How severe is CVE-2026-29779?

CVE-2026-29779 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-29779 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29779?

CVE-2026-29779 affects Lyc8503 Uptimeflare. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29779?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-29779 have an EU (EUVD) identifier?

Yes. CVE-2026-29779 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10152.

When was CVE-2026-29779 published?

CVE-2026-29779 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-29779

CVE-2026-29779 is a high-severity vulnerability in Lyc8503 Uptimeflare with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10152
Weakness: CWE-200
Affected product: Lyc8503 Uptimeflare
Published: 2026-03-07
Last modified: 2026-06-17

Description

UptimeFlare is a serverless uptime monitoring & status page solution, powered by Cloudflare Workers. Prior to commit 377a596, configuration file uptime.config.ts exports both pageConfig (safe for client use) and workerConfig (server-only, contains sensitive data) from the same module. Due to pages/incidents.tsx importing and using workerConfig directly inside client-side component code, the entire workerConfig object was included in the client-side JavaScript bundle served to all visitors. This issue has been patched via commit 377a596.

Frequently asked questions

What is CVE-2026-29779?: UptimeFlare is a serverless uptime monitoring & status page solution, powered by Cloudflare Workers. Prior to commit 377a596, configuration file uptime.config.ts exports both pageConfig (safe for client use) and workerConfig (server-only, contains sensitive data) from the same module. Due to pages/incidents.tsx importing and using workerConfig directly inside client-side component code, the entire workerConfig object was included in the client-side JavaScript bundle served to all visitors. This issue has been patched via commit 377a596.
How severe is CVE-2026-29779?: CVE-2026-29779 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-29779 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29779?: CVE-2026-29779 affects Lyc8503 Uptimeflare. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29779?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-29779 have an EU (EUVD) identifier?: Yes. CVE-2026-29779 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10152.
When was CVE-2026-29779 published?: CVE-2026-29779 was published on 2026-03-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lyc8503:uptimeflare:*:*:*:*:*:*:*:*

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