What is the CVSS score of CVE-2026-27171?

CVE-2026-27171 has a CVSS 3.1 base score of 2.9 (Low). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L. EPSS exploitation probability: 0.0%.

Which versions of Zlib are affected by CVE-2026-27171?

CVE-2026-27171 is a low-severity vulnerability in zlib before 1.3.2 (CVSS 2.9). The limited severity suggests constrained impact, typically requiring specific conditions or local access for…

Is there a public PoC exploit available for CVE-2026-27171?

Yes, a public proof-of-concept exploit is available for CVE-2026-27171. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27171?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Zlib CVE-2026-27171

LOW

Improper Validation of Specified Quantity in Input (CWE-1284)

2026-02-18 cve@mitre.org

Information Disclosure Zlib

2.9

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

2.9 LOW

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Lifecycle Timeline

PoC Detected

Mar 25, 2026 - 21:27 vuln.today

Public exploit code

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 18, 2026 - 04:16 nvd

LOW 2.9

DescriptionCVE.org

zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.

AnalysisAI

zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition. [CVSS 2.9 LOW]

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Vulnerability AssessmentAI

Risk Assessment	CVSS 2.9 (LOW). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

During next maintenance window: Apply vendor patches when convenient. …

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CVE-2026-27171 vulnerability details – vuln.today

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Zlib CVE-2026-27171

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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External POC / Exploit Code