CVE-2026-43514: Apache Tomcat: AJP secret compared in non-constant time
Telemetry drift only. No threshold crossed and no authority ruling changed.
CVE record, CISA KEV and EPSS as of 2026-10-18.
CVEs like this one computed, by meaning
What to do now held facts and links
- Upgrade to the fixed version for your release line, or later: tomcat 10.1.55; tomcat 11.0.22; tomcat 9.0.118 upper bounds of the CVE record's affected ranges
- Later advisories still cover the fixes above and name higher ones: tomcat 10.1.56 (CVE-2026-55276), 10.1.56 (CVE-2026-55955), 10.1.56 (CVE-2026-55956), 10.1.57 (CVE-2026-59083), 10.1.57 (CVE-2026-59084), 10.1.58 (CVE-2026-65182), 10.1.58 (CVE-2026-65183), 10.1.58 (CVE-2026-65637), 10.1.58 (CVE-2026-65905), 10.1.58 (CVE-2026-65927), 10.1.58 (CVE-2026-66299), 10.1.58 (CVE-2026-66422), 10.1.58 (CVE-2026-68525), 10.1.58 (CVE-2026-68569), 10.1.58 (CVE-2026-68763), 10.1.58 (CVE-2026-73180), 10.1.60 (CVE-2026-73581), 10.1.60 (CVE-2026-75973), 10.1.60 (CVE-2026-76183), 10.1.60 (CVE-2026-77756), 10.1.60 (CVE-2026-77762), 10.1.60 (CVE-2026-77791), 10.1.60 (CVE-2026-78383), 10.1.60 (CVE-2026-78437), 10.1.60 (CVE-2026-79677), 10.1.60 (CVE-2026-86248), 10.1.60 (CVE-2026-86350), 10.1.60 (CVE-2026-87022) OSV advisories
- Record your decision, dated and frozen with today's evidence: patch by a date · mitigated by a compensating control · deferred · accepted the risk · not affected
- Check your version against the ranges this record publishes.
What it is stated by the CNA
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.
- weakness
- CWE-208 Observable Timing Discrepancy
- affected
- Apache Software Foundation Apache Tomcat
- published ranges
- apache tomcat >= 7.0.0 <= 7.0.109; apache tomcat >= 8.5.0 <= 8.5.100; apache tomcat >= 9.0.0 < 9.0.118; apache tomcat >= 10.1.0 < 10.1.55; and 1 more on the CVE page
- first unaffected version, by branch
- tomcat 10.1.55; tomcat 11.0.22; tomcat 9.0.118
- fixed by package (from OSV advisories)
- tomcat (Bitnami): 10.1.55; 11.0.22; 9.0.118 BIT-tomcat-2026-43514org.apache.tomcat.embed:tomcat-embed-core (Maven): 9.0.118; 10.1.55; 11.0.22 GHSA-9m89-8frq-c98corg.apache.tomcat:tomcat (Maven): 9.0.118; 10.1.55; 11.0.22 GHSA-9m89-8frq-c98corg.apache.tomcat:tomcat-catalina (Maven): 9.0.118; 10.1.55; 11.0.22 GHSA-9m89-8frq-c98c
- later fixes (from OSV advisories)
- tomcat 10.1.55 is inside a range CVE-2026-55276 (BIT-tomcat-2026-55276) lists as affected. That advisory is fixed in 10.1.56.tomcat 10.1.55 is inside a range CVE-2026-55955 (BIT-tomcat-2026-55955) lists as affected. That advisory is fixed in 10.1.56.tomcat 10.1.55 is inside a range CVE-2026-55956 (BIT-tomcat-2026-55956) lists as affected. That advisory is fixed in 10.1.56.tomcat 10.1.55 is inside a range CVE-2026-59083 (BIT-tomcat-2026-59083) lists as affected. That advisory is fixed in 10.1.57.tomcat 10.1.55 is inside a range CVE-2026-59084 (BIT-tomcat-2026-59084) lists as affected. That advisory is fixed in 10.1.57.tomcat 10.1.55 is inside a range CVE-2026-65182 (BIT-tomcat-2026-65182) lists as affected. That advisory is fixed in 10.1.58.
- assigned by
- apache
- published
- 2026-05-12
check us lists.apache.org
Exploit code held, dated
- exploit code
- None held in the PoC-in-GitHub feed. A public repository changes this brief.
What moved held, dated
| date | EPSS | event |
|---|---|---|
| 13 May 2026 | 0.00018 | |
| 14 May 2026 | 0.00028 | |
| 15 May 2026 | 0.00076 | |
| 18 May 2026 | 0.001 | |
| 13 Jun 2026 | 0.00099 | |
| 15 Jun 2026 | 0.00365 | scoring model v2026.06.15 |
| 23 Jun 2026 | 0.00352 | |
| 28 Sep 2026 | 0.00531 |
8 observations held. A step marked with a scoring model moved because the measurement was replaced, not because the vulnerability changed.
Outside the record researched, cited
This section reads the record's references and adds cited findings from outside it. It needs an account. Everything above is held facts and is complete without it.
What would change this brief held, dated
- CISA KEV
- Not listed in the catalogue we hold. A listing changes this brief.
- exploit probability
- 0.01 on 2026-09-28 (FIRST's EPSS, a probability and not evidence of exploitation). Next band line: 10% (0.10). Crossing a line changes this brief.
- fix
- Held: tomcat 10.1.55; tomcat 11.0.22; tomcat 9.0.118. A newer fix from the CNA or OSV changes this brief.
How to check this
Every value above is held with two dates: when it was true upstream (as_of) and when we recorded it (tx_from). Re-derive the exploit probability as it stood on any date:
SELECT value, source, source_version, as_of, tx_from
FROM volatile_valid_as_of('CVE-2026-43514', '2026-11-01T23:59:59.999999Z', now());