CVE-2026-34483 — HIGH (7.5)

Q: How severe is CVE-2026-34483?

CVE-2026-34483 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-34483?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Tomcat.

Vulnerability Description

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Apache	Tomcat	>= 9.0.40, < 9.0.117

Related Weaknesses (CWE)

CWE-116

References

https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228bMailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/09/26Mailing ListThird Party Advisory

FAQ

What is CVE-2026-34483?

CVE-2026-34483 is a vulnerability with a CVSS score of 7.5 (HIGH). Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10...

How severe is CVE-2026-34483?

CVE-2026-34483 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-34483?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Tomcat.