CVE-2026-34483 | Apache Tomcat up to 8.5.82/8.5.100/9.0.116/10.1.53/11.0.20 JsonAccessLogValve escape output

VDB-356677 · CVE-2026-34483 · GCVE-0-2026-34483 APACHE TOMCAT UP TO 8.5.82/8.5.100/9.0.116/10.1.53/11.0.20 JSONACCESSLOGVALVE ESCAPE OUTPUT HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 1.37 Summaryinfo A vulnerability classified as problematic has been found in Apache Tomcat up to 8.5.82/8.5.100/9.0.116/10.1.53/11.0.20. This affects an unknown part of the component JsonAccessLogValve. This manipulation causes escape output. This vulnerability is tracked as CVE-2026-34483. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in Apache Tomcat up to 8.5.82/8.5.100/9.0.116/10.1.53/11.0.20. It has been declared as problematic. Affected by this vulnerability is some unknown processing of the component JsonAccessLogValve. The manipulation with an unknown input leads to a escape output vulnerability. The CWE definition for the vulnerability is CWE-116. 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. As an impact it is known to affect integrity. The summary by CVE is: 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. The weakness was disclosed by Bartlomiej Dmitruk. The advisory is shared at lists.apache.org. This vulnerability is known as CVE-2026-34483 since 03/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/09/2026). Upgrading to version 9.0.117, 10.1.54 or 11.0.21 eliminates this vulnerability. Productinfo Type Application Server Software Vendor Apache Name Tomcat Version 8.0 8.1 8.2 8.3 8.4 8.5.0 8.5.1 8.5.2 8.5.3 8.5.4 8.5.5 8.5.6 8.5.7 8.5.8 8.5.9 8.5.10 8.5.11 8.5.12 8.5.13 8.5.14 8.5.15 8.5.16 8.5.17 8.5.18 8.5.19 8.5.20 8.5.21 8.5.22 8.5.23 8.5.24 8.5.25 8.5.26 8.5.27 8.5.28 8.5.29 8.5.30 8.5.31 8.5.32 8.5.33 8.5.34 8.5.35 8.5.36 8.5.37 8.5.38 8.5.39 8.5.40 8.5.41 8.5.42 8.5.43 8.5.44 8.5.45 8.5.46 8.5.47 8.5.48 8.5.49 8.5.50 8.5.51 8.5.52 8.5.53 8.5.54 8.5.55 8.5.56 8.5.57 8.5.58 8.5.59 8.5.60 8.5.61 8.5.62 8.5.63 8.5.64 8.5.65 8.5.66 8.5.67 8.5.68 8.5.69 8.5.70 8.5.71 8.5.72 8.5.73 8.5.74 8.5.75 8.5.76 8.5.77 8.5.78 8.5.79 8.5.80 8.5.81 8.5.82 8.5.100 9.0.116 10.1.0 10.1.1 10.1.2 10.1.3 10.1.4 10.1.5 10.1.6 10.1.7 10.1.8 10.1.9 10.1.10 10.1.11 10.1.12 10.1.13 10.1.14 10.1.15 10.1.16 10.1.17 10.1.18 10.1.19 10.1.20 10.1.21 10.1.22 10.1.23 10.1.24 10.1.25 10.1.26 10.1.27 10.1.28 10.1.29 10.1.30 10.1.31 10.1.32 10.1.33 10.1.34 10.1.35 10.1.36 10.1.37 10.1.38 10.1.39 10.1.40 10.1.41 10.1.42 10.1.43 10.1.44 10.1.45 10.1.46 10.1.47 10.1.48 10.1.49 10.1.50 10.1.51 10.1.52 10.1.53 11.0.0 11.0.1 11.0.2 11.0.3 11.0.4 11.0.5 11.0.6 11.0.7 11.0.8 11.0.9 11.0.10 11.0.11 11.0.12 11.0.13 11.0.14 11.0.15 11.0.16 11.0.17 11.0.18 11.0.19 11.0.20 License open-source Website Vendor: https://www.apache.org/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Escape output CWE: CWE-116 / CWE-74 / CWE-707 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Tomcat 9.0.117/10.1.54/11.0.21 Timelineinfo 03/30/2026 CVE reserved 04/09/2026 +10 days Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Vendor: apache.org Advisory: lists.apache.org Researcher: Bartlomiej Dmitruk Status: Confirmed CVE: CVE-2026-34483 (🔒) GCVE (CVE): GCVE-0-2026-34483 GCVE (VulDB): GCVE-100-356677 Entryinfo Created: 04/09/2026 22:11 Changes: 04/09/2026 22:11 (56) Complete: 🔍 Cache ID: 99:F60:101 Discussion No comments yet. 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