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Apache Tomcat CVE-2026-43514

| EUVDEUVD-2026-29518 LOW
Observable Timing Discrepancy (CWE-208)
2026-05-12 apache GHSA-9m89-8frq-c98c
Apache Information Disclosure Tomcat Apache Tomcat
3.7
CVSS 3.1 · NVD

Severity by source

NVD PRIMARY
3.7 LOW
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
Analysis Generated
Jun 08, 2026 - 12:55 vuln.today
CVSS changed
May 13, 2026 - 18:22 NVD
3.7 (LOW)
CVE Published
May 12, 2026 - 15:32 nvd
UNKNOWN (no severity yet)
CVE Published
May 12, 2026 - 15:32 nvd
LOW 3.7

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 2 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (2 direct, 0 indirect)
  • 2 maven packages depend on org.apache.tomcat:tomcat-catalina (2 direct, 0 indirect)

Ecosystem-wide dependent count for version 10.1.0-M1 and other introduced versions.

DescriptionCVE.org

Observable Timing Discrepancy vulnerability when comparing AJP secret in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

AnalysisAI

Timing side-channel in Apache Tomcat's AJP secret comparison exposes the shared AJP connector secret to remote, unauthenticated attackers capable of making precise network timing measurements. The vulnerability, tracked as CWE-208 (Observable Timing Discrepancy), affects all major Tomcat branches from 7.0.0 through current releases prior to the fixed versions, and could allow an attacker to recover the AJP shared secret through repeated probing. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed AJP port 8009
Delivery
Send repeated AJP handshakes with varied secret bytes
Exploit
Measure per-byte comparison timing deltas
Execution
Statistically infer secret character by character
Persist
Use recovered secret to authenticate AJP session
Impact
Forge trusted front-end proxy requests
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the Apache Tomcat AJP connector is enabled and configured with a non-empty requiredSecret (the AJP shared secret). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The overall risk is low-to-moderate. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to the Tomcat AJP port (default 8009) sends a high volume of AJP connection attempts with systematically varied secret values, measuring response latencies to distinguish early-exit (mismatch on first byte) from late-exit comparisons. By iterating across possible characters at each position and applying statistical analysis to timing samples, the attacker progressively recovers the AJP shared secret. …
Remediation Upgrade to Apache Tomcat 11.0.22, 10.1.55, or 9.0.118, which are the vendor-confirmed fixed releases per the Apache security advisory at https://lists.apache.org/thread/2k654v5cq123npfsd1b2kk1y30owqb1m. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-43514 vulnerability details – vuln.today
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