NGINX ngx_http_dav_module vulnerability
Summary
| CVE | CVE-2026-27654 |
|---|---|
| State | PUBLISHED |
| Assigner | f5 |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-24 15:16:33 UTC |
| Updated | 2026-07-15 02:19:09 UTC |
| Description | 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 process or modification of source or destination file names outside the document root. This issue affects NGINX Open Source and NGINX Plus when the configuration file uses DAV module MOVE or COPY methods, prefix location (nonregular expression location configuration), and alias directives. The integrity impact is constrained because the NGINX worker process user has low privileges and does not have access to the entire system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. |
Risk And Classification
Primary CVSS: v4.0 8.8 HIGH from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
Problem Types: CWE-122 | CWE-120 | CWE-122 CWE-122: Heap-based Buffer Overflow | CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 8.8 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 8.8 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N |
| 3.1 | ADP | CVSS | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| 3.1 | [email protected] | Secondary | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| 3.1 | CNA | CVSS | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | F5 | Nginx Open Source | All | All | All | All |
| Application | F5 | Nginx Open Source | All | All | All | All |
| Application | F5 | Nginx Plus | r32 | p1 | All | All |
| Application | F5 | Nginx Plus | r32 | p2 | All | All |
| Application | F5 | Nginx Plus | r32 | p3 | All | All |
| Application | F5 | Nginx Plus | r32 | p4 | All | All |
| Application | F5 | Nginx Plus | r33 | All | All | All |
| Application | F5 | Nginx Plus | r33 | p1 | All | All |
| Application | F5 | Nginx Plus | r33 | p2 | All | All |
| Application | F5 | Nginx Plus | r33 | p3 | All | All |
| Application | F5 | Nginx Plus | r34 | All | All | All |
| Application | F5 | Nginx Plus | r34 | p1 | All | All |
| Application | F5 | Nginx Plus | r34 | p2 | All | All |
| Application | F5 | Nginx Plus | r35 | All | All | All |
| Application | F5 | Nginx Plus | r35 | p1 | All | All |
| Application | F5 | Nginx Plus | r36 | All | All | All |
| Application | F5 | Nginx Plus | r36 | p1 | All | All |
| Application | F5 | Nginx Plus | r36 | p2 | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | F5 | NGINX Open Source | affected 1.29.0 1.29.7 semver | Not specified |
| CNA | F5 | NGINX Open Source | affected 0.5.13 1.28.3 semver | Not specified |
| CNA | F5 | NGINX Plus | affected R36 R36 P3 custom | Not specified |
| CNA | F5 | NGINX Plus | affected R35 R35 P2 custom | Not specified |
| CNA | F5 | NGINX Plus | affected R34 * custom | Not specified |
| CNA | F5 | NGINX Plus | affected R33 * custom | Not specified |
| CNA | F5 | NGINX Plus | affected R32 R32 P5 custom | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10 | unaffected 2:1.26.3-2.el10_1.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 2:1.26.3-1.el10_0.8 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8 | unaffected 8100020260401080144.489197e6 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | unaffected 9070020260331134728.9 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | unaffected 2:1.20.1-24.el9_7.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | unaffected 9070020260407080353.9 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions | unaffected 1:1.20.1-10.el9_0.3 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions | unaffected 1:1.20.1-14.el9_2.5 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 1:1.20.1-16.el9_4.5 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 9040020260504195322.9 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 2:1.20.1-22.el9_6.5 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 9060020260504194843.9 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 9060020260504154614.9 * rpm | Not specified |
| ADP | Red Hat | Red Hat Hardened Images | unaffected 1.30.0-1.hum1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1776868774 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1776868842 * rpm | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:15945 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-27654 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:6906 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:15966 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8346 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7002 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:6923 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27654.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:15942 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| my.f5.com/manage/s/article/K000160382 | [email protected] | my.f5.com | Vendor Advisory |
| access.redhat.com/errata/RHSA-2026:13680 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10065 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13634 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:15943 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:14836 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13839 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:6907 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7343 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: F5 acknowledges Calif.io in collaboration with Claude and Anthropic Research for bringing this issue to our attention and following the highest standards of coordinated disclosure. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-03-24T15:01:19.814Z | Reported to Red Hat. |
| ADP | 2026-03-24T14:13:26.879Z | Made public. |
Solutions
ADP: RHSA-2026:13634: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
ADP: RHSA-2026:6906: Red Hat Enterprise Linux AppStream (v. 10)
ADP: RHSA-2026:6907: Red Hat Enterprise Linux AppStream (v. 8)
ADP: RHSA-2026:15942: Red Hat Enterprise Linux AppStream E4S (v.9.0)
ADP: RHSA-2026:14836: Red Hat Enterprise Linux AppStream E4S (v.9.2)
ADP: RHSA-2026:13839: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)
ADP: RHSA-2026:15943: Red Hat Enterprise Linux AppStream EUS (v.9.4)
ADP: RHSA-2026:15945: Red Hat Enterprise Linux AppStream EUS (v.9.6)
ADP: RHSA-2026:13680: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)
ADP: RHSA-2026:15966: Red Hat Enterprise Linux AppStream EUS (v.9.6)
ADP: RHSA-2026:6923: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:7002: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:7343: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:8346: Red Hat Hardened Images
ADP: RHSA-2026:10065: Red Hat Update Infrastructure 5
Workarounds
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.