CVE-2026-72678
published 2026-08-13CVE-2026-72678: Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An…
PriorityP338medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.47%
38.9th percentile
Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| elastic | elasticsearch | — | — |
| elastic | elasticsearch | >= 8.19.0 < 8.19.20 | 8.19.20 |
| elastic | elasticsearch | 8.19.0 – 8.19.19 | — |
| elastic | elasticsearch | >= 9.4.0 < 9.4.5 | 9.4.5 |
| elastic | elasticsearch | 9.4.0 – 9.4.4 | — |
| elastic | elasticsearch | >= 9.5.0 < 9.5.1 | 9.5.1 |
| quay | quay-rhel8 | — | — |
| quay | quay-rhel9 | — | — |
| rhoai | odh-feature-server-rhel9 | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vendor_redhat6.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
elasticsearch: Elasticsearch: Denial of Service via excessive memory allocation
vendor_redhat·2026-08-13·CVSS 6.5
CVE-2026-72678 [MEDIUM] CWE-770 elasticsearch: Elasticsearch: Denial of Service via excessive memory allocation
elasticsearch: Elasticsearch: Denial of Service via excessive memory allocation
A flaw was found in Elasticsearch. An authenticated user with read privileges can submit a crafted request that causes the node to attempt an excessively large memory allocation due to unvalidated user input. This memory exhaustion leads to a fatal error, terminating the Elasticsearch node process and causing a Denial of Service (DoS) for the affected node. A single request is sufficient to trigger this issue.
Statement: An unvalidated allocation flaw exists in Elasticsearch's API request processing mechanisms. When handling user-supplied size parameters during data structure initialization, Elasticsearch fails to bound memory allocation requests. An authenticated remote user with read-only privileges can sub
GHSA
Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure.
ghsa_unreviewed·2026-08-13
CVE-2026-72678 [MEDIUM] CWE-789 Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure.
Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node.
No detection rules found.
No public exploits indexed.
2026-08-13
Published