CVE-2026-77762 Apache Tomcat - Race Condition

Apache Tomcat 8.5.59 through 8.5.100, 9.0.39 through 9.0.121, 10.1.0-M1 through 10.1.59, and 11.0.0-M1 through 11.0.25 contain a race condition caused by improper synchronization in HTTP/2 request handling, letting attackers inject trailer fields into other HTTP/2 requests, exploit requires crafted HTTP/2 requests.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Race Condition
Impact
Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-362

Vendor fix

Upgrade to versions 11.0.26, 10.1.60, or 9.0.122 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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