Vulnerability-Lookup

GHSA-88G7-87JG-W4Q9

Vulnerability from github – Published: 2026-06-16 00:34 – Updated: 2026-06-16 18:32

Details

Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery.

Crypt::DSA::sign caches the per-signature nonce material in the Key object without ever clearing it.

The first sign() on a Key object picks a nonce, and every later sign() on that same object reuses it, producing an identical "r".

Keys used to sign more than once with an affected version should be considered compromised.

Severity ?

9.1 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-12205"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-323"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-15T23:16:43Z",
    "severity": "CRITICAL"
  },
  "details": "Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery.\n\nCrypt::DSA::sign caches the per-signature nonce material in the Key object without ever clearing it.\n\nThe first sign() on a Key object picks a nonce, and every later sign() on that same object reuses it, producing an identical \"r\".\n\nKeys used to sign more than once with an affected version should be considered compromised.",
  "id": "GHSA-88g7-87jg-w4q9",
  "modified": "2026-06-16T18:32:34Z",
  "published": "2026-06-16T00:34:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12205"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/source/lib/Crypt/DSA.pm#L47"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/15/4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-12205 (GCVE-0-2026-12205)

Vulnerability from cvelistv5 – Published: 2026-06-15 21:57 – Updated: 2026-06-16 16:13

Title

Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery

Summary

Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery. Crypt::DSA::sign caches the per-signature nonce material in the Key object without ever clearing it. The first sign() on a Key object picks a nonce, and every later sign() on that same object reuses it, producing an identical "r". Keys used to sign more than once with an affected version should be considered compromised.

Severity ?

9.1 (Critical)


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

CWE

CWE-323 - Reusing a Nonce, Key Pair in Encryption

Assigner

CPANSec

References

URL

Tags

	https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1…
	https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1…	release-notes

Impacted products

	Vendor	Product	Version
	TIMLEGGE	Crypt::DSA	Affected: 0 , < 1.21 (custom)

Credits

Richard Kettlewell

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-06-15T22:44:28.639Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/06/15/4"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 9.1,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
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            "other": {
              "content": {
                "id": "CVE-2026-12205",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-16T16:13:28.769417Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-16T16:13:32.533Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Crypt-DSA",
          "product": "Crypt::DSA",
          "programFiles": [
            "lib/Crypt/DSA.pm"
          ],
          "programRoutines": [
            {
              "name": "Crypt::DSA::sign"
            }
          ],
          "repo": "https://github.com/perl-Crypt-OpenPGP/Crypt-DSA",
          "vendor": "TIMLEGGE",
          "versions": [
            {
              "lessThan": "1.21",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
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        }
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      "credits": [
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          "type": "finder",
          "value": "Richard Kettlewell"
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      "descriptions": [
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        }
      ],
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        "dateUpdated": "2026-06-15T21:57:18.317Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
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          "url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/source/lib/Crypt/DSA.pm#L47"
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          "tags": [
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          ],
          "url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/changes"
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      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to version 1.21\n\nRevoke any keys that may have been compromised.\n\nCrypt::DSA was deprecated in version 1.20. You should migrate to another solution."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
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          "lang": "en",
          "time": "2026-05-16T00:00:00.000Z",
          "value": "Maintainer contacted"
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          "time": "2026-06-13T00:00:00.000Z",
          "value": "Maintainer and CPANSec contacted"
        },
        {
          "lang": "en",
          "time": "2026-06-14T00:00:00.000Z",
          "value": "Fixed version released"
        }
      ],
      "title": "Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
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    "datePublished": "2026-06-15T21:57:18.317Z",
    "dateReserved": "2026-06-14T12:07:30.610Z",
    "dateUpdated": "2026-06-16T16:13:32.533Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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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-88G7-87JG-W4Q9

CVE-2026-12205 (GCVE-0-2026-12205)

Tags

Sightings

Nomenclature