Vulnerability-Lookup

CVE-2026-102601 (GCVE-0-2026-102601)

Vulnerability from cvelistv5 – Published: 2026-09-29 15:26 – Updated: 2026-09-29 16:02

Title

Flysystem: WhitespacePathNormalizer's control-character (CorruptedPathDetected) check is bypassed by malformed UTF-8 in the path, affecting every adapter

Summary

Flysystem is an open source file storage library for PHP. Prior to 3.35.3, the default WhitespacePathNormalizer in src/WhitespacePathNormalizer.php used by Filesystem across adapters calls preg_match with the u modifier and treats both false and 0 as falsy. A path containing malformed UTF-8 causes PCRE to return false, so paths that also contain control characters bypass CorruptedPathDetected::forPath() in normalizePath(). Filesystem::write() can store such names and Filesystem::listContents() can return the raw ANSI escape sequences, allowing hidden or spoofed terminal file listings when an administrator displays them. This issue is fixed in version 3.35.3.

Severity

3.5 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-29 16:01 UTC

CWE

CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/thephpleague/flysystem/securit…	x_refsource_CONFIRM
https://github.com/thephpleague/flysystem/commit/…	x_refsource_MISC
https://github.com/thephpleague/flysystem/release…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
thephpleague	flysystem	Affected: < 3.35.3	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-102601",
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                "timestamp": "2026-09-29T16:01:15.275868Z",
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FKIE_CVE-2026-102601

Vulnerability from fkie_nvd - Published: 2026-09-29 16:17 - Updated: 2026-09-29 16:17

Severity

3.5 (Low) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77
	security-advisories@github.com	https://github.com/thephpleague/flysystem/releases/tag/3.35.3
	security-advisories@github.com	https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "flysystem",
          "vendor": "thephpleague",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.35.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Flysystem is an open source file storage library for PHP. Prior to 3.35.3, the default WhitespacePathNormalizer in src/WhitespacePathNormalizer.php used by Filesystem across adapters calls preg_match with the u modifier and treats both false and 0 as falsy. A path containing malformed UTF-8 causes PCRE to return false, so paths that also contain control characters bypass CorruptedPathDetected::forPath() in normalizePath(). Filesystem::write() can store such names and Filesystem::listContents() can return the raw ANSI escape sequences, allowing hidden or spoofed terminal file listings when an administrator displays them. This issue is fixed in version 3.35.3."
    }
  ],
  "id": "CVE-2026-102601",
  "lastModified": "2026-09-29T16:17:06.343",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.5,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.1,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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  "references": [
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      "source": "security-advisories@github.com",
      "url": "https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77"
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      "url": "https://github.com/thephpleague/flysystem/releases/tag/3.35.3"
    },
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      "url": "https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr"
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}

GHSA-CXF4-7MRP-VVPR

Vulnerability from github – Published: 2026-09-29 18:10 – Updated: 2026-09-29 18:10

Summary

Flysystem: WhitespacePathNormalizer's control-character (CorruptedPathDetected) check is bypassed by malformed UTF-8 in the path, affecting every adapter

Details

Related public issue (context, not a duplicate)

Closed issue #1429 ("Handle non-UTF-8 paths", 2024-03-24) raised exactly this general concern and even suggested detection via preg_match('//u', $path) !== 1 -- note the reporter's suggested check explicitly compares !== 1, which would correctly treat PCRE's false return as "reject." The maintainer's reply pointed to the PathNormalizer interface as the place to implement this. The control-character check that ended up shipping in WhitespacePathNormalizer (if (preg_match('#\p{C}+#u', $unixPath))) addresses the general concern but does not use the !== 1-style comparison the original issue suggested -- it uses a bare truthy check, which is exactly the gap this report demonstrates. So this is not a duplicate of #1429; it's a concrete bypass surviving in the fix that issue's concern led to.

Vulnerability Details

File: src/WhitespacePathNormalizer.php, lines 22-28 (normalizePath()) -- the default PathNormalizer used by Filesystem for every adapter (Local, FTP, SFTP, S3, AsyncAwsS3, Azure, GCS, ZipArchive, GridFS, InMemory) unless the application supplies a custom one.

Root Cause

public function normalizePath(string $path): string
{
    $unixPath = str_replace('\\', '/', $path);

    if (preg_match('#\p{C}+#u', $unixPath)) {
        throw CorruptedPathDetected::forPath($path);
    }
    ...

preg_match() returns false (a PHP engine error) rather than 0 when the subject string is not valid UTF-8 and the pattern uses the /u modifier -- PCRE can't even attempt the match. false and 0 are both falsy in PHP, and if (preg_match(...)) does not distinguish them. So a path containing any single invalid UTF-8 byte anywhere in the string makes preg_match() fail with a "Malformed UTF-8 characters" engine error, the if evaluates false, and CorruptedPathDetected is silently not thrown -- even when the same string also contains literal control characters this exact check exists to catch.

the identical payload IS correctly rejected once it's valid UTF-8:

$n->normalizePath("foo\x1bbar");         // valid UTF-8, contains ESC -> throws CorruptedPathDetected (correct)
$n->normalizePath("foo\x80\x1bbar");    // 0x80 = invalid lone UTF-8 continuation byte -> NOT thrown (bypass)

The path-traversal protection is unaffected -- it's exact byte-string comparison on /-delimited segments, independent of UTF-8 validity:

$n->normalizePath("\x80/../../etc/passwd");   // still throws PathTraversalDetected

Recommended Fix

public function normalizePath(string $path): string
{
    $unixPath = str_replace('\\', '/', $path);
    $matched = preg_match('#\p{C}+#u', $unixPath);

    if ($matched !== 0) {
        // $matched === false means malformed UTF-8 -- must also be treated as corrupted,
        // not silently allowed through.
        throw CorruptedPathDetected::forPath($path);
    }
    ...

Verification

Dynamically confirmed on league/flysystem HEAD 6837e1d / tag 3.35.2, PHP 8.4.22 CLI, end-to-end through LocalFilesystemAdapter: `` [1] write() succeeded -- normalizer did NOT reject the path. [2] Actual bytes on disk: ...801b5b386d6e6f726d616c2d6c6f6f6b696e672d66696c652e7478741b5b306d... [3] Filesystem::listContents() path contains raw ESC (0x1b): YES [4] Raw terminal output (viacat -v`): M-^@^[[8mnormal-looking-file.txt^[[0m^[[2K^[[1Aurgent-invoice.pdf

Severity

3.5 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.35.2"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "league/flysystem"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.35.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-102601"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-150"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-29T18:10:14Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "## Related public issue (context, not a duplicate)\n\nClosed issue #1429 (\"Handle non-UTF-8 paths\", 2024-03-24) raised exactly this general concern and\neven suggested detection via `preg_match(\u0027//u\u0027, $path) !== 1` -- note the reporter\u0027s suggested check\nexplicitly compares `!== 1`, which *would* correctly treat PCRE\u0027s `false` return as \"reject.\" The\nmaintainer\u0027s reply pointed to the `PathNormalizer` interface as the place to implement this. The\ncontrol-character check that ended up shipping in `WhitespacePathNormalizer`\n(`if (preg_match(\u0027#\\p{C}+#u\u0027, $unixPath))`) addresses the general concern but does **not** use the\n`!== 1`-style comparison the original issue suggested -- it uses a bare truthy check, which is exactly\nthe gap this report demonstrates. So this is not a duplicate of #1429; it\u0027s a concrete bypass\nsurviving in the fix that issue\u0027s concern led to.\n\n## Vulnerability Details\n\n**File**: `src/WhitespacePathNormalizer.php`, lines 22-28 (`normalizePath()`) -- the **default**\n`PathNormalizer` used by `Filesystem` for every adapter (Local, FTP, SFTP, S3, AsyncAwsS3, Azure, GCS,\nZipArchive, GridFS, InMemory) unless the application supplies a custom one.\n\n### Root Cause\n\n```php\npublic function normalizePath(string $path): string\n{\n    $unixPath = str_replace(\u0027\\\\\u0027, \u0027/\u0027, $path);\n\n    if (preg_match(\u0027#\\p{C}+#u\u0027, $unixPath)) {\n        throw CorruptedPathDetected::forPath($path);\n    }\n    ...\n```\n\n`preg_match()` returns `false` (a PHP engine error) rather than `0` when the subject string is not\nvalid UTF-8 and the pattern uses the `/u` modifier -- PCRE can\u0027t even attempt the match. `false` and\n`0` are both falsy in PHP, and `if (preg_match(...))` does not distinguish them. So a path containing\n**any single invalid UTF-8 byte anywhere in the string** makes `preg_match()` fail with a \"Malformed\nUTF-8 characters\" engine error, the `if` evaluates false, and `CorruptedPathDetected` is silently **not**\nthrown -- even when the same string also contains literal control characters this exact check exists\nto catch.\n\nthe identical payload IS correctly rejected once it\u0027s valid UTF-8:\n```php\n$n-\u003enormalizePath(\"foo\\x1bbar\");         // valid UTF-8, contains ESC -\u003e throws CorruptedPathDetected (correct)\n$n-\u003enormalizePath(\"foo\\x80\\x1bbar\");    // 0x80 = invalid lone UTF-8 continuation byte -\u003e NOT thrown (bypass)\n```\n\nThe path-traversal protection is **unaffected** -- it\u0027s exact byte-string comparison on\n`/`-delimited segments, independent of UTF-8 validity:\n```php\n$n-\u003enormalizePath(\"\\x80/../../etc/passwd\");   // still throws PathTraversalDetected\n```\n\n### Recommended Fix\n```php\npublic function normalizePath(string $path): string\n{\n    $unixPath = str_replace(\u0027\\\\\u0027, \u0027/\u0027, $path);\n    $matched = preg_match(\u0027#\\p{C}+#u\u0027, $unixPath);\n\n    if ($matched !== 0) {\n        // $matched === false means malformed UTF-8 -- must also be treated as corrupted,\n        // not silently allowed through.\n        throw CorruptedPathDetected::forPath($path);\n    }\n    ...\n```\n\n### Verification\nDynamically confirmed on `league/flysystem` HEAD `6837e1d` / tag `3.35.2`, PHP 8.4.22 CLI, end-to-end\nthrough `LocalFilesystemAdapter`:\n```\n[1] write() succeeded -- normalizer did NOT reject the path.\n[2] Actual bytes on disk: ...801b5b386d6e6f726d616c2d6c6f6f6b696e672d66696c652e7478741b5b306d...\n[3] Filesystem::listContents() path contains raw ESC (0x1b): YES\n[4] Raw terminal output (via `cat -v`): M-^@^[[8mnormal-looking-file.txt^[[0m^[[2K^[[1Aurgent-invoice.pdf",
  "id": "GHSA-cxf4-7mrp-vvpr",
  "modified": "2026-09-29T18:10:14Z",
  "published": "2026-09-29T18:10:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/thephpleague/flysystem/security/advisories/GHSA-cxf4-7mrp-vvpr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/thephpleague/flysystem/commit/ef4a9a557d769b5d472c403125716706a0d9cc77"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/thephpleague/flysystem"
    },
    {
      "type": "WEB",
      "url": "https://github.com/thephpleague/flysystem/releases/tag/3.35.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Flysystem: WhitespacePathNormalizer\u0027s control-character (CorruptedPathDetected) check is bypassed by malformed UTF-8 in the path, affecting every adapter"
}

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.

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-2026-102601 (GCVE-0-2026-102601)

FKIE_CVE-2026-102601

GHSA-CXF4-7MRP-VVPR

Related public issue (context, not a duplicate)

Vulnerability Details

Root Cause

Recommended Fix

Verification

Tags

Sightings

Nomenclature

Related by attack behaviour