# CVE-2024-32976: Envoy can enter an endless loop while decompressing Brotli data with extra input

Status: published. Published: 2024-06-04. Updated: 2026-11-05.

Envoy is a cloud-native, open source edge and service proxy. Envoyproxy with a Brotli filter can get into an endless loop during decompression of Brotli data with extra input.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- envoyproxy / envoy: >= 1.30.0, <= 1.30.1 (affected); >= 1.29.0, <= 1.29.4 (affected); >= 1.28.0, <= 1.28.3 (affected); > 1.18.0, <= 1.27.5 (affected). Source: CNA: GitHub_M
- envoyproxy / envoy: ≥ 1.30.0; ≤ 1.30.1 (affected, custom); ≥ 1.29.0; ≤ 1.29.4 (affected, custom); ≥ 1.28.0; ≤ 1.28.3 (affected, custom); ≥ 1.18.0; ≤ 1.27.5 (affected, custom). Source: ADP: CISA-ADP

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "1.27.6",
            "versionStartIncluding": "1.18.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "1.28.4",
            "versionStartIncluding": "1.28.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "1.29.5",
            "versionStartIncluding": "1.29.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "1.30.2",
            "versionStartIncluding": "1.30.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: nvd@nist.gov

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.67% as of 2026-11-05; percentile 52.30%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-835

## Exploit evidence

- exploit: https://github.com/envoyproxy/envoy/security/advisories/GHSA-7wp5-c2vq-4f8m (security-advisories@github.com)
- exploit: https://github.com/envoyproxy/envoy/security/advisories/GHSA-7wp5-c2vq-4f8m (af854a3a-2127-422b-91ae-364da2661108)

## References

- https://github.com/envoyproxy/envoy/security/advisories/GHSA-7wp5-c2vq-4f8m (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/envoyproxy/envoy/security/advisories/GHSA-7wp5-c2vq-4f8m (ADP: CVE; x_refsource_CONFIRM, x_transferred)

- https://github.com/envoyproxy/envoy/security/advisories/GHSA-7wp5-c2vq-4f8m (security-advisories@github.com; Exploit, Third Party Advisory)

- https://github.com/envoyproxy/envoy/security/advisories/GHSA-7wp5-c2vq-4f8m (af854a3a-2127-422b-91ae-364da2661108; Exploit, Third Party Advisory)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2024-32976; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-32976; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-32976; retrieved 2026-11-05; source updated Not reported

Revision: 87c9e5e652744671eee8fdaf8cbb50fafe93c46835a3ea2c73180438ec8cc706

Canonical: https://y2.dev/cve/CVE-2024-32976

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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