Medium severity5.5GHSA Advisory· Published May 28, 2026· Updated Jun 3, 2026
CVE-2026-45078
CVE-2026-45078
Description
Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 1.152.1 | 1.152.1 |
Affected products
4- Range: < 1.152.1
- osv-coords3 versionspkg:apk/chainguard/synapsepkg:pypi/matrix-synapsepkg:rpm/opensuse/matrix-synapse&distro=openSUSE%20Tumbleweed
< 1.153.0-r0+ 2 more
- (no CPE)range: < 1.153.0-r0
- (no CPE)range: < 1.152.1
- (no CPE)range: < 1.153.0-2.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-8q93-326v-3m7gghsaADVISORY
- github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7gnvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-45078ghsaADVISORY
- github.com/element-hq/synapse/commit/3f58bc50dfba5768ee43ce48c5e74c25ba0b078aghsaWEB
- github.com/element-hq/synapse/issues/19394ghsaWEB
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2026-191.yamlghsaWEB
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