CVE-2026-35536: tornadoweb tornado
Vulnerability summary
CVE-2026-35536 is a high (CVSS 7.2) vulnerability in tornadoweb tornado. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.9% of scored vulnerabilities.
Severe, CVSS 7.2 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 10 · Related 3Timeline
- 03-04-2026PublishedVulnerability first disclosed.
- 03-04-2026Last modifiedVulnerability information updated.
Description
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 metrics
7 scores · 7 sources · 1 version- OSV · PypiEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NDiffers
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NDiffers
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NDiffers
- OSV · WolfiEcosystem advisory · calculated7.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- OSV · ChainguardEcosystem advisory · calculated7.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NDiffers
EPSS trend
Probability
0.25%
Chance of exploitation in the next 30 days
Percentile
16%
Versus all other CVEs
30-day change
Decrease -0.04 pp
From 0.29% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard1 product
- mitmproxy< 12.2.2-r1
Debian1 product
- python-tornadoAll versions (No fix recorded) | < 6.5.5-1
PyPI1 product
- tornado< 6.5.5
Tornadoweb1 product
- tornado< 6.5.5
Ubuntu1 product
- python-tornado< 4.2.1-1ubuntu3.1+esm3 | < 4.5.3-1ubuntu0.2+esm3 | < 6.1.0-3ubuntu0.1~esm5 | < 6.4.0-1ubuntu0.5 | < 6.4.2-3ubuntu0.3 | < 6.5.4-0.1ubuntu0.1
Wolfi1 product
- mitmproxy< 12.2.2-r1
6 vendors · 6 products
References
12 links- github.com/tornadoweb/tornado/security/advisories/GHSA-78cv-mqj4-43f7WEBAdvisoryREPORTVendor Advisory
