How severe is CVE-2025-59956?

CVE-2025-59956 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-59956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59956?

CVE-2025-59956 affects Coder Agentapi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59956?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-59956 have an EU (EUVD) identifier?

Yes. CVE-2025-59956 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31619.

When was CVE-2025-59956 published?

CVE-2025-59956 was published on 2025-09-30 and last updated on 2026-06-17.

CVE-2025-59956

CVE-2025-59956 is a medium-severity vulnerability in Coder Agentapi with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-290.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-31619
Weakness: CWE-290
Affected product: Coder Agentapi
Published: 2025-09-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-59956?: 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.
How severe is CVE-2025-59956?: CVE-2025-59956 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-59956 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59956?: CVE-2025-59956 affects Coder Agentapi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59956?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-59956 have an EU (EUVD) identifier?: Yes. CVE-2025-59956 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31619.
When was CVE-2025-59956 published?: CVE-2025-59956 was published on 2025-09-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:coder:agentapi:*:*:*:*:*:*:*:*

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