8.2

CVE-2025-14523: libsoup3 HTTP Request/Response Smuggling

CVSS: 8.2v3.1HighDeferred
AliasesSUSE-SU-2026:0123-1SUSE-SU-2026:20053-1RHSA-2026:0421
Published 11-12-2025Last modified 29-06-2026
Open JSON

Vulnerability summary

CVE-2025-14523 is a high (CVSS 8.2) HTTP Request/Response Smuggling vulnerability in libsoup3. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.5% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.54%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 11
OPENSUSE-SU-2026:20354-1OPENSUSE-SU-2026:20384-1SUSE-SU-2026:0151-1SUSE-SU-2026:0211-1SUSE-SU-2026:0253-1SUSE-SU-2026:0257-1

Timeline

  1. 11-12-2025
    PublishedVulnerability first disclosed.
  2. 29-06-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

0.00 pp

From 0.54% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.54%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat12 products
  • libsoup< 0:2.62.3-3.el8_8.7 | < 0:2.72.0-8.el9_2.8 | < 0:2.62.3-2.el8_6.7 | < 0:2.72.0-8.el9_0.8 | < 0:2.72.0-10.el9_6.5 | < 0:2.72.0-8.el9_4.8 | < 0:2.62.3-2.el8_4.7 | < 0:2.62.3-1.el8_2.7 | < 0:2.62.2-10.el7_9 | < 0:2.62.3-11.el8_10 | < 0:2.72.0-12.el9_7.3
  • libsoup-debuginfo< 0:2.62.3-3.el8_8.7 | < 0:2.72.0-8.el9_2.8 | < 0:2.62.3-2.el8_6.7 | < 0:2.72.0-8.el9_0.8 | < 0:2.72.0-10.el9_6.5 | < 0:2.72.0-8.el9_4.8 | < 0:2.62.3-2.el8_4.7 | < 0:2.62.3-1.el8_2.7 | < 0:2.62.2-10.el7_9 | < 0:2.62.3-11.el8_10 | < 0:2.72.0-12.el9_7.3
  • libsoup-debugsource< 0:2.62.3-3.el8_8.7 | < 0:2.72.0-8.el9_2.8 | < 0:2.62.3-2.el8_6.7 | < 0:2.72.0-8.el9_0.8 | < 0:2.72.0-10.el9_6.5 | < 0:2.72.0-8.el9_4.8 | < 0:2.62.3-2.el8_4.7 | < 0:2.62.3-1.el8_2.7 | < 0:2.62.3-11.el8_10 | < 0:2.72.0-12.el9_7.3
  • libsoup-devel< 0:2.62.3-3.el8_8.7 | < 0:2.72.0-8.el9_2.8 | < 0:2.62.3-2.el8_6.7 | < 0:2.72.0-8.el9_0.8 | < 0:2.72.0-10.el9_6.5 | < 0:2.72.0-8.el9_4.8 | < 0:2.62.3-2.el8_4.7 | < 0:2.62.3-1.el8_2.7 | < 0:2.62.2-10.el7_9 | < 0:2.62.3-11.el8_10 | < 0:2.72.0-12.el9_7.3
  • libsoup3< 0:3.6.5-3.el10_0.11 | < 0:3.6.5-3.el10_1.8
Suse3 products
  • libsoup&distro=SUSE Linux Enterprise Server 12 SP5-LTSS< 2.62.2-5.23.1
  • libsoup&distro=SUSE Linux Enterprise Server LTSS Extended Security 12 SP5< 2.62.2-5.23.1
  • libsoup&distro=SUSE Linux Micro 6.0< 3.4.2-10.1
Debian2 products
  • libsoup2.4All versions (No fix recorded)
  • libsoup3All versions (No fix recorded) | < 3.6.5-7
Opensuse2 products
  • libsoup2&distro=openSUSE Tumbleweed< 2.74.3-13.1
  • libsoup&distro=openSUSE Tumbleweed< 3.6.5-10.1
Ubuntu2 products
  • libsoup2.4All versions (No fix recorded)
  • libsoup3All versions (No fix recorded)

5 vendors · 21 products

References

49 links
Show all 49 references