vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-48142

NGINX ngx_http_charset_module vulnerability

MEDIUM
4.8
CVSS Score
Published: June 17, 2026 at 02:04 PM UTC
Updated: August 11, 2026 at 03:03 PM UTC
7 products affected across 1 vendorNGINX PlusNGINX Open SourceNGINX Ingress Controller

Using NGINX Open Source by F5?

Get instant alerts when new vulnerabilities affect NGINX Open Source - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM4.8
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their control) to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Dos· F5
95%
4.3.0 ≤ v ≤ 4.7.04.9.0
NGINX Gateway Fabric· F5
95%
1.3.0 ≤ v ≤ 1.6.22.0.0 ≤ v ≤ 2.6.3
NGINX Ingress Controller· F5
95%
3.5.0 ≤ v ≤ 3.7.24.0.0 ≤ v ≤ 4.0.15.0.0 ≤ v ≤ 5.5.0
NGINX Instance Manager· F5
95%
2.17.0 ≤ v ≤ 2.22.0
NGINX Open Source· F5
95%
1.0.0 ≤ v ≤ 1.30.21.13.10 ≤ v < 1.31.21.30.0 ≤ v < 1.30.31.31.0 ≤ v ≤ 1.31.11.13.101.30.0
Affected range stops below 1.30.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.31.2, so it looks safe — our inference, not a vendor statement
NGINX Plus· F5
95%
37.0 ≤ v < 37.0.2.137.0.0.1 ≤ v < 37.0.2.1R36 ≤ v < R36 P6r33 ≤ v < r3637.0R36r36r36 p1r36 p2r36 p3r36 p4r36 p5
Affected range stops below 37.0.2.1, so it looks safe — our inference, not a vendor statement
Affected range stops below R36 P6, so it looks safe — our inference, not a vendor statement
Affected range stops below r36, so it looks safe — our inference, not a vendor statement
Waf· F5
95%
4.10.0 ≤ v ≤ 4.16.05.2.0 ≤ v ≤ 5.8.05.9.0 ≤ v ≤ 5.13.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://my.f5.com/manage/s/article/K000161585

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMf5
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-125

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card