Vulnerability-Lookup

GHSA-4P3P-7392-HJW4

Vulnerability from github – Published: 2026-05-28 18:30 – Updated: 2026-05-29 18:31

Details

CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers.

The gcm_decrypt_verify, ccm_decrypt_verify, chacha20poly1305_decrypt_verify and eax_decrypt_verify XS routines copied the caller-supplied authentication tag into a fixed 144-byte stack buffer (MAXBLOCKSIZE) without checking the supplied length. A longer tag overwrites the stack past the buffer. Version 0.088 added the clamp to gcm_decrypt_verify, and 0.088_001 added it to the other three.

Any caller of an affected helper that forwards an attacker-controlled tag longer than the buffer can trigger the overflow.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-41565"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T16:16:22Z",
    "severity": "HIGH"
  },
  "details": "CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers.\n\nThe gcm_decrypt_verify, ccm_decrypt_verify, chacha20poly1305_decrypt_verify and eax_decrypt_verify XS routines copied the caller-supplied authentication tag into a fixed 144-byte stack buffer (MAXBLOCKSIZE) without checking the supplied length. A longer tag overwrites the stack past the buffer. Version 0.088 added the clamp to gcm_decrypt_verify, and 0.088_001 added it to the other three.\n\nAny caller of an affected helper that forwards an attacker-controlled tag longer than the buffer can trigger the overflow.",
  "id": "GHSA-4p3p-7392-hjw4",
  "modified": "2026-05-29T18:31:18Z",
  "published": "2026-05-28T18:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41565"
    },
    {
      "type": "WEB",
      "url": "https://github.com/DCIT/perl-CryptX/commit/57e69e541b0718ca8724c2f61514322a2d859bc1.patch"
    },
    {
      "type": "WEB",
      "url": "https://github.com/DCIT/perl-CryptX/commit/7e56347d420aaf43b2ee1586f4a230492ccf1642.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/MIK/CryptX-0.088_001"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/28/10"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-41565 (GCVE-0-2026-41565)

Vulnerability from cvelistv5 – Published: 2026-05-28 14:13 – Updated: 2026-05-29 15:53

Title

CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers

Summary

CryptX versions before 0.088_001 for Perl have a stack buffer overflow in four AEAD decrypt_verify helpers. The gcm_decrypt_verify, ccm_decrypt_verify, chacha20poly1305_decrypt_verify and eax_decrypt_verify XS routines copied the caller-supplied authentication tag into a fixed 144-byte stack buffer (MAXBLOCKSIZE) without checking the supplied length. A longer tag overwrites the stack past the buffer. Version 0.088 added the clamp to gcm_decrypt_verify, and 0.088_001 added it to the other three. Any caller of an affected helper that forwards an attacker-controlled tag longer than the buffer can trigger the overflow.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

CPANSec

References

4 references

URL	Tags
https://github.com/DCIT/perl-CryptX/commit/57e69e…	patch
https://github.com/DCIT/perl-CryptX/commit/7e5634…	patch
https://metacpan.org/release/MIK/CryptX-0.088_001	release-notes
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
MIK	CryptX	Affected: 0 , < 0.088_001 (custom)

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JSON

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        "providerMetadata": {
          "dateUpdated": "2026-05-28T22:33:27.672Z",
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        "references": [
          {
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          }
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              "attackVector": "NETWORK",
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              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
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              "content": {
                "id": "CVE-2026-41565",
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                  },
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                  }
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                "timestamp": "2026-05-29T15:53:14.685373Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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      }
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    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "CryptX",
          "product": "CryptX",
          "programFiles": [
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            "inc/CryptX_AuthEnc_CCM.xs.inc",
            "inc/CryptX_AuthEnc_ChaCha20Poly1305.xs.inc",
            "inc/CryptX_AuthEnc_EAX.xs.inc"
          ],
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              "name": "chacha20poly1305_decrypt_verify"
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          "url": "https://metacpan.org/release/MIK/CryptX-0.088_001"
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      "solutions": [
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          "lang": "en",
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      "source": {
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          "value": "Issue reported."
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          "time": "2026-04-23T00:00:00.000Z",
          "value": "Version 0.088 released with fix for gcm_decrypt_verify."
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        {
          "lang": "en",
          "time": "2026-04-28T00:00:00.000Z",
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  },
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}

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

GHSA-4P3P-7392-HJW4

CVE-2026-41565 (GCVE-0-2026-41565)

Tags

Sightings

Nomenclature