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CVE Record

CVE-2025-46421: Libsoup: information disclosure may leads libsoup client sends authorization header to a different host when being redirected by a server

A flaw was found in libsoup. When libsoup clients encounter an HTTP redirect, they mistakenly send the HTTP Authorization header to the new host that the redirection points to. This allows the new host to impersonate the user to the original host that issued the redirect.

MediumCVSS 6.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Libsoup can carry an Authorization header across a redirect to a different host. That destination could receive a user credential or token and reuse it against the original service. Exploitation requires an authenticated request, a cross-host redirect, and user interaction, but successful abuse could expose data or enable actions as the user.

Executive priority

Prioritize remediation for internet-facing or sensitive applications that combine affected libsoup versions, authentication headers, and redirect handling. Treat this as a scheduled high-value security update rather than an emergency response unless internal evidence shows credential exposure. Investigate promptly if authenticated traffic has followed redirects to unfamiliar hosts.

Technical view

CVE-2025-46421 is cross-host credential disclosure during HTTP redirect handling. Its CVSS 3.1 score is 6.8: network-accessible, high complexity, no privileges required, and user interaction required. Confidentiality and integrity impacts are high; availability is unaffected. The bundle confirms affected libsoup or libsoup3 packages across listed RHEL 8, 9, and 10 releases.

Likely exposure

Exposure is highest where applications use affected libsoup packages for authenticated HTTP requests and follow redirects to different hosts. The bundle identifies specific RHEL 8, 9, and 10 package builds as affected. RHEL 6 and 7 status is unknown, and the bundle does not establish the complete affected range for other distributions or upstream versions.

Exploitation context

The source bundle reports no CISA KEV listing and provides no evidence of active exploitation or a public exploit. Abuse depends on an authenticated request encountering a cross-host redirect whose destination can capture the forwarded Authorization header. The CVSS assessment reflects the resulting high attack complexity and required user interaction.

Researcher notes

The issue is categorized as CWE-497 and affects redirect-boundary handling rather than initial authentication. Validation should focus on whether host changes remove Authorization before the redirected request. The source bundle does not define a complete upstream affected-version range, establish RHEL 6 or 7 status, or document exploitation in the wild.

Mitigation direction

  • Identify applications and services using libsoup or libsoup3 for authenticated HTTP traffic.
  • Apply vendor-approved package updates identified by the applicable Red Hat advisory.
  • Consult upstream or distribution guidance for platforms not covered by the listed Red Hat advisories.
  • Where feasible, suppress Authorization headers whenever a redirect changes the destination host.
  • Temporarily restrict untrusted cross-host redirects in affected applications until vendor remediation is applied.

Validation and detection

  • Inventory installed libsoup and libsoup3 package versions across relevant systems and application images.
  • Compare discovered Red Hat package builds with the affected versions and applicable errata.
  • In a controlled test, verify Authorization headers are absent after redirects to a different host.
  • Review authenticated HTTP flows for cross-host redirects and unexpected redirect destinations.
  • Confirm updated systems use vendor-approved packages and repeat the controlled redirect test.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-497: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2025-46421 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
1ADP providers
14Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.8CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N1.65.2redhat

Vulnerability scoring details

Base CVSS 3.1 score

6.8Medium
CVSS 3.1 vector shape for CVE-2025-46421Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineredhat

    Made public.

  2. Source timelineredhat

    Reported to Red Hat.

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Unknown vendorlibsouplibsoup, 0unaffected
Red HatRed Hat Enterprise Linux 10libsoup3, 0:3.6.5-3.el10_0affected
Red HatRed Hat Enterprise Linux 8libsoup, 0:2.62.3-8.el8_10affected
Red HatRed Hat Enterprise Linux 8libsoup, 0:2.62.3-8.el8_10affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportlibsoup, 0:2.62.3-1.el8_2.4affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportlibsoup, 0:2.62.3-2.el8_4.4affected
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update Servicelibsoup, 0:2.62.3-2.el8_4.4affected
Red HatRed Hat Enterprise Linux 8.4 Update Services for SAP Solutionslibsoup, 0:2.62.3-2.el8_4.4affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportlibsoup, 0:2.62.3-2.el8_6.4affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Servicelibsoup, 0:2.62.3-2.el8_6.4affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionslibsoup, 0:2.62.3-2.el8_6.4affected
Red HatRed Hat Enterprise Linux 8.8 Extended Update Supportlibsoup, 0:2.62.3-3.el8_8.4affected
Red HatRed Hat Enterprise Linux 9libsoup, 0:2.72.0-10.el9_6.1affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionslibsoup, 0:2.72.0-8.el9_0.4affected
Red HatRed Hat Enterprise Linux 9.2 Extended Update Supportlibsoup, 0:2.72.0-8.el9_2.4affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportlibsoup, 0:2.72.0-8.el9_4.4affected
Red HatRed Hat Enterprise Linux 6libsoupunknown
Red HatRed Hat Enterprise Linux 7libsoupunknown
Weakness

CWE details

CWE-497

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-497 · source CWE mapping

Exposure of Sensitive System Information to an Unauthorized Control Sphere

Exposure of Sensitive System Information to an Unauthorized Control Sphere represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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