How severe is CVE-2026-49821?

CVE-2026-49821 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-49821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-49821?

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-2026-49821 have an EU (EUVD) identifier?

Yes. CVE-2026-49821 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36094.

When was CVE-2026-49821 published?

CVE-2026-49821 was published on 2026-06-10 and last updated on 2026-06-17.

CVE-2026-49821

CVE-2026-49821 is a high-severity vulnerability with a CVSS 3.x base score of 7.7. 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-441.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36094
Weakness: CWE-441
Published: 2026-06-10
Last modified: 2026-06-17

Description

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, Fission's buildermgr controller processed Package CRDs without verifying that Package.spec.environment.namespace matched Package.metadata.namespace. This issue has been patched in version 1.24.0.

Frequently asked questions

What is CVE-2026-49821?: Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, Fission's buildermgr controller processed Package CRDs without verifying that Package.spec.environment.namespace matched Package.metadata.namespace. This issue has been patched in version 1.24.0.
How severe is CVE-2026-49821?: CVE-2026-49821 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-49821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-49821?: 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-2026-49821 have an EU (EUVD) identifier?: Yes. CVE-2026-49821 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36094.
When was CVE-2026-49821 published?: CVE-2026-49821 was published on 2026-06-10 and last updated on 2026-06-17.

References

Other CWE-441 vulnerabilities

CVE-2026-39906 — Critical (CVSS 10.0): Unisys WebPerfect Image Suite versions 3.0.3960.22810 and 3.0.3960.22604 expose a deprecated .NET Remoting TCP channel…
CVE-2025-62718 — Critical (CVSS 9.9): Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.0 and 0.31.0, Axios does not correctly…
CVE-2025-64123 — Critical (CVSS 9.8): Unintended Proxy or Intermediary vulnerability in Nuvation Energy Multi-Stack Controller (MSC) allows Network Boundary…
CVE-2021-20042 — Critical (CVSS 9.8): An unauthenticated remote attacker can use SMA 100 as an unintended proxy or intermediary undetectable proxy to bypass…
CVE-2025-64125 — Critical (CVSS 9.4): A vulnerability in Nuvation Energy nCloud VPN Service allowed Network Boundary Bridging.This issue affected the nCloud…
CVE-2026-24471 — Critical (CVSS 9.3): continuwuity is a Matrix homeserver written in Rust. This vulnerability allows an attacker with a malicious remote…

Browse all CWE-441 vulnerabilities →