CVE-2026-27654

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-03-24. the CNA's CVSS baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:github_m, ghsa
Elevated
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 22%CVSS: 8.2Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
97.3%
KEV
Not listed

Published

March 24, 2026

Last Modified

June 30, 2026

Advisory Details (10)

Auto-updated Jun 30, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:15966
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:15945
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:15943
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:15942
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:14836
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:13839
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:13680
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:13634
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10065
generic

myF5

https://my.f5.com/manage/s/article/K000160382

Vendor Advisories for CVE-2026-27654(7)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.10.3-0ubuntu0.16.04.5+esm7) @ xenial2026-06-30ubuntu
redhatnginx:1.24-9060020260504194843.92026-05-11redhat
redhatnginx:1.24-9040020260504195322.92026-05-11redhat
redhatnginx-1:1.20.1-10.el9_0.32026-05-11redhat
redhatnginx:1.26-9060020260504154614.92026-05-11redhat
redhatnginx-1:1.20.1-14.el9_2.52026-05-07redhat
redhatnginx-2:1.26.3-1.el10_0.82026-05-05redhat
redhatnginx-2:1.20.1-22.el9_6.52026-05-05redhat
redhatnginx-1:1.20.1-16.el9_4.52026-05-05redhat
redhatrhui5/rhua-rhel9:17768688422026-04-23redhat
redhatnginx-main-1.30.0-1.hum12026-04-15redhat
redhatnginx:1.26-9070020260407080353.92026-04-09redhat
redhatnginx-2:1.20.1-24.el9_7.22026-04-08redhat
redhatnginx:1.24-8100020260401080144.489197e62026-04-07redhat
redhatnginx:1.24-9070020260331134728.92026-04-07redhat
redhatnginx-2:1.26.3-2.el10_1.12026-04-07redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(11)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-13 22:30 UTCEPSS rescore
  2. 2026-07-13 06:13 UTCEPSS rescore
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-12 05:46 UTCEPSS rescore
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-09 19:10 UTCEPSS rescore
  7. 2026-07-08 15:15 UTCEPSS rescore
  8. 2026-07-07 13:46 UTCEPSS rescore
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-01 15:06 UTCEPSS rescore
  15. 2026-07-01 15:06 UTCEPSS rescore
  16. 2026-06-30 23:22 UTCEPSS rescore
  17. 2026-06-30 23:22 UTCEPSS rescore
  18. 2026-06-30 04:32 UTCNVD updateCVSS v4 → 8.8
  19. 2026-06-30 04:31 UTCEG score recompute
  20. 2026-06-30 04:31 UTCVendor advisory
  21. 2026-06-30 04:31 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCJohannesLks/CVE-2026-27654
    First seen Apr 6, 2026

    NGINX `ngx_http_dav_module` Heap Buffer Overflow via `size_t` Underflow (Remote DoS / Potential RCE)

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-27654?
CVE-2026-27654 is a high vulnerability published on March 24, 2026. NGINX Open Source and NGINX Plus have a vulnerability in the ngxhttpdav_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…
When was CVE-2026-27654 disclosed?
CVE-2026-27654 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27654 actively exploited?
CVE-2026-27654 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-27654?
CVE-2026-27654 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-27654?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27654, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-27654

Explore →

Is Your Infrastructure Affected by CVE-2026-27654?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs