CVE-2025-70888

CRITICALNVD 9.89.8—

9.8

An issue in mtrojnar Osslsigncode affected at v2.10 and before allows a remote attacker to escalate privileges via the osslsigncode.c component

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 32.6%
KEV: Not listed

Published

March 25, 2026

Last Modified

April 2, 2026

Advisory Details (3)

Auto-updated May 18, 2026

No patch confirmed yet.

generic

bug: Validation weaknesses concerning X.509 Key Usage · Issue #60 · ralphje/signify · GitHub

https://github.com/ralphje/signify/issues/60

generic

Add keyUsage digitalSignature validation for signer certificate by olszomal · Pull Request #477 · mtrojnar/osslsigncode · GitHub

https://github.com/mtrojnar/osslsigncode/pull/477

generic

bug: Validation weaknesses concerning X.509 Key Usage · Issue #475 · mtrojnar/osslsigncode · GitHub

https://github.com/mtrojnar/osslsigncode/issues/475

Vendor Advisories for CVE-2025-70888(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2025-70888
Microsoft Security Response Center (MSRC)Low
An issue in mtrojnar Osslsigncode affected at v2.10 and before allows a remote attacker to escalate privileges via the osslsigncode.c component

Data Freshness Timeline

(refreshed 19× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(5)

What is CVE-2025-70888?

CVE-2025-70888 is a critical vulnerability published on March 25, 2026. An issue in mtrojnar Osslsigncode affected at v2.10 and before allows a remote attacker to escalate privileges via the osslsigncode.c component

When was CVE-2025-70888 disclosed?

CVE-2025-70888 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on April 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-70888 actively exploited?

CVE-2025-70888 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-70888?

CVE-2025-70888 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2025-70888?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-70888, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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Frequently asked(5)

What is CVE-2025-70888?

When was CVE-2025-70888 disclosed?

Is CVE-2025-70888 actively exploited?

What is the CVSS score of CVE-2025-70888?

CVE-2025-70888 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2025-70888?

CVE-2025-70888

📅 Published

🔄 Last Modified

📋 Advisory Details (3)

bug: Validation weaknesses concerning X.509 Key Usage · Issue #60 · ralphje/signify · GitHub

Add keyUsage digitalSignature validation for signer certificate by olszomal · Pull Request #477 · mtrojnar/osslsigncode · GitHub

bug: Validation weaknesses concerning X.509 Key Usage · Issue #475 · mtrojnar/osslsigncode · GitHub

📣 Vendor Advisories for CVE-2025-70888(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-70888?

CVE-2025-70888

📅 Published

🔄 Last Modified

📋 Advisory Details (3)

bug: Validation weaknesses concerning X.509 Key Usage · Issue #60 · ralphje/signify · GitHub

Add keyUsage digitalSignature validation for signer certificate by olszomal · Pull Request #477 · mtrojnar/osslsigncode · GitHub

bug: Validation weaknesses concerning X.509 Key Usage · Issue #475 · mtrojnar/osslsigncode · GitHub

📣 Vendor Advisories for CVE-2025-70888(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-70888?

Published

Last Modified

Advisory Details (3)

Vendor Advisories for CVE-2025-70888(1)

Frequently asked(5)

Published

Last Modified

Advisory Details (3)

Vendor Advisories for CVE-2025-70888(1)

Frequently asked(5)