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Fencer Vulns
high 8.2

CVE-2025-14523 json

Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)

published 2025-12-11 10 mo ago modified 2026-11-04 4 d ago also EUVD-2025-202685

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.8
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.11
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.62.2-10.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:2.62.3-11.el8_10, 0:8.10-6.el8_10.1
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:2.62.3-1.el8_2.7, 0:8.10-6.el8_2.1
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.62.3-2.el8_4.7, 0:8.10-6.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.62.3-2.el8_4.7, 0:8.10-6.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.62.3-2.el8_6.7, 0:8.10-6.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:2.62.3-2.el8_6.7, 0:8.10-6.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:2.62.3-2.el8_6.7, 0:8.10-6.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.62.3-3.el8_8.7, 0:8.10-6.el8_8.1
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.62.3-3.el8_8.7, 0:8.10-6.el8_8.1
  • Red Hat Red Hat Enterprise Linux 9 0:2.72.0-12.el9_7.3
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.72.0-8.el9_0.8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.72.0-8.el9_2.8
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.72.0-8.el9_4.8
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.72.0-10.el9_6.5
  • spice-client-win RHEL 8 8.10-6.el8_10.1
  • spice-client-win-x64 RHEL 8 8.10-6.el8_10.1
  • spice-client-win-x86 RHEL 8 8.10-6.el8_10.1
  • libsoup RHEL 9 2.72.0-12.el9_7.3
  • libsoup3 RHEL 10.1 3.6.5-3.el10_1.8
  • libsoup RHEL 8 2.62.3-11.el8_10
  • spice-client-win RHEL 8.2 AUS 8.10-6.el8_2.1
  • spice-client-win-x64 RHEL 8.2 AUS 8.10-6.el8_2.1

red hat advisories RHSA-2026:1571RHSA-2026:1572RHSA-2026:1569RHSA-2026:1570RHSA-2026:1509RHSA-2026:0925

  • libsoup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 2.74.3-150400.3.40.1
  • libsoup SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.6.6-160000.1.1
  • libsoup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 2.74.2-150400.3.19.1
  • libsoup SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 3.4.4-150600.3.28.1
  • libsoup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 2.74.3-150600.4.19.1
  • libsoup SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 3.0.4-150400.3.28.1
  • libsoup Linux Micro 6.1 3.4.4-slfo.1.1_6.1
  • libsoup SLE Micro 5.2 2.68.4-150200.4.19.1

suse advisories SUSE-SU-2026:3936-1SUSE-SU-2026:20752-1SUSE-SU-2026:20902-1SUSE-SU-2026:0258-1SUSE-SU-2026:0257-1SUSE-SU-2026:0253-1

  • libsoup openSUSE Leap 16.0 3.6.6-160000.1.1
  • libsoup2 openSUSE Leap 16.0 2.74.3-160000.4.1
  • libsoup openSUSE Tumbleweed 3.6.5-10.1
  • libsoup2 openSUSE Tumbleweed 2.74.3-13.1

opensuse advisories openSUSE-SU-2026:20384-1openSUSE-SU-2026:20354-1openSUSE-SU-2026:10023-1openSUSE-SU-2026:10024-1

  • libsoup AlmaLinux 8 2.62.3-11.el8_10
  • libsoup AlmaLinux 9 2.72.0-12.el9_7.3

almalinux advisories ALSA-2026:0421ALSA-2026:0422

  • spice-client-win Rocky Linux 8 8.10-6.el8_10.1
  • libsoup3 Rocky Linux 10 3.6.5-3.el10_1.8
  • libsoup Rocky Linux 9 2.72.0-12.el9_7.3
  • libsoup Rocky Linux 8 2.62.3-11.el8_10

rocky linux advisories RLSA-2026:1509RLSA-2026:0423RLSA-2026:0422RLSA-2026:0421

  • libsoup Azure Linux 3.0 3.4.4-12

azure linux advisories AZL-72292

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-14523 updated cvss 8.2

libsoup: libsoup: Duplicate Host Header Handling Causes Host-Parsing Discrepancy (First- vs Last-Value Wins)

  • Red Hat Enterprise Linux 6 libsoup
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) spice-client-win 8.10-6.el8_10.1, spice-client-win-x64 8.10-6.el8_10.1, spice-client-win-x86 8.10-6.el8_10.1
    fixed: vendor fix RHSA-2026:0421
  • Red Hat Enterprise Linux AppStream (v. 9) libsoup 2.72.0-12.el9_7.3
    fixed: vendor fix RHSA-2026:0422
  • Red Hat Enterprise Linux AppStream (v. 10) libsoup3 3.6.5-3.el10_1.8
    fixed: vendor fix RHSA-2026:0423
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) spice-client-win 8.10-6.el8_2.1, spice-client-win-x64 8.10-6.el8_2.1, spice-client-win-x86 8.10-6.el8_2.1
    fixed: vendor fix RHSA-2026:0911
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) spice-client-win 8.10-6.el8_4.1, spice-client-win-x64 8.10-6.el8_4.1, spice-client-win-x86 8.10-6.el8_4.1
    fixed: vendor fix RHSA-2026:0909
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) spice-client-win 8.10-6.el8_6.1, spice-client-win-x64 8.10-6.el8_6.1, spice-client-win-x86 8.10-6.el8_6.1 Red Hat Enterprise Linux AppStream E4S (v.8.6) spice-client-win 8.10-6.el8_6.1, spice-client-win-x64 8.10-6.el8_6.1, spice-client-win-x86 8.10-6.el8_6.1
    fixed: vendor fix RHSA-2026:0905
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) spice-client-win 8.10-6.el8_8.1, spice-client-win-x64 8.10-6.el8_8.1, spice-client-win-x86 8.10-6.el8_8.1
    fixed: vendor fix RHSA-2026:0867
show 19 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) libsoup 2.72.0-8.el9_0.8
    fixed: vendor fix RHSA-2026:0906
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) libsoup 2.72.0-8.el9_2.8
    fixed: vendor fix RHSA-2026:0868
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libsoup3 3.6.5-3.el10_0.11
    fixed: vendor fix RHSA-2026:0836
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) libsoup 2.72.0-8.el9_4.8
    fixed: vendor fix RHSA-2026:0908
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) libsoup 2.72.0-10.el9_6.5
    fixed: vendor fix RHSA-2026:0907
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) spice-client-win 8.10-6.el8_4.1, spice-client-win-x64 8.10-6.el8_4.1, spice-client-win-x86 8.10-6.el8_4.1
    fixed: vendor fix RHSA-2026:0909
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) spice-client-win 8.10-6.el8_6.1, spice-client-win-x64 8.10-6.el8_6.1, spice-client-win-x86 8.10-6.el8_6.1
    fixed: vendor fix RHSA-2026:0905
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) spice-client-win 8.10-6.el8_8.1, spice-client-win-x64 8.10-6.el8_8.1, spice-client-win-x86 8.10-6.el8_8.1
    fixed: vendor fix RHSA-2026:0867
  • Red Hat Enterprise Linux BaseOS (v. 8) libsoup 2.62.3-11.el8_10
    fixed: vendor fix RHSA-2026:0421
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) libsoup 2.62.3-1.el8_2.7
    fixed: vendor fix RHSA-2026:0911
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) libsoup 2.62.3-2.el8_4.7
    fixed: vendor fix RHSA-2026:0909
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) libsoup 2.62.3-2.el8_6.7 Red Hat Enterprise Linux BaseOS E4S (v.8.6) libsoup 2.62.3-2.el8_6.7
    fixed: vendor fix RHSA-2026:0905
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) libsoup 2.62.3-3.el8_8.7
    fixed: vendor fix RHSA-2026:0867
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) libsoup 2.62.3-2.el8_4.7
    fixed: vendor fix RHSA-2026:0909
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) libsoup 2.62.3-2.el8_6.7
    fixed: vendor fix RHSA-2026:0905
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) libsoup 2.62.3-3.el8_8.7
    fixed: vendor fix RHSA-2026:0867
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libsoup3-doc 3.6.5-3.el10_1.8
    fixed: vendor fix RHSA-2026:0423
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libsoup3-doc 3.6.5-3.el10_0.11
    fixed: vendor fix RHSA-2026:0836
  • Red Hat Enterprise Linux Server (v. 7 ELS) libsoup 2.62.2-10.el7_9
    fixed: vendor fix RHSA-2026:0925

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.