CVE-2026-104429

Zebra before 6.0.0-rc.0 Per-Peer Mempool Admission Bypass via P2P tx Messages

MEDIUM
5.3
CVSS Score
Published: October 2, 2026 at 11:38 AM UTC
Updated: October 2, 2026 at 05:59 PM UTC
2 products affected across 2 vendorsZebraZebra

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Zebra (zebrad) 5.0.0 before 6.0.0-rc.0 does not apply its per-peer mempool admission cap to transactions received as direct P2P tx messages, because these are queued without the sending peer recorded as their source. A remote inbound peer can push many unique transactions to occupy a disproportionate share of mempool admission slots, crowding out honest peers' transaction relay.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

95%
v < 6.0.0-rc.0
Affected range stops below 6.0.0-rc.0, so it looks safe — our inference, not a vendor statement
v < 6.0.0-rc.0
Vendor states this is fixed in 6.0.0-rc.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-770

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