CVE-2022-31052

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 27% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for. Remote users are not able to exploit this directly, because the URL preview endpoint is authenticated. Deployments with url_preview_enabled: false set in configuration are not affected. Deployments with url_preview_enabled: true set in configuration are affected. Deployments with no configuration value set for url_preview_enabled are not affected, because the default is false. Administrators of homeservers with URL previews enabled are advised to upgrade to v1.61.1 or higher. Users unable to upgrade should set url_preview_enabled to false.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
72.6%
KEV
Not listed

Published

June 28, 2022

Last Modified

November 21, 2024

References (10)

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
matrix-synapse0.33.5 ... 1.9.1 (259 versions)1.61.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:25 UTCEPSS rescore
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  3. 2026-07-09 19:07 UTCEPSS rescore
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  18. 2026-06-29 03:02 UTCOSV refresh
  19. 2026-06-28 14:06 UTCEPSS rescore
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  1. 2026-06-23 21:31 UTCEPSS rescore
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  11. 2026-06-18 17:51 UTCEPSS rescore
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  22. 2026-06-11 22:52 UTCOSV refresh
  23. 2026-06-11 13:58 UTCEPSS rescore
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  25. 2026-06-10 22:16 UTCEPSS rescore
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  43. 2026-06-01 13:50 UTCEPSS rescore
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  45. 2026-05-31 22:29 UTCEPSS rescore
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  50. 2026-05-29 13:43 UTCEPSS rescore
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  60. 2026-05-26 07:17 UTCEPSS rescore
  61. 2026-05-25 19:43 UTCEG score recompute

Frequently asked(5)

What is CVE-2022-31052?
CVE-2022-31052 is a medium vulnerability published on June 28, 2022. Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request…
When was CVE-2022-31052 disclosed?
CVE-2022-31052 was first published in the National Vulnerability Database on June 28, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-31052 actively exploited?
CVE-2022-31052 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-31052?
CVE-2022-31052 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2022-31052?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-31052, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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