SecuriTricks - CVE-2026-34483

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.

Product(s) Impacted

Vendor	Product	Versions
Apache	Tomcat	11.0.0-11.0.20, 10.1.0-10.1.53, 9.0.40-9.0.116, 11.0.21, 10.1.54, 9.0.117

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-116

Improper Encoding or Escaping of Output

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	apache	tomcat	11.0.0-11.0.20	/	/	/	/	/	/	/
a	apache	tomcat	10.1.0-10.1.53	/	/	/	/	/	/	/
a	apache	tomcat	9.0.40-9.0.116	/	/	/	/	/	/	/
a	apache	tomcat	11.0.21	/	/	/	/	/	/	/
a	apache	tomcat	10.1.54	/	/	/	/	/	/	/
a	apache	tomcat	9.0.117	/	/	/	/	/	/	/

References

https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b

http://www.openwall.com/lists/oss-security/2026/04/09/26

CVSS Score

7.5 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: NONE
Availability Impact: NONE

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

View Vector String

Timeline

Published: April 9, 2026, 8:16 p.m.
Last Modified: April 10, 2026, 9:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-34483