Vulnerability-Lookup

ubuntu-cve-2026-54787

Vulnerability from osv_ubuntu

Published

2026-08-04 00:00

Modified

2026-08-04 00:00

Summary

Details

sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.

Severity

3.1 (Low)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-54787	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-54787	REPORT
	https://github.com/sigstore/sigstore-go/security/…	REPORT
	https://github.com/sigstore/sigstore-go/pull/642	REPORT
	https://github.com/sigstore/sigstore-go/commit/45…	REPORT
	https://github.com/sigstore/sigstore-go/commit/45…	REPORT
	https://github.com/sigstore/sigstore-go/releases/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-sigstore-sigstore-go-dev",
            "binary_version": "1.1.4-1ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "sigstore-go",
            "binary_version": "1.1.4-1ubuntu0.26.04.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "sigstore-go",
        "purl": "pkg:deb/ubuntu/sigstore-go@1.1.4-1ubuntu0.26.04.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.1-2",
        "0.7.3-1",
        "0.7.3-2",
        "1.1.4-1",
        "1.1.4-1ubuntu0.26.04.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.",
  "id": "UBUNTU-CVE-2026-54787",
  "modified": "2026-08-04T00:00:00Z",
  "published": "2026-08-04T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-54787"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-54787"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sigstore/sigstore-go/pull/642"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-54787"
  ]
}

CVE-2026-54787 (GCVE-0-2026-54787)

Vulnerability from cvelistv5 – Published: 2026-07-31 21:58 – Updated: 2026-07-31 23:36

Title

sigstore-go fails to check signature timestamps against a signing key's validity period

Summary

Severity

3.1 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-324 - Use of a Key Past its Expiration Date

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/sigstore/sigstore-go/security/…	x_refsource_CONFIRM
https://github.com/sigstore/sigstore-go/pull/642	x_refsource_MISC
https://github.com/sigstore/sigstore-go/commit/45…	x_refsource_MISC
https://github.com/sigstore/sigstore-go/releases/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
sigstore	sigstore-go	Affected: < 1.2.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54787",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-31T23:35:40.966529Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-31T23:36:13.441Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "sigstore-go",
          "vendor": "sigstore",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-324",
              "description": "CWE-324: Use of a Key Past its Expiration Date",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-31T21:58:14.156Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"
        },
        {
          "name": "https://github.com/sigstore/sigstore-go/pull/642",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sigstore/sigstore-go/pull/642"
        },
        {
          "name": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f"
        },
        {
          "name": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1"
        }
      ],
      "source": {
        "advisory": "GHSA-wqqc-jjcq-vfxm",
        "discovery": "UNKNOWN"
      },
      "title": "sigstore-go fails to check signature timestamps against a signing key\u0027s validity period"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54787",
    "datePublished": "2026-07-31T21:58:14.156Z",
    "dateReserved": "2026-06-15T23:23:57.714Z",
    "dateUpdated": "2026-07-31T23:36:13.441Z",
    "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.

Action not permitted

ubuntu-cve-2026-54787

Vulnerability from osv_ubuntu

CVE-2026-54787 (GCVE-0-2026-54787)

Tags

Sightings

Nomenclature