Is CVE-2025-59956 in the CISA KEV catalog?

No. CVE-2025-59956 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-59956?

CVE-2025-59956 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2025-59956?

CVE-2025-59956 has an EPSS score of 0.40% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-59956?

Upgrade agentapi to 0.4.0 or later.

CVE & CISA-KEV Catalog

CVE-2025-59956

MEDIUM

6.5

CVSS v3

NVD

Description

AgentAPI is an HTTP API for Claude Code, Goose, Aider, Gemini, Amp, and Codex. Versions 0.3.3 and below are susceptible to a client-side DNS rebinding attack when hosted over plain HTTP on localhost. An attacker can gain access to the /messages endpoint served by the Agent API. This allows for the unauthorized exfiltration of sensitive user data, specifically local message history, which can include secret keys, file system contents, and intellectual property the user was working on locally. This issue is fixed in version 0.4.0.

CWE-350 CWE-290

How to fix

Remediation Available

agentapiNVD

Affected:< 0.4.0Fixed in:0.4.0CVE-2025-59956derived from NVD

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.40%probability of exploitation in 30 days

32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Patch3

Exploit2

Release Notes1

github.com

Technical Description1

github.blog

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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 2025-10-08.