CVE-2022-23643: Side-channel attack in Sourcegraph Code Monitors

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-02-15 · updated 2026-06-17
Weakness: CWE-200

Description

Sourcegraph is a code search and navigation engine. Sourcegraph versions 3.35 and 3.36 reintroduced a previously fixed side-channel vulnerabilitity in the Code Monitoring feature where strings in private source code could be guessed by an authenticated but unauthorized actor. This issue affects only the Code Monitoring feature, whereas CVE-2021-43823 also affected saved searches. A successful attack would require an authenticated bad actor to create many Code Monitors to receive confirmation that a specific string exists. This could allow an attacker to guess formatted tokens in source code, such as API keys. This issue was patched in versions 3.35.2 and 3.36.3 of Sourcegraph. Those who are unable to upgrade may disable the Code Monitor feature in their installation.

Affected products

sourcegraph: from 3.35.0 before 3.35.2; from 3.36.0 before 3.36.3 — fixed in 3.35.2, 3.36.3

How to fix

Upgrade to a fixed version: sourcegraph 3.35.2, 3.36.3. Check the vendor advisory for mitigations.

References

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