Vulnerability-Lookup

CVE-2026-69201 (GCVE-0-2026-69201)

Vulnerability from cvelistv5 – Published: 2026-09-15 19:02 – Updated: 2026-09-15 19:21

Title

Http4s: ResourceService and Webjar Service path escape via percent-encoded separators

Summary

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, ResourceService and WebjarService decode each URL path segment but reject only segments exactly equal to an empty string, a dot, or two dots. A request containing percent-encoded slash or backslash separators can turn an accepted segment into a parent-directory traversal after decoding, allowing access to classpath or WebJar resources outside the configured base when a directory-backed classpath is served and the backend preserves the encoded separator. The patch rejects decoded segments containing slash or backslash in ResourceService and WebjarService, and applies the same guard to the non-exploitable FileService for consistency. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 19:21 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/http4s/http4s/security/advisor…	x_refsource_CONFIRM
https://github.com/http4s/http4s/commit/bcd99cdc1…	x_refsource_MISC
https://github.com/http4s/http4s/releases/tag/v0.23.35	x_refsource_MISC
https://github.com/http4s/http4s/releases/tag/v1.…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
http4s	http4s	Affected: < 0.23.35 Affected: >= 1.0.0-M1, < 1.0.0-M47	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-69201

Vulnerability from fkie_nvd - Published: 2026-09-15 19:17 - Updated: 2026-09-16 20:38

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/http4s/http4s/commit/bcd99cdc1342ef58a0f132acb814af06a668a8d3
	security-advisories@github.com	https://github.com/http4s/http4s/releases/tag/v0.23.35
	security-advisories@github.com	https://github.com/http4s/http4s/releases/tag/v1.0.0-M47
	security-advisories@github.com	https://github.com/http4s/http4s/security/advisories/GHSA-crq5-92j2-j7wv

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
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      "affectedData": [
        {
          "product": "http4s",
          "vendor": "http4s",
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    }
  ],
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  "lastModified": "2026-09-16T20:38:04.943",
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GHSA-CRQ5-92J2-J7WV

Vulnerability from github – Published: 2026-09-15 20:01 – Updated: 2026-09-15 20:01

Summary

Http4s: ResourceService and Webjar Service path escape via percent-encoded separators

Details

The static content handlers ResourceService and WebjarService URL decode each path segment and then reject only segments that are exactly "", ".", or "..". A percent-encoded separator (%2F) lets an attacker smuggle a ../ segment past that filter and escape the configured base, reading resources that should not be public.

On Windows, a similar attack exists with (%5C).

Impact

Disclosure of classpath or webjar resources outside the configured base.

Preconditions

Application uses ResourceService (with a non-root base path) or WebjarService
At least one classpath entry is served from a directory (e.g. sbt run, exploded .war)
Backend forwards %2F/%5C without normalizing (e.g., Ember, Blaze)

Fixes

The patch rejects any decoded path segment containing / (%2F) or \ (%5C) with a 400 Bad Request in ResourceService and WebjarService.

FileService was not exploitable, but the same guards are applied for consistency and to remove its reliance on path normalization.

Workarounds

Deploy as a fat jar, with no filesystem directories on the classpath.
Front the service with a proxy that rejects/normalizes %2F and %5C in the request path.

Severity

5.9 (Medium)


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

Show details on source website

JSON

To clipboard

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      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.23.34"
      },
      "package": {
        "ecosystem": "Maven",
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      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.35"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0-M46"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-server_3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0-M1"
            },
            {
              "fixed": "1.0.0-M47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0-M46"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.http4s:http4s-server_2.13"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0-M1"
            },
            {
              "fixed": "1.0.0-M47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-69201"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-15T20:01:12Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "The static content handlers `ResourceService` and `WebjarService` URL decode each path segment and then reject only segments that are exactly `\"\"`, `\".\"`, or `\"..\"`.  A percent-encoded separator (`%2F`) lets an attacker smuggle a `../` segment past that filter and escape the configured base, reading resources that should not be public.\n\nOn Windows, a similar attack exists with (`%5C`).\n\n## Impact\n\nDisclosure of classpath or webjar resources outside the configured base.\n\n## Preconditions\n\n- Application uses `ResourceService` (with a non-root base path) or `WebjarService`\n- At least one classpath entry is served from a directory (e.g. `sbt run`, exploded .war)\n- Backend forwards `%2F`/`%5C` without normalizing (e.g., Ember, Blaze)\n\n## Fixes\n\nThe patch rejects any decoded path segment containing `/` (`%2F`) or `\\` (`%5C`) with a `400 Bad Request` in `ResourceService` and `WebjarService`.\n\n`FileService` was not exploitable, but the same guards are applied for consistency and to remove its reliance on path normalization.\n\n## Workarounds\n\n- Deploy as a fat jar, with no filesystem directories on the classpath.\n- Front the service with a proxy that rejects/normalizes `%2F` and `%5C` in the request path.",
  "id": "GHSA-crq5-92j2-j7wv",
  "modified": "2026-09-15T20:01:13Z",
  "published": "2026-09-15T20:01:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/security/advisories/GHSA-crq5-92j2-j7wv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/commit/bcd99cdc1342ef58a0f132acb814af06a668a8d3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/http4s/http4s"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v0.23.35"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M47"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Http4s: ResourceService and Webjar Service path escape via percent-encoded separators"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-69201 (GCVE-0-2026-69201)

FKIE_CVE-2026-69201

GHSA-CRQ5-92J2-J7WV

Impact

Preconditions

Fixes

Workarounds

Tags

Sightings

Nomenclature

Related by attack behaviour