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Public proof of conceptFix available

CVE-2026-27654

A public proof of concept exists; no exploitation attested.

  • Published2026-03-24
  • WeaknessCWE-120 · CWE-122

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

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.

Timeline

dates in UTC
  1. 2026-03-2415:16CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub
  3. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2026-27654?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-27654?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
F5 nginx plus
BranchAffectedFixed in
—= r32no fix published
—= r33no fix published
—= r34no fix published
—= r35no fix published
—= r36no fix published
F5 nginx open source
BranchAffectedFixed in
1.29≥ 1.29.0, < 1.29.71.29.7
1.x≥ 1.0.0, < 1.28.31.28.3
0.x≥ 0.5.13, ≤ 0.9.7no fix published

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.

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. 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.
  2. 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

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedJohannesLks/CVE-2026-27654dead-lamer/CVE-2026-27654Debajyoti0-0/CVE-2026-27654-PoC
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-03-24
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.08.8read 2026-10-23
  • CNACVSS 3.18.2read 2026-10-23
  • CNAweakness (CWE)CWE-120, CWE-122read 2026-10-23
  • FIRST EPSSEPSS score25.9 %read 2026-10-23
  • PoC-in-GitHubproof of concept3read 2026-10-23

Technical details

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

Frequently asked questions

What is CVE-2026-27654?

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.

Is CVE-2026-27654 actively exploited?

Active exploitation of CVE-2026-27654 has not been confirmed. Its EPSS score was 25.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-27654?

CVE-2026-27654 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

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