Vulnerability-Lookup

CVE-2026-8612 (GCVE-0-2026-8612)

Vulnerability from cvelistv5 – Published: 2026-05-15 01:11 – Updated: 2026-05-15 14:31

Title

WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable on-disk cache, enabling local response forgery and code execution

Summary

WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable on-disk cache, enabling local response forgery and code execution. With no explicit cache backend, WWW::Mechanize::Cached constructs a default Cache::FileCache under /tmp/FileCache without overriding the backend's documented directory_umask of 000, so the cache root and its subdirectories are created mode 0777 with no sticky bit. Cache entries are named by sha1_hex of the request and read back through Storable::thaw on the next cache hit. A local attacker with write access to the cache tree can replace a victim's cache entry for a known URL with an arbitrary frozen HTTP::Response blob, causing the victim's next get() of that URL to return attacker controlled response bytes. Because the bytes are passed to Storable::thaw, a victim process that has loaded any class with a side-effectful STORABLE_thaw, DESTROY, or overload hook can be escalated to arbitrary code execution.

Severity

5.3 (Medium)


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

CWE

CWE-732 - Incorrect Permission Assignment for Critical Resource
CWE-502 - Deserialization of Untrusted Data

Assigner

CPANSec

References

3 references

URL	Tags
https://github.com/libwww-perl/WWW-Mechanize-Cach…	patch
https://github.com/libwww-perl/WWW-Mechanize-Cach…	patch
https://metacpan.org/release/OALDERS/WWW-Mechaniz…	release-notes

Impacted products

1 product

Vendor	Product	Version
OALDERS	WWW::Mechanize::Cached	Affected: 0 , < 2.00 (custom)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-8612

Vulnerability from fkie_nvd - Published: 2026-05-15 02:16 - Updated: 2026-05-18 18:17

Severity

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

Summary

References

URL	Tags
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/libwww-perl/WWW-Mechanize-Cached/commit/b821647deeedf83490ebc1db91d959d942300ce0.patch	Patch
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/libwww-perl/WWW-Mechanize-Cached/pull/36	Issue Tracking, Patch
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/OALDERS/WWW-Mechanize-Cached-2.00/changes	Release Notes
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/15/1	Mailing List, Third Party Advisory

Impacted products

	Vendor	Product	Version
	oalders	www\	\

JSON

To clipboard

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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:oalders:www\\:\\:mechanize\\:\\:cached:*:*:*:*:*:perl:*:*",
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    }
  ],
  "id": "CVE-2026-8612",
  "lastModified": "2026-05-18T18:17:21.243",
  "metrics": {
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        "cvssData": {
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          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
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}

GHSA-38R9-G25V-VCVR

Vulnerability from github – Published: 2026-05-15 03:30 – Updated: 2026-05-15 15:30

Details

WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable on-disk cache, enabling local response forgery and code execution.

With no explicit cache backend, WWW::Mechanize::Cached constructs a default Cache::FileCache under /tmp/FileCache without overriding the backend's documented directory_umask of 000, so the cache root and its subdirectories are created mode 0777 with no sticky bit. Cache entries are named by sha1_hex of the request and read back through Storable::thaw on the next cache hit.

A local attacker with write access to the cache tree can replace a victim's cache entry for a known URL with an arbitrary frozen HTTP::Response blob, causing the victim's next get() of that URL to return attacker controlled response bytes. Because the bytes are passed to Storable::thaw, a victim process that has loaded any class with a side-effectful STORABLE_thaw, DESTROY, or overload hook can be escalated to arbitrary code execution.

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2026-8612"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-15T02:16:23Z",
    "severity": "MODERATE"
  },
  "details": "WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable on-disk cache, enabling local response forgery and code execution.\n\nWith no explicit cache backend, WWW::Mechanize::Cached constructs a default Cache::FileCache under /tmp/FileCache without overriding the backend\u0027s documented directory_umask of 000, so the cache root and its subdirectories are created mode 0777 with no sticky bit. Cache entries are named by sha1_hex of the request and read back through Storable::thaw on the next cache hit.\n\nA local attacker with write access to the cache tree can replace a victim\u0027s cache entry for a known URL with an arbitrary frozen HTTP::Response blob, causing the victim\u0027s next get() of that URL to return attacker controlled response bytes. Because the bytes are passed to Storable::thaw, a victim process that has loaded any class with a side-effectful STORABLE_thaw, DESTROY, or overload hook can be escalated to arbitrary code execution.",
  "id": "GHSA-38r9-g25v-vcvr",
  "modified": "2026-05-15T15:30:41Z",
  "published": "2026-05-15T03:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8612"
    },
    {
      "type": "WEB",
      "url": "https://github.com/libwww-perl/WWW-Mechanize-Cached/pull/36"
    },
    {
      "type": "WEB",
      "url": "https://github.com/libwww-perl/WWW-Mechanize-Cached/commit/b821647deeedf83490ebc1db91d959d942300ce0.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/OALDERS/WWW-Mechanize-Cached-2.00/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/15/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}

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.

Action not permitted

CVE-2026-8612 (GCVE-0-2026-8612)

FKIE_CVE-2026-8612

GHSA-38R9-G25V-VCVR

Tags

Sightings

Nomenclature