NVD / CVE Program· CNA f5

CVE-2026-32647: NGINX ngx_http_mp4_module vulnerability

Noroxi assessment

Priority: Monitor (action score 34/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.93% (FIRST EPSS); higher than 60.4% of all records.
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
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.

Low priority for now. 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_mp4_module module, which might allow an attacker to trigger a buffer over-read or over-write to the NGINX worker memory resulting in its termination or possibly code execution, using a specially crafted MP4 file. This issue affects NGINX Open Source and NGINX Plus if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

HighCVSS 8.5 · v4.0—No exploit Fix available

Memory safety

Published: Mar 24, 2026
Updated: Jul 15, 2026
EPSS: 0.9% · 60th percentile
CWE: CWE-125

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 34 / 40 · 8.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.9%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · f5: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
No public exploit code on record
A fix has been released

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Noroxi 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.

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Affected 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

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

f5 nginx open source1.1.19 and later · before 1.28.3
f5 nginx open source1.29.0 and later · before 1.29.7
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
- 1.1.19 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.

+96

Same product

f5: all records

Other highest-scoring records for the same primary product.

CVE-2026-27654NGINX ngx_http_dav_module vulnerability
43Plan
CVE-2026-97205NGINX ngx_http_core_module vulnerability
36Monitor
CVE-2026-93479NGINX map directive and regex matching vulnerability
36Monitor

Published before and after this one in the same product

← EarlierCVE-2026-28753Mar 24, 2026 · NGINX ngx_mail_proxy_module vulnerability
25Monitor
← EarlierCVE-2026-28755Mar 24, 2026 · NGINX ngx_stream_ssl_module vulnerability
21Monitor
Later →CVE-2026-90439Sep 15, 2026 · NGINX ngx_http_v3_module vulnerability
27Monitor

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

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

EPSS, last 120 days

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 researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

F5 acknowledges Xint Code and Pavel Kohout (Aisle Research) for bringing this issue to our attention and following the highest standards of coordinated disclosure.reporter

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2025-53859223 days apartNGINX ngx_mail_smtp_module vulnerability
25Monitor

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

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: X

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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

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)

Overread BuffersCAPEC-540likelihood: Low · High

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

For records you follow, these changes also arrive as notifications. →

References

my.f5.com/manage/s/article/K000160366

Show all references (18 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records