CVE-2026-86350

DiscoveredSep 23, 2026UpdatedSep 23, 2026

Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression in fix for CVE-2026-41293 can trigger request header mix-up. This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

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CVSS v3.1

9.1 CRITICAL

EPSS

0.48%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Sep 25, 2026 → Oct 26, 2026

▲ 0.17pp

0.31% → 0.48% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityNONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Connections

2 relationships

CWE-444

source

Timeline

disclosure → media coverage

Sep 23, 2026

Disclosure — published as a CVE record.

Oct 5, 2026

thehackernews.com reports: ⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests

Public PoC (1)

github.com/abraxas/CVE-2026-86350

Unverified third-party code — review before executing.