CVE-2025-14523

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2025-12-11. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.2Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
40.1%
KEV
Not listed

Published

December 11, 2025

Last Modified

June 29, 2026

Advisory Details (10)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:0908
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:0907
redhat Patch Available

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

https://access.redhat.com/errata/RHSA-2026:0906
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP So

https://access.redhat.com/errata/RHSA-2026:0905
redhat Patch Available

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

https://access.redhat.com/errata/RHSA-2026:0868
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Serv

https://access.redhat.com/errata/RHSA-2026:0867
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:0836
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:0423
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:0422
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:0421

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatspice-client-win-0:8.10-6.el8_6.12026-01-29redhat
redhatspice-client-win-0:8.10-6.el8_2.12026-01-29redhat
redhatspice-client-win-0:8.10-6.el8_4.12026-01-29redhat
redhatspice-client-win-0:8.10-6.el8_8.12026-01-29redhat
redhatspice-client-win-0:8.10-6.el8_10.12026-01-28redhat
redhatlibsoup-0:2.72.0-8.el9_4.82026-01-21redhat
redhatlibsoup-0:2.62.3-2.el8_4.72026-01-21redhat
redhatlibsoup-0:2.62.3-1.el8_2.72026-01-21redhat
redhatlibsoup-0:2.62.3-2.el8_6.72026-01-21redhat
redhatlibsoup-0:2.72.0-8.el9_0.82026-01-21redhat
redhatlibsoup-0:2.72.0-10.el9_6.52026-01-21redhat
redhatlibsoup-0:2.62.2-10.el7_92026-01-21redhat
redhatlibsoup3-0:3.6.5-3.el10_0.112026-01-20redhat
redhatlibsoup-0:2.62.3-3.el8_8.72026-01-20redhat
redhatlibsoup-0:2.72.0-8.el9_2.82026-01-20redhat
redhatlibsoup-0:2.72.0-12.el9_7.32026-01-12redhat
redhatlibsoup-0:2.62.3-11.el8_102026-01-12redhat
redhatlibsoup3-0:3.6.5-3.el10_1.82026-01-12redhat

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(1)

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

All Vendor Advisories

(18)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 42× 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.

Showing the most recent 100 of 118 total refreshes for this CVE.

  1. 2026-07-23 02:49 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-14523?
CVE-2025-14523 is a high vulnerability published on December 11, 2025. A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the…
When was CVE-2025-14523 disclosed?
CVE-2025-14523 was first published in the National Vulnerability Database on December 11, 2025, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-14523 actively exploited?
CVE-2025-14523 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-14523?
CVE-2025-14523 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2025-14523?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-14523, 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

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