Vulnerability-Lookup

ubuntu-cve-2026-85393

Vulnerability from osv_ubuntu

Published

2026-09-04 00:00

Modified

2026-09-04 00:00

Summary

Details

node-forge through 1.4.0 fails to validate element count in nested DigestAlgorithm sequences during RSA PKCS#1 v1.5 signature verification. Attackers can embed garbage bytes inside the DigestAlgorithm sequence to forge valid signatures for arbitrary messages using low-exponent RSA keys. This is an incomplete fix for CVE-2026-33894.

Severity

7.5 (High)


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

8.7 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-85393	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-85393	REPORT
	https://github.com/advisories/GHSA-ppp5-5v6c-4jwp	REPORT
	https://github.com/digitalbazaar/forge	REPORT
	https://github.com/digitalbazaar/forge/blob/v1.4.…	REPORT
	https://github.com/digitalbazaar/forge/blob/v1.4.…	REPORT
	https://github.com/digitalbazaar/forge/issues/1149	REPORT
	https://www.vulncheck.com/advisories/node-forge-t…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-node-forge",
            "binary_version": "0.9.1~dfsg-1"
          },
          {
            "binary_name": "node-node-forge",
            "binary_version": "0.9.1~dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "node-node-forge",
        "purl": "pkg:deb/ubuntu/node-node-forge@0.9.1~dfsg-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.8.5~dfsg-2",
        "0.9.1~dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libjs-node-forge",
            "binary_version": "1.2.1~dfsg-2"
          },
          {
            "binary_name": "node-node-forge",
            "binary_version": "1.2.1~dfsg-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-node-forge",
        "purl": "pkg:deb/ubuntu/node-node-forge@1.2.1~dfsg-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.0~dfsg-3",
        "1.2.1~dfsg-2"
      ]
    }
  ],
  "aliases": [],
  "details": "node-forge through 1.4.0 fails to validate element count in nested DigestAlgorithm sequences during RSA PKCS#1 v1.5 signature verification. Attackers can embed garbage bytes inside the DigestAlgorithm sequence to forge valid signatures for arbitrary messages using low-exponent RSA keys. This is an incomplete fix for CVE-2026-33894.",
  "id": "UBUNTU-CVE-2026-85393",
  "modified": "2026-09-04T00:00:00Z",
  "published": "2026-09-04T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-85393"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-85393"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/advisories/GHSA-ppp5-5v6c-4jwp"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/digitalbazaar/forge"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/digitalbazaar/forge/issues/1149"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-85393"
  ]
}

CVE-2026-85393 (GCVE-0-2026-85393)

Vulnerability from cvelistv5 – Published: 2026-09-03 18:54 – Updated: 2026-09-03 19:14

Title

node-forge through 1.4.0 RSA PKCS#1 v1.5 Signature Forgery via Nested DigestAlgorithm Padding

Summary

Severity

8.7 (High)


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

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-03 19:13 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

VulnCheck mitre root

References

6 references

URL	Tags
https://github.com/digitalbazaar/forge/issues/1149	issue-tracking
https://github.com/digitalbazaar/forge	product
https://github.com/digitalbazaar/forge/blob/v1.4.…	technical-description
https://github.com/digitalbazaar/forge/blob/v1.4.…	technical-description
https://github.com/advisories/GHSA-ppp5-5v6c-4jwp	related
https://www.vulncheck.com/advisories/node-forge-t…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
digitalbazaar	forge	Affected: 0 , ≤ 1.4.0 (semver) cpe:2.3:a:digitalbazaar:forge::::::::

Date Public

2026-07-06 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-85393",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-03T19:13:49.956810Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
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        "providerMetadata": {
          "dateUpdated": "2026-09-03T19:14:06.547Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "tags": [
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            "url": "https://github.com/advisories/GHSA-ppp5-5v6c-4jwp"
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        ],
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      }
    ],
    "cna": {
      "affected": [
        {
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          "packageURL": "pkg:npm/node-forge",
          "product": "forge",
          "vendor": "digitalbazaar",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
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                  "versionEndIncluding": "1.4.0",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
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          "type": "finder",
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      ],
      "metrics": [
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          "cvssV4_0": {
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          },
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        },
        {
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    "dateReserved": "2026-09-03T18:10:52.622Z",
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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.

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.