CVE-2026-35480

Memory exhaustion via unchecked CBOR preallocation

Published Apr 7, 2026 · Updated Apr 7, 2026

Denial of service in IPLD go-ipld-prime before 0.22.0 allows local users to exhaust memory through crafted DAG-CBOR input. The DAG-CBOR decoder trusts map and list sizes in CBOR headers as preallocation hints without capping them or charging their cost to its allocation budget. A caller must decode attacker-controlled DAG-CBOR; nested schema-free or Any-typed data can turn a payload under 100 bytes into more than 9 GB of allocations and interrupt the process.

CVSS severity6.2
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in IPLD go-ipld-prime before 0.22.0 allows local users to exhaust memory through crafted DAG-CBOR input. The DAG-CBOR decoder trusts map and list sizes in CBOR headers as preallocation hints without capping them or charging their cost to its allocation budget. A caller must decode attacker-controlled DAG-CBOR; nested schema-free or Any-typed data can turn a payload under 100 bytes into more than 9 GB of allocations and interrupt the process.

The record

CVE
CVE-2026-35480
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
IPLD
Product
go-ipld-prime
Classifications
CWE-770, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.22.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

IPLD · go-ipld-primeversion=< 0.22.0

Published CVSS scores

6.2GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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