Skip to main content
No exploitation reportedFix available

CVE-2026-27784

No exploitation reported by the sources we read.

  • Published2026-03-24
  • Fixed in1.29.7 · 1.28.3
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The 32-bit implementation of NGINX Open Source has a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to over-read or over-write NGINX worker memory resulting in its termination, using a specially crafted MP4 file. The issue only affects 32-bit NGINX Open Source 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.

Timeline

dates in UTC
  1. 2026-03-2415:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-27784?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-27784?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
F5 nginx open source
BranchAffectedFixed in
1.29≥ 1.29.0, < 1.29.71.29.7
1.x≥ 1.1.19, < 1.28.31.28.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • nginxAlmaLinux:9all versions · fixed in 1:1.24.0-5.module_el9.7.0+220+47ec8b91.2.alma.1and 9 other packages
  • nginxAlmaLinux:9all versions · fixed in 2:1.20.1-24.el9_7.2.alma.1and 9 other packages
  • nginxAlmaLinux:9all versions · fixed in 2:1.26.3-2.module_el9.7.0+223+9cd7031b.1and 9 other packages
  • nginxAlmaLinux:8all versions · fixed in 1:1.24.0-3.module_el8.10.0+4159+021b4a2a.alma.1and 8 other packages
  • nginx-filesystemAlmaLinux:10all versions · fixed in 2:1.26.3-2.el10_1.1and 1 other package

Vendor advisories

  • RHSA-2026:10065 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat Update Infrastructure 5.1 security update

Full record on NVD

Fix

  1. Update F5 nginx open source to 1.29.7 · 1.28.3
  2. Vendor fix Red Hat Product Security RHSA-2026:10065 · 2 productsThe container images provided by this release, apart from the installer, should be deployed using rhui-installer utility. See the official documentation for more details.
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:10065 · 4 productsMitigation 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.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-03-25
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.08.5read 2026-10-23
  • CNACVSS 3.17.8read 2026-10-23
  • NVDCVSS 3.15.5read 2026-10-23
  • CNAweakness (CWE)CWE-190read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 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
Published
2026-03-24
Last Modified
2026-07-15
NVD status
Modified

Frequently asked questions

What is CVE-2026-27784?

The 32-bit implementation of NGINX Open Source has a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to over-read or over-write NGINX worker memory resulting in its termination, using a specially crafted MP4 file. The issue only affects 32-bit NGINX Open Source 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.

Is CVE-2026-27784 actively exploited?

Active exploitation of CVE-2026-27784 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-27784?

CVE-2026-27784 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Running nginx? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database