Vulnerability-Lookup

GHSA-F93W-PCJ3-RGGC

Vulnerability from github – Published: 2026-03-05 20:57 – Updated: 2026-03-09 20:46

Summary

Pingora vulnerable to cache poisoning via insecure-by-default cache key

Details

Impact

Pingora versions prior to 0.8.0 generated cache keys using only the URI path, excluding critical factors such as the host header. This allows an attacker to poison the cache and serve cross-origin responses to users.

This vulnerability affects users of Pingora's alpha proxy caching feature who relied on the default CacheKey implementation. An attacker could exploit this for cross-tenant data leakage in multi-tenant deployments, or serve malicious content to legitimate users by poisoning shared cache entries.

Note: Cloudflare customers and Cloudflare's CDN infrastructure were not affected by this vulnerability, as Cloudflare's default cache key implementation uses multiple factors to prevent cache key poisoning and never made use of the previously provided default.

Patches

We strongly suggest users should upgrade to Pingora v.0.8.0 or higher, which removes the default CacheKey implementation.

Workarounds

Do not rely on the provided CacheKey default, and at minimum use the host / :authority and the upstream peer TLS scheme as part of building the CacheKey, as well as other factors that may apply to the deployment e.g. HTTP method.

References

See CVE-2026-2836 and the Cloudflare blog post for more details.

Credits

Disclosed responsibly by Rajat Raghav (@xclow3n) through the Cloudflare Bug Bounty Program.

Severity ?

8.4 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.7.0"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "pingora-cache"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-2836"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-05T20:57:49Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nPingora versions prior to 0.8.0 generated cache keys using only the URI path, excluding critical factors such as the host header. This allows an attacker to poison the cache and serve cross-origin responses to users.\n\nThis vulnerability affects users of Pingora\u0027s alpha proxy caching feature who relied on the default CacheKey implementation. An attacker could exploit this for cross-tenant data leakage in multi-tenant deployments, or serve malicious content to legitimate users by poisoning shared cache entries.\n\nNote: Cloudflare customers and Cloudflare\u0027s CDN infrastructure were not affected by this vulnerability, as Cloudflare\u0027s default cache key implementation uses multiple factors to prevent cache key poisoning and never made use of the previously provided default.\n\n### Patches\nWe strongly suggest users should upgrade to Pingora v.0.8.0 or higher, which removes the default CacheKey implementation.\n\n### Workarounds\nDo not rely on the provided CacheKey default, and at minimum use the host / :authority and the upstream peer TLS scheme as part of building the CacheKey, as well as other factors that may apply to the deployment e.g. HTTP method. \n\n### References\nSee [CVE-2026-2836](https://cve.org/CVERecord?id=CVE-2026-2836) and the [Cloudflare blog post](https://blog.cloudflare.com/pingora-oss-smuggling-vulnerabilities/) for more details.\n\n### Credits\nDisclosed responsibly by Rajat Raghav (@xclow3n) through the Cloudflare [Bug Bounty Program](https://www.cloudflare.com/disclosure/).",
  "id": "GHSA-f93w-pcj3-rggc",
  "modified": "2026-03-09T20:46:06Z",
  "published": "2026-03-05T20:57:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cloudflare/pingora/security/advisories/GHSA-f93w-pcj3-rggc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2836"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cloudflare/pingora"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0035.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Pingora vulnerable to cache poisoning via insecure-by-default cache key"
}

ghsa-f93w-pcj3-rggc

Vulnerability from osv_rustsec

Published

2026-03-04 12:00

Modified

2026-03-09 20:53

Summary

Cache poisoning via insecure-by-default cache key

Details

This flaw was corrected in commit 257b59ada28ed6cac039f67d0b71f414efa0ab6e by removing the insecure default cache key implementation. Users must now explicitly implement their own callback that includes appropriate factors such as Host header and origin server HTTP scheme. We strongly recommend that users upgrade to Pingora >= 0.8.0.

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "pingora-cache",
        "purl": "pkg:cargo/pingora-cache"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.8.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2026-2836",
    "GHSA-f93w-pcj3-rggc"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Pingora versions prior to 0.8.0 generated cache keys using only the URI path, excluding critical factors such as the host header. This allows an attacker to poison the cache and serve cross-origin responses to users.\n\nThis vulnerability affects users of Pingora\u0027s alpha proxy caching feature who relied on the default CacheKey implementation. An attacker could exploit this for cross-tenant data leakage in multi-tenant deployments, or serve malicious content to legitimate users by poisoning shared cache entries.\n\nThis flaw was corrected in commit 257b59ada28ed6cac039f67d0b71f414efa0ab6e by removing the insecure default cache key implementation. Users must now explicitly implement their own callback that includes appropriate factors such as Host header and origin server HTTP scheme. We strongly recommend that users upgrade to Pingora \u003e= 0.8.0.\n\nNote: Cloudflare customers and Cloudflare\u0027s CDN infrastructure were not affected by this vulnerability, as Cloudflare\u0027s default cache key implementation uses multiple factors to prevent cache key poisoning and never made use of the previously provided default.",
  "id": "RUSTSEC-2026-0035",
  "modified": "2026-03-09T20:53:55Z",
  "published": "2026-03-04T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/pingora-cache"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0035.html"
    },
    {
      "type": "WEB",
      "url": "https://blog.cloudflare.com/pingora-oss-smuggling-vulnerabilities/"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2836"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cache poisoning via insecure-by-default cache key"
}

CVE-2026-2836 (GCVE-0-2026-2836)

Vulnerability from cvelistv5 – Published: 2026-03-04 23:44 – Updated: 2026-03-06 18:24

Title

Cache poisoning via insecure-by-default cache key

Summary

A cache poisoning vulnerability has been found in the Pingora HTTP proxy framework’s default cache key construction. The issue occurs because the default HTTP cache key implementation generates cache keys using only the URI path, excluding critical factors such as the host header (authority). Operators relying on the default are vulnerable to cache poisoning, and cross-origin responses may be improperly served to users. Impact This vulnerability affects users of Pingora's alpha proxy caching feature who relied on the default CacheKey implementation. An attacker could exploit this for: * Cross-tenant data leakage: In multi-tenant deployments, poison the cache so that users from one tenant receive cached responses from another tenant * Cache poisoning attacks: Serve malicious content to legitimate users by poisoning shared cache entries Cloudflare's CDN infrastructure was not affected by this vulnerability, as Cloudflare's default cache key implementation uses multiple factors to prevent cache key poisoning and never made use of the previously provided default. Mitigation: We strongly recommend Pingora users to upgrade to Pingora v0.8.0 or higher, which removes the insecure default cache key implementation. Users must now explicitly implement their own callback that includes appropriate factors such as Host header, origin server HTTP scheme, and other attributes their cache should vary on. Pingora users on previous versions may also remove any of their default CacheKey usage and implement their own that should at minimum include the host header / authority and upstream peer’s HTTP scheme.

Severity ?

8.4 (High)


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

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

cloudflare

References

URL

Tags

https://github.com/cloudflare/pingora

Impacted products

	Vendor	Product	Version
	Cloudflare	https://github.com/cloudflare/pingora	Affected: 0 , < 0.8.0 (semver)

Credits

Rajat Raghav (xclow3n)

Show details on NVD website

JSON

To clipboard

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                "role": "CISA Coordinator",
                "timestamp": "2026-03-06T18:23:54.507163Z",
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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

GHSA-F93W-PCJ3-RGGC

Impact

Patches

Workarounds

References

Credits

ghsa-f93w-pcj3-rggc

Vulnerability from osv_rustsec

CVE-2026-2836 (GCVE-0-2026-2836)

Tags

Sightings

Nomenclature