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MEDIUM severity

CVE-2025-27155 — pinecone

MEDIUMFix: matrix-org/pinecone@218b280

CVE-2025-27155 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in github.com/matrix-org/pinecone. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

In-memory stored Cross-site scripting (XSS) vulnerability in pineconesim

Also known asGHSA-fr62-mg2q-7wqvGO-2025-3500
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-27155.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs15th percentile — riskier than 15% of all scored CVEsHighest risk
0.00%0.25%0.49%0.73%0.2%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/matrix-org/pinecone

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Impact

The Pinecone Simulator (pineconesim) included in Pinecone up to commit https://github.com/matrix-org/pinecone/commit/ea4c33717fd74ef7d6f49490625a0fa10e3f5bbc is vulnerable to stored cross-site scripting. The payload storage is not permanent and will be wiped when restarting pineconsim.

Patches

Commit https://github.com/matrix-org/pinecone/commit/218b2801995b174085cb1c8fafe2d3aa661f85bd contains the fixes.

Workarounds

N/A

For more information

If you have any questions or comments about this advisory, please email us at security at matrix.org.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/matrix-org/pineconeall versionsNo fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/matrix-org/pinecone, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of github.com/matrix-org/pinecone for CVE-2025-27155. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact The Pinecone Simulator (pineconesim) included in Pinecone up to commit https://github.com/matrix-org/pinecone/commit/ea4c33717fd74ef7d6f49490625a0fa10e3f5bbc is vulnerable to stored cross-site scripting. The payload storage is not permanent and will be wiped when restarting pineconsim. ### Patches Commit https://github.com/matrix-org/pinecone/commit/218b2801995b174085cb1c8fafe2d3aa661f85bd contains the fixes. ### Workarounds N/A ### For more information If you have any questions or comments about this advisory, please email us at [security at matrix.org](mailto:[email protected]
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CVE-2025-27155: pinecone XSS (Medium 6.1)