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?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

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: 0.000 (6.0th 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 Plus — versions R36, R35, R34

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

JohannesLks/CVE-2026-27654

References

my.f5.com/manage/s/article/K000160382 (vendor-advisory)

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?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.