CVE-2022-36056Public exploit

Invalid artifact acceptance via fail-open blob verification

Published Sep 14, 2022 · Updated Apr 22, 2025

Improper signature verification in Sigstore Cosign before 1.12.0 allows local users to make verify-blob accept invalid artifacts. The verify-blob paths fail open when bundle fields do not bind the signature, identity constraints are ignored, or Rekor validation errors trigger early success. Exploitation requires control of verification inputs and undermines artifact-integrity decisions without directly disclosing data or interrupting the service.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in Sigstore Cosign before 1.12.0 allows local users to make verify-blob accept invalid artifacts. The verify-blob paths fail open when bundle fields do not bind the signature, identity constraints are ignored, or Rekor validation errors trigger early success. Exploitation requires control of verification inputs and undermines artifact-integrity decisions without directly disclosing data or interrupting the service.

The record

CVE
CVE-2022-36056
Published
Sep 14, 2022
Updated
Apr 22, 2025
Vendor
Sigstore
Product
Cosign
Classifications
CWE-347, T1553.002
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.12.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Sigstore · Cosignversion=< 1.12.0

Published CVSS scores

5.5GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1553.002Subvert Trust Controls: Code Signing

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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