Is CVE-2026-27171 in the CISA KEV catalog?

No. CVE-2026-27171 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2026-27171 has a CVSS v3 base score of 2.9 (Low).

What is the EPSS score for CVE-2026-27171?

CVE-2026-27171 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-27171?

Upgrade zlib on debian unstable to 1:1.3.dfsg+really1.3.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-27171

LOW

2.9

CVSS v3

NVD

Description

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.

CWE-1284

How to fix

Remediation Available

zlibDebian

Fixed in:1:1.3.dfsg+really1.3.2-1CVE-2026-27171

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Exploit1

github.com

Release Notes1

github.com

Technical Description1

7asecurity.com

Product2

Related Vulnerabilities

Other CWE-1284 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-20699	Critical	10.0	72%	KEV	-
CVE-2021-43267	Critical	9.8	58%	-	Fix
CVE-2022-31629	Medium	6.5	49%	-	Fix
CVE-2025-9316	Unscored	-	37%	-	-
CVE-2022-36620	High	7.5	23%	-	-
CVE-2008-1440	High	7.1	23%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-25.