- Description
- 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.
- Source
- f5sirt@f5.com
- NVD status
- Analyzed
- Products
- njs
CVSS 4.0
- Type
- Secondary
- Base score
- 9.2
- Impact score
- -
- Exploitability score
- -
- Vector string
- CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity
- CRITICAL
CVSS 3.1
- Type
- Primary
- Base score
- 9.8
- Impact score
- 5.9
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity
- CRITICAL
- f5sirt@f5.com
- CWE-122
- Hype score
- Not currently trending
03:03 UTC: CVE-2026-8711 disclosed. F5 warns of a critical 9.2 CVSS flaw (CVE-2026-8711) in NGINX JavaScript (njs). Unauthenticated attackers can trigger he
@lyrie_ai
7 Jun 2026
40 Impressions
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1 Reply
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🚨 HIGH: CVE-2026-8711 (CVSS 8.1) - NGINX JavaScript heap buffer overflow via js_fetch_proxy directive. Unauthenticated remote exploitation possible. Code execution on systems w/o ASLR. Patch immediately. #CVE #Vulnerability #PatchNow https://t.co/8Ge5MVH42A
@DFIR_Lab
30 May 2026
51 Impressions
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NGINX njs の CVE-2026-8711 が FIX：ヒープバッファ・オーバーフローによる DoS 攻撃の可能性 https://t.co/NSFL2X0rhn この NGINX の脆弱性 CVE-2026-8711 は、クライアントから送られてくるリクエストを処理する仕組みが原因で
@iototsecnews
27 May 2026
91 Impressions
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1/ lagi iseng googling nginx, eh malah nemuin berita ada 2 CVE critical baru 😅 CVE-2026-42945 (NGINX Rift) & CVE-2026-8711 keduanya CVSS 9.2 — alias critical langsung cek server production 🧵
@r00teen
21 May 2026
57 Impressions
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2 Likes
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2 Replies
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NGINX njs の CVE-2026-8711（CVSS 9.2）を解説 同日公開の NGINX Rift（CVE-2026-42945）と比較すると影響範囲の違いが重要です。 ・影響は 3 条件が AND で揃った場合のみ ・修正版: njs 0.9.9 以降へ更新 ・NGINX Rift（PoC 公開・
@MyTechBlogJP
20 May 2026
115 Impressions
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[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:f5:njs:*:*:*:*:*:*:*:*",
"matchCriteriaId": "7633C9E9-64FC-4ADC-AFF3-8397DFD04870",
"versionEndExcluding": "0.9.9",
"versionStartIncluding": "0.9.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
]