How severe is CVE-2026-22036?

CVE-2026-22036 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-22036 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22036?

CVE-2026-22036 affects Nodejs Undici. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22036?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-22036 have an EU (EUVD) identifier?

Yes. CVE-2026-22036 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2422.

When was CVE-2026-22036 published?

CVE-2026-22036 was published on 2026-01-14 and last updated on 2026-06-17.

CVE-2026-22036

CVE-2026-22036 is a medium-severity vulnerability in Nodejs Undici with a CVSS 3.x base score of 5.9. 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2422
Weakness: CWE-770
Affected product: Nodejs Undici
Published: 2026-01-14
Last modified: 2026-06-17

Description

Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.

Frequently asked questions

What is CVE-2026-22036?: Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.
How severe is CVE-2026-22036?: CVE-2026-22036 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-22036 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22036?: CVE-2026-22036 affects Nodejs Undici. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22036?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-22036 have an EU (EUVD) identifier?: Yes. CVE-2026-22036 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2422.
When was CVE-2026-22036 published?: CVE-2026-22036 was published on 2026-01-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*

More vulnerabilities in Nodejs Undici

CVE-2026-6734 — High (CVSS 7.5): Impact: When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without verifying…
CVE-2026-9675 — High (CVSS 7.5): Impact: The undici WebSocket client enforces maxPayloadSize per-frame but does not enforce the cumulative size of…
CVE-2026-12151 — High (CVSS 7.5): Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but…
CVE-2026-2229 — High (CVSS 7.5): ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of…
CVE-2026-1528 — High (CVSS 7.5): ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's…
CVE-2026-1526 — High (CVSS 7.5): The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during…

All CVEs affecting Nodejs Undici →

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities

CVE-2026-31283 — Critical (CVSS 9.8): In Totara LMS v19.1.5 and before, the forgot password API does not implement rate limiting for the target email…
CVE-2020-37067 — Critical (CVSS 9.8): Filetto 1.0 FTP server contains a denial of service vulnerability in the FEAT command processing that allows attackers…
CVE-2021-47875 — Critical (CVSS 9.8): GeoGebra CAS Calculator 6.0.631.0 contains a denial of service vulnerability that allows attackers to crash the…
CVE-2025-11832 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling vulnerability in Azure Access Technology BLU-IC2, Azure Access…
CVE-2024-44241 — Critical (CVSS 9.8): The issue was addressed with improved bounds checks. This issue is fixed in iOS 18.1 and iPadOS 18.1, macOS Sequoia…
CVE-2022-3439 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling in GitHub repository ikus060/rdiffweb prior to 2.5.0.

Browse all CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities →