8.7

CVE-2026-78222: f5 nginx javascript NULL Pointer Dereference

CVSS: 8.7v4.0HighAwaiting analysis
AliasesUBUNTU-CVE-2026-78222DEBIAN-CVE-2026-78222
Published 02-09-2026Last modified 02-09-2026
Open JSON

Vulnerability summary

CVE-2026-78222 is a high (CVSS 8.7) NULL Pointer Dereference vulnerability in f5 nginx javascript. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.8% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.62%
0%100%
Low · +0.25 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-09-2026
    PublishedVulnerability first disclosed.
  2. 02-09-2026
    Last modifiedVulnerability information updated.

Description

A vulnerability exists in NGINX JavaScript where a malformed HTTP response received by ngx.fetch() can crash an NGINX worker when trusted JavaScript reads Response.statusText. Exploitation requires control or influence over the fetched HTTP response. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.62%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

+0.25 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.62%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • libnginx-mod-jsAll versions (No fix recorded) | < 1.0.1-1
F51 product
Ubuntu1 product
  • libnginx-mod-jsAll versions (No fix recorded)

3 vendors · 3 products

References

5 links