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NVD / CVE Program· CNA redhat

CVE-2026-12547: Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch

LowCVSS 3.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 13/100)

  • 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: 0.22% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: azl3 libsoup 3.4.4-16 on Azure Linux 3.0 Release Notes; azl3 libsoup 3.4.4-17 on Azure Linux 3.0 Release Notes; azl3 libsoup 3.4.4-18 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to azl3 libsoup 3.4.4-16 on Azure Linux 3.0 Release Notes; azl3 libsoup 3.4.4-17 on Azure Linux 3.0 Release Notes; azl3 libsoup 3.4.4-18 on Azure Linux 3.0 Release Notes 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

SoupAuthManager caches proxy authentication credentials without scoping them to the proxy authority (host:port). When the proxy configuration changes (e.g., via system settings or WPAD), cached Proxy-Authorization headers from the previous proxy are sent to the new proxy, leaking credentials.

Published
Jul 21, 2026
Updated
Nov 6, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

13

Monitor

Low priority for now.

CVSS
13 / 40 · 3.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
3.4
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.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-12547

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

    • all versionsaffected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12libsoup2.4from 0—
Debian:12libsoup3from 0—
openSUSE:Leap 16.0libsoupbefore 3.6.6-160000.5.13.6.6-160000.5.1
openSUSE:Tumbleweedlibsoupbefore 3.8.1-1.13.8.1-1.1
openSUSE:Tumbleweedlibsoup2before 2.74.3-24.12.74.3-24.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSlibsoupbefore 3.0.4-150400.3.52.13.0.4-150400.3.52.1
SUSE:Linux Enterprise Micro 5.3libsoup2before 2.74.3-150400.3.43.12.74.3-150400.3.43.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libsoupbefore 3.4.4-150600.3.56.13.4.4-150600.3.56.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libsoup2before 2.74.3-150600.4.42.12.74.3-150600.4.42.1
SUSE:Linux Enterprise Server 12 SP5-LTSSlibsoupbefore 2.62.2-5.49.12.62.2-5.49.1
SUSE:Linux Enterprise Server 16.0libsoupbefore 3.6.6-160000.5.13.6.6-160000.5.1
SUSE:Linux Micro 6.0libsoupbefore 3.4.2-159998.1.13.4.2-159998.1.1

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-2026-15812Jul 21, 2026 · Kronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynamic links
    19Monitor
  • ← EarlierCVE-2026-16461Jul 21, 2026 · Rpcbind: rpcbind: stack buffer overflow in rpcinfo rpcbdump() short-mode version-list formatting
    26Monitor
  • Later →CVE-2026-16517Jul 21, 2026 · Libarchive: libarchive: signed integer overflow in archive_write_zip_header
    11Monitor

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
azl3 libsoup 3.4.4-16 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 libsoup 3.4.4-17 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 libsoup 3.4.4-18 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:libsoup33.8.0-1 · Debian:14Package registry (OSV)
opensuse:libsoup3.8.1-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:libsoup22.74.3-24.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:libsoup3.0.4-150400.3.52.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:libsoup3.4.2-159998.1.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:libsoup22.74.3-150600.4.42.1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Credits

All researchers

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

Not on record for this CVE: patch commit or PR link · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-201 · Insertion of Sensitive Information Into Sent Data

CVSS vector

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

—

References

Show all references (2 more)

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

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