Vulnerability-Lookup

GHSA-9C48-W39G-HM26

Vulnerability from github – Published: 2026-01-06 18:14 – Updated: 2026-01-08 21:18

Summary

rsa crate has potential panic on a prime being equal to 1

Details

When creating a RSA private key from its components, the construction panics, instead of returning an error, when one of the primes is 1.

Discovered by Christian Reitter from Radically Open Security during a security review for Proton AG.

Severity

2.7 (Low)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.9.9"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "rsa"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-21895"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-703"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-06T18:14:08Z",
    "nvd_published_at": "2026-01-08T14:15:57Z",
    "severity": "LOW"
  },
  "details": "When creating a RSA private key from its components, the construction panics, instead of returning an error, when one of the primes is `1`. \n\nDiscovered by Christian Reitter from [Radically Open Security](https://www.radicallyopensecurity.com/) during a security review for [Proton AG](https://proton.me/).",
  "id": "GHSA-9c48-w39g-hm26",
  "modified": "2026-01-08T21:18:57Z",
  "published": "2026-01-06T18:14:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/RustCrypto/RSA/security/advisories/GHSA-9c48-w39g-hm26"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21895"
    },
    {
      "type": "WEB",
      "url": "https://github.com/RustCrypto/RSA/commit/2926c91bef7cb14a7ccd42220a698cf4b1b692f7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/RustCrypto/RSA"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rsa crate has potential panic on a prime being equal to 1"
}

CVE-2026-21895 (GCVE-0-2026-21895)

Vulnerability from cvelistv5 – Published: 2026-01-08 14:06 – Updated: 2026-01-08 15:55

Title

rsa crate has potential panic on a prime being equal to 1

Summary

The `rsa` crate is an RSA implementation written in rust. Prior to version 0.9.10, when creating a RSA private key from its components, the construction panics instead of returning an error when one of the primes is `1`. Version 0.9.10 fixes the issue.

Severity

2.7 (Low)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-08 14:52 UTC

CWE

CWE-703 - Improper Check or Handling of Exceptional Conditions

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/RustCrypto/RSA/security/adviso…	x_refsource_CONFIRM
https://github.com/RustCrypto/RSA/commit/2926c91b…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
RustCrypto	RSA	Affected: < 0.9.10

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21895",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-08T14:52:10.453165Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-08T15:55:13.043Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "RSA",
          "vendor": "RustCrypto",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.9.10"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The `rsa` crate is an RSA implementation written in rust. Prior to version 0.9.10, when creating a RSA private key from its components, the construction panics instead of returning an error when one of the primes is `1`. Version 0.9.10 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 2.7,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-703",
              "description": "CWE-703: Improper Check or Handling of Exceptional Conditions",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-08T14:06:29.288Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
        {
          "name": "https://github.com/RustCrypto/RSA/security/advisories/GHSA-9c48-w39g-hm26",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/RustCrypto/RSA/security/advisories/GHSA-9c48-w39g-hm26"
        },
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          "name": "https://github.com/RustCrypto/RSA/commit/2926c91bef7cb14a7ccd42220a698cf4b1b692f7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/RustCrypto/RSA/commit/2926c91bef7cb14a7ccd42220a698cf4b1b692f7"
        }
      ],
      "source": {
        "advisory": "GHSA-9c48-w39g-hm26",
        "discovery": "UNKNOWN"
      },
      "title": "rsa crate has potential panic on a prime being equal to 1"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-21895",
    "datePublished": "2026-01-08T14:06:29.288Z",
    "dateReserved": "2026-01-05T17:24:36.929Z",
    "dateUpdated": "2026-01-08T15:55:13.043Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.