Answer in brief
CVE-2024-3653 records a Medium severity (CVSS 5.3) vulnerability in Undertow: learningpushhandler can lead to remote memory dos attacks. The current sources do not mark it as known exploited. The current feed maps undertow (generic), Red Hat/undertow (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps undertow (generic), Red Hat/undertow (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| undertowgeneric | >=0 <=2.3.14.Final | Not reported |
| Red Hat/undertowgeneric | * | Not reported |
Published upstream
Jul 8, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.
Quoted source text, attributed separately from HOL analysis.