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CVE-2022-36009

Incorrect parsing of access level in gomatrixserverlib and dendrite

HIGH
8.8
CVSS Score
Published: August 19, 2022 at 08:35 PM UTC
Updated: June 17, 2026 at 04:52 AM UTC
3 products affected across 2 vendorsDendriteGomatrixserverlibGomatrixserverlib

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

gomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. The power level parsing within gomatrixserverlib was failing to parse the `"events_default"` key of the `m.room.power_levels` event, defaulting the event default power level to zero in all cases. Power levels are the matrix terminology for user access level. In rooms where the `"events_default"` power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers. gomatrixserverlib contains a fix as of commit `723fd49` and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the `"events_default"` power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Dendrite· Matrix
95%
v ≤ 0.9.2
Gomatrixserverlib· Matrix
95%
All versions
Gomatrixserverlib· Matrix Org
60%
v < 0.9.3v < 723fd49
Affected range stops below 0.9.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 723fd49, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c
x_refsource_MISCVendor Advisory
Source: [email protected]
https://matrix.org/docs/guides/moderation/#power-levels

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863

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