---
cve: "CVE-2026-111101"
severity: "HIGH"
cvss: 8.7
epss: ""
vendor: "mtrudel"
kev: false
exploited: false
published: "2026-10-26 13:31:48"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-11-01T20:41:51+01:00"
---

# CVE-2026-111101

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/1.1 chunked body reader of mtrudel bandit allows an unauthenticated remote attacker to exhaust server memory and CPU via a request body made of many 1-byte chunks.

The chunked reader in lib/bandit/http1/socket.ex keeps every chunk as its own list cell and binary term until IO.iodata_to_binary/1 joins them, and nothing limits the number of chunks. The :length option of read_body/2 counts only data bytes, so tiny chunks cost far more memory than their payload: 48 MB of 1-byte chunks grew one handler process to about 500 MB and took about 6 s of CPU. The route does not need to read the body, because on keep-alive connections ensure_completed/1 drains unread bodies through the same reader.

This issue affects bandit: from 0.1.0 before 1.14.0.

## CNA-Record (Kanon, cvelistV5)

- CNA: **EEF**
- State: PUBLISHED
- Stand: 2026-10-26 15:35:51
- CNA-CVSS: **8.7** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-770** — Allocation of Resources Without Limits or Throttling
  The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

## Angriffsmuster (CAPEC)

- [CAPEC-125 — Flooding](https://capec.mitre.org/data/definitions/125.html) _(Severity: Medium)_
- [CAPEC-130 — Excessive Allocation](https://capec.mitre.org/data/definitions/130.html) _(Severity: Medium)_
- [CAPEC-147 — XML Ping of the Death](https://capec.mitre.org/data/definitions/147.html) _(Severity: Medium)_
- [CAPEC-197 — Exponential Data Expansion](https://capec.mitre.org/data/definitions/197.html) _(Severity: Medium)_
- [CAPEC-229 — Serialized Data Parameter Blowup](https://capec.mitre.org/data/definitions/229.html) _(Severity: High)_
- [CAPEC-230 — Serialized Data with Nested Payloads](https://capec.mitre.org/data/definitions/230.html) _(Severity: High)_
- [CAPEC-231 — Oversized Serialized Data Payloads](https://capec.mitre.org/data/definitions/231.html) _(Severity: High)_
- [CAPEC-469 — HTTP DoS](https://capec.mitre.org/data/definitions/469.html) _(Severity: Low)_

## ATT&CK-Techniken

- [T1498.001 — Network Denial of Service: Direct Network Flood](https://attack.mitre.org/techniques/T1498/001/)
- [T1499 — Endpoint Denial of Service](https://attack.mitre.org/techniques/T1499/)
- [T1499.003 — Endpoint Denial of Service:Application Exhaustion Flood](https://attack.mitre.org/techniques/T1499/003/)
- [T1499.002 — Endpoint Denial of Service: Service Exhaustion Flood](https://attack.mitre.org/techniques/T1499/002/)

## Patch verfügbar (OSV)

- 220b9dfd27f9a21305be2afc75cbe585ddc24e7a (Commit)
- 220b9dfd27f9a21305be2afc75cbe585ddc24e7a (Commit)

## Referenzen

- <https://github.com/mtrudel/bandit/security/advisories/GHSA-jwh3-j29h-qfmw>
- <https://cna.erlef.org/cves/CVE-2026-111101.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-111101>
- <https://github.com/mtrudel/bandit/commit/7201270c34b90f6c9e15c0386c2bb802c0c72ab4>
- <https://github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-111101/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_