How severe is CVE-2026-27735?

CVE-2026-27735 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-2026-27735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27735?

CVE-2026-27735 affects Lfprojects Model Context Protocol Servers. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27735?

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

Does CVE-2026-27735 have an EU (EUVD) identifier?

Yes. CVE-2026-27735 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8770.

When was CVE-2026-27735 published?

CVE-2026-27735 was published on 2026-02-26 and last updated on 2026-06-17.

CVE-2026-27735

CVE-2026-27735 is a medium-severity vulnerability in Lfprojects Model Context Protocol Servers 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-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.4
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8770
Weakness: CWE-22
Affected product: Lfprojects Model Context Protocol Servers
Published: 2026-02-26
Last modified: 2026-06-17

Description

Model Context Protocol Servers is a collection of reference implementations for the model context protocol (MCP). In mcp-server-git versions prior to 2026.1.14, the git_add tool did not validate that file paths provided in the files argument were within the repository boundaries. Because the tool used GitPython's repo.index.add() rather than the Git CLI, relative paths containing `../` sequences that resolve outside the repository were accepted and staged into the Git index. Users are advised to upgrade to 2026.1.14 or newer to remediate this issue.

Frequently asked questions

What is CVE-2026-27735?: Model Context Protocol Servers is a collection of reference implementations for the model context protocol (MCP). In mcp-server-git versions prior to 2026.1.14, the git_add tool did not validate that file paths provided in the files argument were within the repository boundaries. Because the tool used GitPython's repo.index.add() rather than the Git CLI, relative paths containing `../` sequences that resolve outside the repository were accepted and staged into the Git index. Users are advised to upgrade to 2026.1.14 or newer to remediate this issue.
How severe is CVE-2026-27735?: CVE-2026-27735 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-2026-27735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27735?: CVE-2026-27735 affects Lfprojects Model Context Protocol Servers. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27735 have an EU (EUVD) identifier?: Yes. CVE-2026-27735 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8770.
When was CVE-2026-27735 published?: CVE-2026-27735 was published on 2026-02-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lfprojects:model_context_protocol_servers:*:*:*:*:*:*:*:*

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