CVE-2026-34483Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat.
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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
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-116
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
apache tomcat apache:tomcat | from 9.0.40 before 9.0.117; from 10.1.0 before 10.1.54; from 11.0.0 before 11.0.21 | NVD |
References
- https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228bmailing-list, vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/04/09/26mailing-list, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.