CVE record for CVE-2026-35536 was published on April 3, 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 July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-35536 actively exploited?
CVE-2026-35536 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-35536?
CVE-2026-35536 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-35536?
A fix for CVE-2026-35536 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-35536 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-35536

Explore →

Is Your Infrastructure Affected by CVE-2026-35536?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs