Is CVE-2026-16158 in the CISA KEV catalog?

No. CVE-2026-16158 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-16158?

CVE-2026-16158 has a CVSS v3 base score of 8.7 (HIGH).

What is the EPSS score for CVE-2026-16158?

CVE-2026-16158 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-16158?

No published fix for CVE-2026-16158 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-16158

HIGH

8.7

CVSS v3

NVD

Description

Impact: @fastify/reply-from versions from 8.3.1 up to but not including 12.6.4 build the internal URL cache key by concatenating the destination and source path without a delimiter. Different destination and source pairs can therefore produce the same key while resolving to different upstream URLs. When getUpstream selects an upstream from request data, a URL cached for one upstream can be reused for a request intended for another upstream, causing cross-upstream data access and modification. The default configuration is affected. Setting disableCache to true prevents the behavior. Patches: upgrade to @fastify/reply-from 12.6.4. Workarounds: pass disableCache: true when registering the plugin.

CWE-441

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-441 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-47269	High	8.3	36%	-	-
CVE-2019-3924	High	7.5	16%	-	Fix
CVE-2020-5412	Medium	6.5	10%	-	Fix
CVE-2019-3996	Medium	6.5	5.9%	-	-
CVE-2021-20042	Critical	9.8	2.7%	-	-
CVE-2019-1841	Medium	6.5	2.6%	-	Fix

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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 2026-07-21.