CVE-2026-27654: NGINX ngx_http_dav_module vulnerability
Noroxi assessment
Priority: Plan (action score 43/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 26.4% (FIRST EPSS); higher than 98% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: F5 NGINX Open Source 1.28.3, 1.29.7; azl3 nginx 1.28.2-1 on Azure Linux 3.0 1.28.3-1; cbl2 nginx 1.22.1-15 on CBL Mariner 2.0 1.22.1-16.
Add it to your regular patch cycle. Upgrade to F5 NGINX Open Source 1.28.3, 1.29.7; azl3 nginx 1.28.2-1 on Azure Linux 3.0 1.28.3-1; cbl2 nginx 1.22.1-15 on CBL Mariner 2.0 1.22.1-16 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- BDU:2026-04817
- ALSA-2026:6906
- ALSA-2026:6907
- ALSA-2026:6923
- ALSA-2026:7002
- ALSA-2026:7343
- openSUSE-SU-2026:10423-1
- RHSA-2026:13634
- RHSA-2026:13680
- RHSA-2026:13839
- RHSA-2026:14836
- RHSA-2026:15942
- RHSA-2026:15943
- RHSA-2026:15945
- RHSA-2026:15966
- RHSA-2026:6906
- RHSA-2026:6907
- RHSA-2026:6923
- RHSA-2026:7002
- RHSA-2026:7343
- Published
- Mar 24, 2026
- Updated
- Jul 15, 2026
- EPSS
- 26.4% · 98th percentile
- CWE
- CWE-122
Report tools
Action score
43
Plan
Add it to your regular patch cycle.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 8 / 30 · 26.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · f5
- 8.2
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is nginx on your server exposed to the internet?Run a port scan
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| f5 | nginx plus | cpe:2.3:a:f5:nginx_plus |
| f5 | nginx open source | cpe:2.3:a:f5:nginx_open_source |
Using nginx plus? Add it to your stack and be the first to know about CVEs like this one. (Nginx)
Is nginx on your server exposed to the internet?
The free port scanner finds the open ports on your server and matches the service versions it can read against known vulnerabilities. No account needed.
Run a port scanAffected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- f5 nginx open source0.5.13 and later · up to 0.9.7 inclusive
- f5 nginx open source1.29.0 and later · before 1.29.7
- f5 nginx open source1.0.0 and later · before 1.28.3
- f5 nginx plusr32
- f5 nginx plusr33
- f5 nginx plusr34
- f5 nginx plusr35
- f5 nginx plusr36
Versions reported by the vendor
Affected version ranges reported by the assigning authority (f5). Independent of NVD's CPE analysis and usually ahead of it.
F5 NGINX Open Source
- 1.29.0 and later · before 1.29.7affected · semver
- 0.5.13 and later · before 1.28.3affected · semver
F5 NGINX Plus
- R36 and later · before R36 P3affected
- R35 and later · before R35 P2affected
- R34 and lateraffected
- R33 and lateraffected
- R32 and later · before R32 P5affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | nginx-all-modules | before 2:1.26.3-2.el10_1.1 | 2:1.26.3-2.el10_1.1 |
| AlmaLinux:10 | nginx-filesystem | before 2:1.26.3-2.el10_1.1 | 2:1.26.3-2.el10_1.1 |
| AlmaLinux:8 | nginx | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-all-modules | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-filesystem | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-mod-devel | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-mod-http-image-filter | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-mod-http-perl | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-mod-http-xslt-filter | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-mod-mail | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:8 | nginx-mod-stream | before 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 |
| AlmaLinux:9 | nginx | before 2:1.20.1-24.el9_7.2.alma.1 | 2:1.20.1-24.el9_7.2.alma.1 |
| AlmaLinux:9 | nginx | before 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 |
| AlmaLinux:9 | nginx | before 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 |
| AlmaLinux:9 | nginx-all-modules | before 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 |
| AlmaLinux:9 | nginx-all-modules | before 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 |
| AlmaLinux:9 | nginx-all-modules | before 2:1.20.1-24.el9_7.2.alma.1 | 2:1.20.1-24.el9_7.2.alma.1 |
| AlmaLinux:9 | nginx-core | before 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 |
| AlmaLinux:9 | nginx-core | before 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 |
| AlmaLinux:9 | nginx-core | before 2:1.20.1-24.el9_7.2.alma.1 | 2:1.20.1-24.el9_7.2.alma.1 |
| AlmaLinux:9 | nginx-filesystem | before 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 |
| AlmaLinux:9 | nginx-filesystem | before 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 | 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1 |
| AlmaLinux:9 | nginx-filesystem | before 2:1.20.1-24.el9_7.2.alma.1 | 2:1.20.1-24.el9_7.2.alma.1 |
| AlmaLinux:9 | nginx-mod-devel | before 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 |
+96
Same product
f5: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-97205NGINX ngx_http_core_module vulnerability36Monitor
- CVE-2026-93479NGINX map directive and regex matching vulnerability36Monitor
- CVE-2026-15176NGINX ngx_http_core_module vulnerability36Monitor
Published before and after this one in the same product
- ← EarlierCVE-2024-39792Aug 14, 2024 · NGINX Plus MQTT vulnerability34Monitor
- ← EarlierCVE-2025-53859Aug 13, 2025 · NGINX ngx_mail_smtp_module vulnerability25Monitor
- Later →CVE-2026-28753Mar 24, 2026 · NGINX ngx_mail_proxy_module vulnerability25Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| F5 NGINX Open Source | 1.28.3 | Vendor (CNA) |
| F5 NGINX Open Source | 1.29.7 | Vendor (CNA) |
| azl3 nginx 1.28.2-1 on Azure Linux 3.0 | 1.28.3-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 nginx 1.22.1-15 on CBL Mariner 2.0 | 1.22.1-16 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:nginx | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nginx-all-modules | 2:1.26.3-2.el10_1.1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:nginx-core | 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:nginx-filesystem | 2:1.26.3-2.el10_1.1 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:nginx-mod-devel | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nginx-mod-http-image-filter | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nginx-mod-http-perl | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nginx-mod-http-xslt-filter | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nginx-mod-mail | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nginx-mod-stream | 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| alpine:nginx | 1.28.3-r0 · Alpine:v3.22 | Package registry (OSV) |
| debian:nginx | 1.22.1-9+deb12u5 · Debian:12 | Package registry (OSV) |
| opensuse:nginx | 1.29.7-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:nginx | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-all-modules | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-core | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-core-debuginfo | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-debuginfo | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-debugsource | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-filesystem | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-mod-http-image-filter | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-mod-http-image-filter-debuginfo | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-mod-http-perl | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-mod-http-perl-debuginfo | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| red hat:nginx-mod-http-xslt-filter | 2:1.26.3-1.el10_0.8 · Red Hat:enterprise_linux_eus:10.0 | Package registry (OSV) |
| rocky linux:nginx | 2:1.26.3-2.el10_1.1 · Rocky Linux:10 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×3
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:9 | 2026-04-06 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-06-28 |
| Proof-of-concept repository on GitHub | stars:2 | 2026-07-21 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+13 d
- TodayNov 11, 2026+232 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-15176204 days apartNGINX ngx_http_core_module vulnerability36Monitor
- CVE-2026-93479204 days apartNGINX map directive and regex matching vulnerability36Monitor
- CVE-2026-90439175 days apartNGINX ngx_http_v3_module vulnerability27Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-122 · Heap-based Buffer OverflowCVSS vector
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
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (18 more)Show less
- access.redhat.com/errata/RHSA-2026:10065
- access.redhat.com/errata/RHSA-2026:13634
- access.redhat.com/errata/RHSA-2026:13680
- access.redhat.com/errata/RHSA-2026:13839
- access.redhat.com/errata/RHSA-2026:14836
- access.redhat.com/errata/RHSA-2026:15942
- access.redhat.com/errata/RHSA-2026:15943
- access.redhat.com/errata/RHSA-2026:15945
- access.redhat.com/errata/RHSA-2026:15966
- access.redhat.com/errata/RHSA-2026:6906
- access.redhat.com/errata/RHSA-2026:6907
- access.redhat.com/errata/RHSA-2026:6923
- access.redhat.com/errata/RHSA-2026:7002
- access.redhat.com/errata/RHSA-2026:7343
- access.redhat.com/errata/RHSA-2026:8346
- access.redhat.com/security/cve/CVE-2026-27654
- bugzilla.redhat.com/show_bug.cgi?id=2450776
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27654.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.