Buffer overflow in F5 Nginx Open Source
CVE-2026-27654
NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker…
Vulnerability class: Buffer Overflow
EPSS: 0.216 (97.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
Affected products
- F5 Nginx Open Source — versions 1.29.0, 0.5.13
- F5 Nginx_open_source
- F5 Nginx Plus — versions R36, R35, R34
- F5 Nginx_plus — versions r32, r33, r34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- f5sirt@f5.com (vendor-advisory, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-27654?
- CVE-2026-27654 is a high-severity vulnerability in F5 Nginx Open Source, classified under Heap-based Buffer Overflow. CVSS score: 8.2/10. Published 2026-03-24.
- How severe is CVE-2026-27654?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2026-27654 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.