Vulnerability-Lookup

GHSA-P96H-94Q2-FH5V

Vulnerability from github – Published: 2026-03-22 15:31 – Updated: 2026-03-22 15:31

Details

A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.

Severity ?

3.7 (Low)


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

2.9 (Low)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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{
  "affected": [],
  "aliases": [
    "CVE-2026-4115"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-22T13:16:20Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.",
  "id": "GHSA-p96h-94q2-fh5v",
  "modified": "2026-03-22T15:31:28Z",
  "published": "2026-03-22T15:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4115"
    },
    {
      "type": "WEB",
      "url": "https://git.tartarus.org/?p=simon/putty.git;a=commitdiff;h=af996b5ec27ab79bae3882071b9d6acf16044549"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-thok/putty-ed25519-malleability-s-plus-l"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-thok/putty-ed25519-malleability-s-plus-l/blob/main/poc.py"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?ctiid.352429"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.352429"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?submit.775576"
    },
    {
      "type": "WEB",
      "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/eddsa-overlarge-s.html"
    },
    {
      "type": "WEB",
      "url": "https://www.rfc-editor.org/rfc/rfc8032#section-8.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-4115 (GCVE-0-2026-4115)

Vulnerability from cvelistv5 – Published: 2026-03-22 12:15 – Updated: 2026-03-23 15:32 Disputed X_Open Source

Title

PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification

Summary

Severity ?

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

3.7 (Low)


                        
                          CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

CWE

CWE-347 - Improper Verification of Cryptographic Signature
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

VulDB

References

URL

Tags

	https://vuldb.com/?id.352429	vdb-entrytechnical-description
	https://vuldb.com/?ctiid.352429	signaturepermissions-required
	https://vuldb.com/?submit.775576	third-party-advisory
	https://github.com/py-thok/putty-ed25519-malleabi…	related
	https://www.chiark.greenend.org.uk/~sgtatham/putt…	related
	https://github.com/py-thok/putty-ed25519-malleabi…	exploit
	https://git.tartarus.org/?p=simon/putty.git;a=com…	patch
	https://www.rfc-editor.org/rfc/rfc8032#section-8.4	related

Impacted products

	Vendor	Product	Version
	n/a	PuTTY	Affected: 0.83 cpe:2.3:a:putty:putty::::::::

Credits

pythok (VulDB User) VulDB

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-4115",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-23T15:32:32.298237Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-23T15:32:42.204Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Ed25519 Signature Handler"
          ],
          "product": "PuTTY",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "0.83"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "pythok (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 2.6,
            "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-22T12:20:27.727Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-352429 | PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/?id.352429"
        },
        {
          "name": "VDB-352429 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/?ctiid.352429"
        },
        {
          "name": "Submit #775576 | PuTTY Project (Simon Tatham) PuTTY 0.83 Improper Verification of Cryptographic Signature",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/?submit.775576"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://github.com/py-thok/putty-ed25519-malleability-s-plus-l"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/eddsa-overlarge-s.html"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://github.com/py-thok/putty-ed25519-malleability-s-plus-l/blob/main/poc.py"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://git.tartarus.org/?p=simon/putty.git;a=commitdiff;h=af996b5ec27ab79bae3882071b9d6acf16044549"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://www.rfc-editor.org/rfc/rfc8032#section-8.4"
        }
      ],
      "tags": [
        "disputed",
        "x_open-source"
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-03-22T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-03-22T01:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-03-22T12:54:35.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-4115",
    "datePublished": "2026-03-22T12:15:07.531Z",
    "dateReserved": "2026-03-13T12:09:58.769Z",
    "dateUpdated": "2026-03-23T15:32:42.204Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-P96H-94Q2-FH5V

CVE-2026-4115 (GCVE-0-2026-4115)

Tags

Sightings

Nomenclature