Klever-Go MultiDataInterceptor has remote OOM via crafted compressed P2P payload

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.6 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS

• CVE-2026-44697: 0.40% estimated exploitation activity in the next 30 days; percentile 33.87 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A remote, unauthenticated denial-of-service vulnerability in Batch.Decompress (data/batch/batch.go) allows any peer that participates in a topic served by MultiDataInterceptor to allocate multi-gigabyte heaps on the receiving node from a sub-50 KiB gossip payload. A single packet is sufficient to OOM-kill a validator with conventional memory provisioning. Fleet-wide application affects chain liveness. The vulnerability was identified during an internal security review of core/process/interceptors/multiDataInterceptor.go at commit 405d01b0abbf0d3e73b4a990bd7394a01f200dc2. It is distinct from, and substantially more severe than, the throttler-slot-leak vulnerability disclosed in GHSA-74m6-4hjp-7226. Both reports cover adjacent code in the same call path; the patches must land together in one release (rc2 superseding rc1). Two additional, lower-severity hardening issues affecting the same code path are documented in this report and remediated by the same patch. They are not…

Published by the source

13 May 2026, 01:36 UTC

Last modified by the source

29 May 2026, 21:57 UTC

Source last checked

26 Oct 2026, 15:23 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-87m7-qffr-542v

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# Patch Next advisory brief: CVE-2026-44697

Advisory: Klever-Go MultiDataInterceptor has remote OOM via crafted compressed P2P payload
IDs: CVE-2026-44697, GHSA-87m7-qffr-542v
Record: https://patchnext.com/advisories/cve-2026-44697 (revision 1, source checked 26 Oct 2026, 15:23 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/klever-io/klever-go: affected <= 1.7.16

## Suggested inspection (read-only)
- Go github.com/klever-io/klever-go: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/klever-io/klever-go.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-87m7-qffr-542v (GitHub-reviewed advisory GHSA-87m7-qffr-542v lists affected ranges: Go github.com/klever-io/klever-go >=0 <=1.7.16)

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