Vulnerability-Lookup

CVE-2026-35457 (GCVE-0-2026-35457)

Vulnerability from cvelistv5 – Published: 2026-04-07 14:22 – Updated: 2026-04-07 17:53

Title

libp2p-rust has unbounded rendezvous DISCOVER cookies enable remote memory exhaustion

Summary

libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, the rendezvous server stores pagination cookies without bounds. An unauthenticated peer can repeatedly issue DISCOVER requests and force unbounded memory growth. This vulnerability is fixed in 0.17.1.

Severity ?

8.2 (High)


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

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

https://github.com/libp2p/rust-libp2p/security/ad…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	libp2p	rust-libp2p	Affected: < 0.17.1

Show details on NVD website

JSON

To clipboard

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GHSA-V5HW-CV9C-RPG7

Vulnerability from github – Published: 2026-04-04 06:34 – Updated: 2026-04-07 19:59

Summary

libp2p-rendezvous: Unbounded rendezvous DISCOVER cookies enable remote memory exhaustion

Details

Summary

The rendezvous server stores pagination cookies without bounds. An unauthenticated peer can repeatedly issue DISCOVER requests and force unbounded memory growth.

Details

Pagination state is stored in:

HashMap<Cookie, HashSet<RegistrationId>>

On Message::Discover:

remote peer
→ DISCOVER
→ handle_request
→ registrations.get(...)
→ new cookie generated
→ cookie inserted into Registrations::cookies

There is no upper bound or eviction policy, so repeated DISCOVER requests grow this map indefinitely.

PoC

A reproduction test and minimal harness will be provided in a private fork in a follow-up comment.

Impact

Remote state amplification leading to memory exhaustion.

Properties:

etwork reachable
no authentication required
low attack complexity
protocol-compliant traffic

Impacts rendezvous nodes exposed to untrusted peers.

Possible Fixes

Global cap + eviction

Bound cookie storage (MAX_COOKIES_TRACKED) with FIFO/expiry aware eviction.
Tradeoff: attacker can churn cookies and evict legitimate pagination state.

Stateless cookies

Encode pagination state in authenticated cookies instead of storing server-side state.
Tradeoff: more complex implementation.

Rate limiting / per-peer quotas

Limit cookie creation per peer.
Tradeoff: requires peer tracking.

Severity ?

8.2 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "libp2p-rendezvous"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.17.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35457"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T06:34:29Z",
    "nvd_published_at": "2026-04-07T15:17:43Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nThe rendezvous server stores pagination cookies without bounds. An unauthenticated peer can repeatedly issue `DISCOVER` requests and force unbounded memory growth.\n\n### Details\n\nPagination state is stored in:\n\n```rs\nHashMap\u003cCookie, HashSet\u003cRegistrationId\u003e\u003e\n```\n\nOn `Message::Discover`:\n\n```\nremote peer\n\u2192 DISCOVER\n\u2192 handle_request\n\u2192 registrations.get(...)\n\u2192 new cookie generated\n\u2192 cookie inserted into Registrations::cookies\n```\n\nThere is **no upper bound or eviction policy**, so repeated DISCOVER requests grow this map indefinitely.\n\n\n### PoC\nA reproduction test and minimal harness will be provided in a private fork in a follow-up comment.\n\n### Impact\n\n**Remote state amplification leading to memory exhaustion.**\n\n\nProperties:\n\n- etwork reachable\n- no authentication required\n- low attack complexity\n- protocol-compliant traffic\n\nImpacts rendezvous nodes exposed to untrusted peers.\n---\n\n### Possible Fixes\n\n1. **Global cap + eviction**\n\nBound cookie storage (`MAX_COOKIES_TRACKED`) with FIFO/expiry aware eviction.  \nTradeoff: attacker can churn cookies and evict legitimate pagination state.\n\n2. **Stateless cookies**\n\nEncode pagination state in authenticated cookies instead of storing server-side state.  \nTradeoff: more complex implementation.\n\n3. **Rate limiting / per-peer quotas**\n\nLimit cookie creation per peer.  \nTradeoff: requires peer tracking.",
  "id": "GHSA-v5hw-cv9c-rpg7",
  "modified": "2026-04-07T19:59:51Z",
  "published": "2026-04-04T06:34:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-v5hw-cv9c-rpg7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35457"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/libp2p/rust-libp2p"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libp2p-rendezvous: Unbounded rendezvous DISCOVER cookies enable remote memory exhaustion"
}

FKIE_CVE-2026-35457

Vulnerability from fkie_nvd - Published: 2026-04-07 15:17 - Updated: 2026-04-08 21:27

Severity ?

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-v5hw-cv9c-rpg7

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, the rendezvous server stores pagination cookies without bounds. An unauthenticated peer can repeatedly issue DISCOVER requests and force unbounded memory growth. This vulnerability is fixed in 0.17.1."
    }
  ],
  "id": "CVE-2026-35457",
  "lastModified": "2026-04-08T21:27:15.610",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
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        "impactScore": 4.2,
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        "type": "Secondary"
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      "url": "https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-v5hw-cv9c-rpg7"
    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
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          "lang": "en",
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      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-35457 (GCVE-0-2026-35457)

GHSA-V5HW-CV9C-RPG7

Summary

Details

PoC

Impact

Impacts rendezvous nodes exposed to untrusted peers.

Possible Fixes

FKIE_CVE-2026-35457

Tags

Sightings

Nomenclature