TI-2026-07654 Aliases CVE-2026-8711 GHSA-pj32-6rxc-gcmq

NGINX JavaScript vulnerability

MEDIUM 54CWE-122Published 2026-05-19 · Updated 2026-05-21

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Attack requirements: Present
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

NGINX JavaScript has a vulnerability when the js_fetch_proxy directive is configured with at least one client-controlled NGINX variable (for example, $http_*, $arg_*, $cookie_*) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.09686 95th percentileScored 2026-11-07

Fix Partial NGINX JavaScript (F5): 0.9.9Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
F5	NGINX JavaScript	0.9.4 to before 0.9.9	0.9.9	Patch available	CNA

NGINX JavaScript VendorF5 Affected 0.9.4 to before 0.9.9 Fixed in 0.9.9 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:f5:njs::::::::	0.9.4 to before 0.9.9	Vulnerable	F5

cpe:2.3:a:f5:njs:*:*:*:*:*:*:*:* Versions 0.9.4 to before 0.9.9 Vulnerable ·F5

Remediation

Fix · CNA NGINX JavaScript (F5) Fixed in 0.9.9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	—
Red Hat Enterprise Linux 8	Affected	—
Red Hat Enterprise Linux 9	Affected	—

Not affected: 1 product

Red Hat Hardened Images

Timeline

2026-10-02 Threatist record created from CVE-2026-8711
2026-10-03 Alias added: GHSA-pj32-6rxc-gcmq
2026-10-25 EPSS moved to the 95th–99th percentile
2026-11-06 Affected versions changed · Red Hat
2026-11-06 CVSS score added · Red Hat

References

Advisory 1

https://my.f5.com/manage/s/article/K000161307

TI-2022-21129 Nginx NJS v0.7.2 was discovered to contain a heap-use-after-free bug caused by illegal… CVSS 3.1CRITICAL 9.8
TI-2020-13678 Buffer Overflow found in Nginx NJS allows a remote attacker to execute arbitrary code via… CVSS 3.1CRITICAL 9.8
TI-2020-13676 Buffer Overflow vulnerabilty found in Nginx NJS v.0feca92 allows a remote attacker to… CVSS 3.1CRITICAL 9.8
TI-2023-12380 Nginx NJS v0.7.10 was discovered to contain a segmentation violation via the function… CVSS 3.1HIGH 7.5
TI-2023-12378 Nginx NJS v0.7.10 was discovered to contain a segmentation violation via the function… CVSS 3.1HIGH 7.5
TI-2023-12377 Nginx NJS v0.7.10 was discovered to contain a segmentation violation via the function… CVSS 3.1HIGH 7.5

See all 39 →

Sources

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