7.5

CVE-2026-22036: Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion

Modified
AliasesUBUNTU-CVE-2026-22036DEBIAN-CVE-2026-22036CGA-6f7j-jf4c-849p
Published 14-01-2026Last modified 22-01-2026

Vulnerability summary

CVE-2026-22036 is a high (CVSS 7.5) vulnerability in nodejs undici. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 39.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.46%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 14
OPENSUSE-SU-2026:10074-1OPENSUSE-SU-2026:11110-1OPENSUSE-SU-2026:20236-1SUSE-SU-2026:0295-1SUSE-SU-2026:0301-1SUSE-SU-2026:0435-1

Timeline

  1. 14-01-2026
    PublishedVulnerability first disclosed.
  2. 22-01-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.46% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard18 products
  • code-server< 4.106.3-r2
  • gemini-cli< 0.49.0-r4
  • jitsucom-jitsu-console< 2.11.0-r12
  • jitsucom-jitsu-rotor< 2.11.0-r12
  • kibana-8.19< 8.19.10-r2
Wolfi5 products
  • code-server< 4.106.3-r2
  • jitsucom-jitsu-console< 2.11.0-r12
  • jitsucom-jitsu-rotor< 2.11.0-r12
  • langfuse-3-worker< 3.146.0-r2
  • renovate< 42.92.4-r0 | < 42.94.1-r2
Debian1 product
  • node-undiciAll versions (No fix recorded) | < 7.18.2+dfsg+~cs3.2.0-1
Nodejs1 product
  • undici< 6.23.0 | ≥ 7.0.0, < 7.18.2
Npm1 product
  • undici≥ 7.0.0, < 7.18.2 | < 6.23.0
Opensuse1 product
  • nodejs24&distro=openSUSE Tumbleweed< 24.13.0-2.1
Ubuntu1 product
  • node-undiciAll versions (No fix recorded)

7 vendors · 28 products

References

9 links