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CVE Record

CVE-2025-11021: Libsoup: out-of-bounds read in cookie date handling of libsoup http library

A flaw was found in the cookie date handling logic of the libsoup HTTP library, widely used by GNOME and other applications for web communication. When processing cookies with specially crafted expiration dates, the library may perform an out-of-bounds memory read. This flaw could result in unintended disclosure of memory contents, potentially exposing sensitive information from the process using libsoup.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2025-11021 is an out-of-bounds read in libsoup cookie expiration-date parsing. A malicious or compromised web endpoint could trigger memory disclosure from an application using libsoup to process cookies. The known impact is confidentiality only; the provided sources do not show code execution, data modification, or service outage.

Executive priority

Treat this as a high-priority patching item for Red Hat fleets because it can expose process memory without authentication or user interaction. It is not currently supported as an emergency exploitation response by the provided sources, but confidentiality impact warrants timely remediation.

Technical view

libsoup and libsoup3 can read past intended memory bounds while handling specially crafted cookie expiration dates. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, score 7.5. Red Hat lists multiple RHEL 7 ELS, 8, 9, and 10 package streams as affected.

Likely exposure

Exposure is most likely on Red Hat systems running affected libsoup or libsoup3 packages, especially applications that make HTTP requests and accept cookies from remote services. Non-Red Hat exposure is plausible because libsoup is used beyond RHEL, but the provided affected list only substantiates Red Hat package streams.

Exploitation context

The bundle does not cite active exploitation, and KEV is false. The issue is remotely reachable in theory because cookie data can arrive over network HTTP interactions, but the sources do not provide exploit maturity, proof-of-concept status, or attacker prevalence.

Researcher notes

Focus validation on package provenance, linked applications, and cookie-handling exposure. The provided evidence supports out-of-bounds read and memory disclosure risk, not integrity or availability impact. Red Hat marks RHEL 6 status unknown, so do not infer exposure or fixes without vendor confirmation.

Mitigation direction

  • Apply the relevant Red Hat security advisory updates for affected RHEL streams.
  • Inventory systems for installed libsoup and libsoup3 packages.
  • Prioritize internet-facing or high-trust applications that process external HTTP cookies.
  • Check upstream GNOME/libsoup and OS vendor guidance for non-Red Hat platforms.
  • Restart affected applications after library updates where required by vendor guidance.

Validation and detection

  • Confirm installed libsoup or libsoup3 package versions against the affected Red Hat list.
  • Verify applicable RHSA updates are installed on each affected RHEL stream.
  • Identify applications dynamically linked to libsoup that process untrusted HTTP responses.
  • Review vulnerability scanner findings for CVE-2025-11021 and reconcile false positives manually.
  • Document unsupported or unknown-status platforms, including RHEL 6, for risk acceptance or upgrade planning.
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-125: 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-2025-11021 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
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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
17Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6redhat

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2025-11021Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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_0.7affected
Red HatRed Hat Enterprise Linux 10libsoup3, 0:3.6.5-3.el10_1.6affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportlibsoup, 0:2.62.2-9.el7_9affected
Red HatRed Hat Enterprise Linux 8libsoup, 0:2.62.3-10.el8_10affected
Red HatRed Hat Enterprise Linux 8libsoup, 0:2.62.3-10.el8_10affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportlibsoup, 0:2.62.3-1.el8_2.6affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportlibsoup, 0:2.62.3-2.el8_4.6affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onlibsoup, 0:2.62.3-2.el8_4.6affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportlibsoup, 0:2.62.3-2.el8_6.6affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Servicelibsoup, 0:2.62.3-2.el8_6.6affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionslibsoup, 0:2.62.3-2.el8_6.6affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionslibsoup, 0:2.62.3-3.el8_8.6affected
Red HatRed Hat Enterprise Linux 9libsoup, 0:2.72.0-10.el9_6.3affected
Red HatRed Hat Enterprise Linux 9libsoup, 0:2.72.0-12.el9_7.1affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionslibsoup, 0:2.72.0-8.el9_0.6affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionslibsoup, 0:2.72.0-8.el9_2.6affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportlibsoup, 0:2.72.0-8.el9_4.6affected
Red HatRed Hat Enterprise Linux 6libsoupunknown
Weakness

CWE details

CWE-125

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

CWE-125 · source CWE mapping

Out-of-bounds Read

Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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