Vulnerability-Lookup

SUSE-SU-2026:2365-1

Vulnerability from csaf_suse - Published: 2026-06-11 07:58 - Updated: 2026-06-11 07:58

Summary

Security update for cosign

Severity

Moderate

Notes

Title of the patch: Security update for cosign

Description of the patch: This update for cosign fixes the following issue - CVE-2026-39395: Incorrect attestation verification due to malformed payloads or mismatched predicate types (bsc#1261859). Changes for cosign: - update to 3.0.6: * Fix DSSE predicate check (GHSA-w6c6-c85g-mmv6) (#4801) * Handle whitespace-only certificate annotation (#4760) * fix(sign): closing SignerVerifier too early when signing with a security key (#4761) * Disallow --new-bundle-format and --rfc3161-timestamp (#4762) * support managed keys in conformance testing (#4728) * Add support for GCE metadata server env var (#4732) * fix: preserve per-layer annotations in WriteAttestationsReferrer (#4709) * Fix parsing of in-toto for string predicates * Mark batch of flags for deprecation (#4698) * disallow key and cert identity being used together during verification (#4636) * support key creation in GitLab group (#4704) - Set CGO_ENABLED=1 for fixing s390x failed build - build against a maintained golang version (upstream uses go1.20)

Patchnames: SUSE-2026-2365,SUSE-SLE-Module-Basesystem-15-SP7-2026-2365

CVE-2026-39395

6.5 (Medium)


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

Affected products

Recommended 6 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:cosign-3.0.6-150400.3.42.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:cosign-3.0.6-150400.3.42.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:cosign-3.0.6-150400.3.42.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:cosign-3.0.6-150400.3.42.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:cosign-bash-completion-3.0.6-150400.3.42.1.noarch	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:cosign-zsh-completion-3.0.6-150400.3.42.1.noarch	—	Vendor Fix

Threats

Impact moderate

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-updates/2026…	self
https://bugzilla.suse.com/1261859	self
https://www.suse.com/security/cve/CVE-2026-39395/	self
https://www.suse.com/security/cve/CVE-2026-39395	external
https://bugzilla.suse.com/1261859	external

JSON

To clipboard

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          "text": "Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a \"Verified OK\" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 and 2.6.3.",
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}

CVE-2026-39395 (GCVE-0-2026-39395)

Vulnerability from cvelistv5 – Published: 2026-04-07 20:06 – Updated: 2026-04-08 15:49

Title

Cosign's verify-blob-attestation reports false positive when payload parsing fails

Summary

Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a "Verified OK" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 and 2.6.3.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-08 15:49 UTC

CWE

CWE-754 - Improper Check for Unusual or Exceptional Conditions

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/sigstore/cosign/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
sigstore	cosign	Affected: >= 3.0.0, < 3.0.6 Affected: < 2.6.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39395",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-08T15:49:08.895545Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-08T15:49:16.587Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "cosign",
          "vendor": "sigstore",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.0.6"
            },
            {
              "status": "affected",
              "version": "\u003c 2.6.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a \"Verified OK\" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 and 2.6.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-754",
              "description": "CWE-754: Improper Check for Unusual or Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-07T20:06:28.798Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sigstore/cosign/security/advisories/GHSA-w6c6-c85g-mmv6"
        }
      ],
      "source": {
        "advisory": "GHSA-w6c6-c85g-mmv6",
        "discovery": "UNKNOWN"
      },
      "title": "Cosign\u0027s verify-blob-attestation reports false positive when payload parsing fails"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-39395",
    "datePublished": "2026-04-07T20:06:28.798Z",
    "dateReserved": "2026-04-06T22:06:40.516Z",
    "dateUpdated": "2026-04-08T15:49:16.587Z",
    "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.

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.

Action not permitted

SUSE-SU-2026:2365-1

CVE-2026-39395 (GCVE-0-2026-39395)

Tags

Sightings

Nomenclature

Related by attack behaviour