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NVD / CVE Program· CNA redhat

CVE-2025-14523: Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.54% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: libsoup3-doc (AlmaLinux:10) 3.6.5-3.el10_1.8; libsoup (AlmaLinux:8) 2.62.3-11.el8_10; libsoup-devel (AlmaLinux:8) 2.62.3-11.el8_10.

Low priority for now. Upgrade to libsoup3-doc (AlmaLinux:10) 3.6.5-3.el10_1.8; libsoup (AlmaLinux:8) 2.62.3-11.el8_10; libsoup-devel (AlmaLinux:8) 2.62.3-11.el8_10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.2 · v3.1—No exploit Fix available
Published
Dec 11, 2025
Updated
Oct 7, 2026
EPSS
0.5% · 45th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
8.2
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:3.6.5-3.el10_1.8 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:3.6.5-3.el10_0.11 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

    • 0:2.62.2-10.el7_9 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8

    • 0:2.62.3-11.el8_10 and laternot affected · rpm
    • 0:8.10-6.el8_10.1 and laternot affected · rpm
    • 0:2.62.3-11.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support

    • 0:2.62.3-1.el8_2.7 and laternot affected · rpm
    • 0:8.10-6.el8_2.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 0:2.62.3-2.el8_4.7 and laternot affected · rpm
    • 0:8.10-6.el8_4.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

    • 0:2.62.3-2.el8_4.7 and laternot affected · rpm
    • 0:8.10-6.el8_4.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

    • 0:2.62.3-2.el8_6.7 and laternot affected · rpm
    • 0:8.10-6.el8_6.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service

    • 0:2.62.3-2.el8_6.7 and laternot affected · rpm
    • 0:8.10-6.el8_6.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions

    • 0:2.62.3-2.el8_6.7 and laternot affected · rpm
    • 0:8.10-6.el8_6.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

    • 0:2.62.3-3.el8_8.7 and laternot affected · rpm
    • 0:8.10-6.el8_8.1 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10libsoup3-docbefore 3.6.5-3.el10_1.83.6.5-3.el10_1.8
AlmaLinux:8libsoupbefore 2.62.3-11.el8_102.62.3-11.el8_10
AlmaLinux:8libsoup-develbefore 2.62.3-11.el8_102.62.3-11.el8_10
AlmaLinux:9libsoupbefore 2.72.0-12.el9_7.32.72.0-12.el9_7.3
AlmaLinux:9libsoup-develbefore 2.72.0-12.el9_7.32.72.0-12.el9_7.3
Debian:12libsoup2.4from 0—
Debian:12libsoup3from 0—
openSUSE:Leap 15.6libsoupbefore 3.4.4-150600.3.28.13.4.4-150600.3.28.1
openSUSE:Leap 15.6libsoup2before 2.74.3-150600.4.19.12.74.3-150600.4.19.1
openSUSE:Leap 16.0libsoupbefore 3.6.6-160000.1.13.6.6-160000.1.1
openSUSE:Leap 16.0libsoup2before 2.74.3-160000.4.12.74.3-160000.4.1
openSUSE:Tumbleweedlibsoupbefore 3.6.5-10.13.6.5-10.1
openSUSE:Tumbleweedlibsoup2before 2.74.3-13.12.74.3-13.1
Red Hat:enterprise_linux_eus:10.0libsoup3before 0:3.6.5-3.el10_0.110:3.6.5-3.el10_0.11
Red Hat:enterprise_linux_eus:10.0libsoup3-debuginfobefore 0:3.6.5-3.el10_0.110:3.6.5-3.el10_0.11
Red Hat:enterprise_linux_eus:10.0libsoup3-debugsourcebefore 0:3.6.5-3.el10_0.110:3.6.5-3.el10_0.11
Red Hat:enterprise_linux_eus:10.0libsoup3-develbefore 0:3.6.5-3.el10_0.110:3.6.5-3.el10_0.11
Red Hat:enterprise_linux_eus:10.0libsoup3-docbefore 0:3.6.5-3.el10_0.110:3.6.5-3.el10_0.11
Red Hat:enterprise_linux:10.1libsoup3before 0:3.6.5-3.el10_1.80:3.6.5-3.el10_1.8
Red Hat:enterprise_linux:10.1libsoup3-debuginfobefore 0:3.6.5-3.el10_1.80:3.6.5-3.el10_1.8
Red Hat:enterprise_linux:10.1libsoup3-debugsourcebefore 0:3.6.5-3.el10_1.80:3.6.5-3.el10_1.8
Red Hat:enterprise_linux:10.1libsoup3-develbefore 0:3.6.5-3.el10_1.80:3.6.5-3.el10_1.8
Red Hat:enterprise_linux:10.1libsoup3-docbefore 0:3.6.5-3.el10_1.80:3.6.5-3.el10_1.8
Red Hat:enterprise_linux:8::appstreamlibsoup-debuginfobefore 0:2.62.3-11.el8_100:2.62.3-11.el8_10

+71

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-12748Nov 11, 2025 · Libvirt: denial of service in xml parsing
    22Monitor
  • ← EarlierCVE-2025-13193Nov 17, 2025 · Libvirt: information disclosure via world-readable vm snapshots
    22Monitor
  • Later →CVE-2026-0719Jan 8, 2026 · Libsoup: signed to unsigned conversion error leading to stack-based buffer overflow in libsoup ntlm authentication
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:libsoup2.62.3-11.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:libsoup-devel2.62.3-11.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:libsoup3-doc3.6.5-3.el10_1.8 · AlmaLinux:10Package registry (OSV)
debian:libsoup33.6.5-7 · Debian:14Package registry (OSV)
opensuse:libsoup3.4.4-150600.3.28.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:libsoup22.74.3-150600.4.19.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:libsoup0:2.62.3-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:libsoup-debuginfo0:2.62.3-11.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libsoup-debugsource0:2.62.3-11.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libsoup-devel0:2.62.3-11.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libsoup30:3.6.5-3.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:libsoup3-debuginfo0:3.6.5-3.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:libsoup3-debugsource0:3.6.5-3.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:libsoup3-devel0:3.6.5-3.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:libsoup3-doc0:3.6.5-3.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:spice-client-win0:8.10-6.el8_10.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:spice-client-win-x640:8.10-6.el8_10.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:spice-client-win-x860:8.10-6.el8_10.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:libsoup0:2.62.3-11.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:libsoup30:3.6.5-3.el10_1.8 · Rocky Linux:10Package registry (OSV)
rocky linux:spice-client-win0:8.10-6.el8_10.1 · Rocky Linux:8Package registry (OSV)
suse:libsoup2.62.2-5.23.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:libsoup3.4.4-150600.3.28.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:libsoup22.74.3-150600.4.19.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-176053 days apartLibsoup: soupserver: denial of service via http request smuggling
    21Monitor
  • CVE-2026-103399293 days apartLibsoup: soupserver: http/1 request smuggling via undrained expect: 100-continue body
    21Monitor
  • CVE-2026-6324169 days apartLibsoup: libsoup: http request smuggling via unsigned to signed conversion error
    19Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records