CVE-2026-29146 | Apache Tomcat: EncryptInterceptor vulnerable to padding oracle attack by default

Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.

Published: 2026-04-09 Last update: 2026-04-14 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-29146 is rated High Risk (65.9/100): CVSS High severity, with high exploitation likelihood (EPSS 12.92%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.98% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-29146

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-21 9.94% 12.92% +2.98%
2 2026-05-15 0.10% 9.94% +9.84%
3 2026-04-15 — 0.10% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-29146

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-29146

GitHub Security Advisory for CVE-2026-29146

GHSA-h468-7pvh-8vr8 · Severity: high · Ecosystem: maven — Apache Tomcat: Padding Oracle vulnerability in EncryptInterceptor

OS Trackers for CVE-2026-29146

vendor priority summary link
debian not yet assigned CVE-2026-29146 not yet assigned priority: Debian including 3 source packages (tomcat10, tomcat11, tomcat9), 12 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 9, open 3. https://security-tracker.debian.org/tracker/CVE-2026-29146
redhat high — https://access.redhat.com/security/cve/CVE-2026-29146
suse high CVE-2026-29146 severity important: SUSE including 34 source package names (tomcat, tomcat-9.0.117-1.1, …), 34 product×package rows across 2 product lines (SUSE Linux Enterprise Server Teradata 12 SP3, openSUSE Tumbleweed): Fixed 33, Known Not Affected 1. https://www.suse.com/security/cve/CVE-2026-29146/
ubuntu medium CVE-2026-29146 medium priority: Ubuntu including 6 source packages (tomcat10, tomcat11, tomcat6, tomcat7, tomcat8, tomcat9), 33 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needs-triage 18, DNE 12, ignored 3. https://ubuntu.com/security/CVE-2026-29146

Affected software / configurations for CVE-2026-29146

Vendor Product Version Raw CPE
apache tomcat >= 7.0.100, <= 7.0.109 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 8.5.38, <= 8.5.100 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 9.0.13, < 9.0.116 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 10.0.0, < 10.1.53 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 11.0.0, < 11.0.20 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

References for CVE-2026-29146

cvelogic Threat Intelligence