How severe is GHSA-7h5v-85w9-pq6c?

No CVSS score has been assigned to GHSA-7h5v-85w9-pq6c yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-7h5v-85w9-pq6c?

GHSA-7h5v-85w9-pq6c affects the following packages: matrix-synapse (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-7h5v-85w9-pq6c?

Update matrix-synapse to 1.33.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7h5v-85w9-pq6c is resolved across your whole dependency graph.

How do I detect GHSA-7h5v-85w9-pq6c in my PyPI dependencies?

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

How do I mitigate GHSA-7h5v-85w9-pq6c if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is GHSA-7h5v-85w9-pq6c actively exploited in the wild?

No public exploit code has been indexed for GHSA-7h5v-85w9-pq6c yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-7h5v-85w9-pq6c published, and has it been updated?

GHSA-7h5v-85w9-pq6c was published on May 19, 2021 and was last updated on December 2, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

Denial of service (via resource exhaustion) due to improper input validation in third-party identifier endpointGHSA-7h5v-85w9-pq6c

Fix: matrix-org/synapse#9855

GHSA-7h5v-85w9-pq6c is a security vulnerability in matrix-synapse. A fix is available for matrix-synapse — see the affected versions and patch details below.

Published

May 19, 2021

Updated

Dec 2, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Dec 2, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐍matrix-synapse

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

Description

Impact

Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.

Patches

The issue is fixed by https://github.com/matrix-org/synapse/pull/9855.

Workarounds

There are no known workarounds.

References

n/a

For more information

If you have any questions or comments about this advisory, email us at [email protected].

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`matrix-synapse`	all versions	1.33.0`pip install --upgrade 'matrix-synapse==1.33.0'`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for matrix-synapse, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update matrix-synapse to 1.33.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7h5v-85w9-pq6c is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Impact Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. ### Patches The issue is fixed by https://github.com/matrix-org/synapse/pull/9855. ### Workarounds There are no known workarounds. ### References n/a ### For more information If you have any questions or comments about this advisory, email us at [email protected].

O3 Security · Impact-Aware SCA

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