NGINX Open Source: Out-of-bounds Read
CVE-2026-32647 is a high-severity out-of-bounds read vulnerability in NGINX Open Source from F5, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 1.29.7, 1.28.3 as the first without the flaw, so updating NGINX Open Source to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.95% chance of exploitation within 30 days, higher than 62% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update NGINX Open Source to 1.29.7 or 1.28.3, whichever matches your release line, or a later version.
- Update NGINX Plus to R36 P3 or R35 P2 or R32 P5, whichever matches your release line, or a later version.
- Read the advisory on my.f5.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| F5 | NGINX Open Source | 1.29.0 up to, but not including, 1.29.7; 1.1.19 up to, but not including, 1.28.3 | 1.29.7, 1.28.3 |
| F5 | NGINX Plus | R36 up to, but not including, R36 P3; R35 up to, but not including, R35 P2; R34 and later; R33 and later; R32 up to, but not including, R32 P5 | R36 P3, R35 P2, R32 P5 |
| Red Hat | Red Hat Enterprise Linux 10 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 8 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | Not specified in the record | Not stated |
| Red Hat | Red Hat Hardened Images | Not specified in the record | Not stated |
| Red Hat | Red Hat Update Infrastructure 5 | Not specified in the record | Not stated |
| Red Hat | Red Hat Lightspeed proxy 1 | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (f5.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.5 | High | CNA (f5.com) |
| CVSS 3.1 | 7.8 | High | CNA (f5.com) |
| CVSS 3.1 | 7.8 | High | CNA |
Official description
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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other references
- 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
Other vulnerabilities in NGINX Open Source
- 8.1 High severity
- 8.1 High severity
- 8.1 High severity
- 8.2 High severity
- 8.1 High severity
- 8.1 High severity
Recent Out-of-bounds Read vulnerabilities
- 8.1 High severity
- 9.3 Critical severity
- 8.4 High severity
- 8.8 High severity
- 8.8 High severity
- 7.5 High severity
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