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CVE-2025-4969· NVD / CVE Program· CNA redhat

Libsoup: off-by-one out-of-bounds read in find_boundary() in soup-multipart.c

A vulnerability was found in the libsoup package. This flaw stems from its failure to correctly verify the termination of multipart HTTP messages. This can allow a remote attacker to send a specially crafted multipart HTTP body, causing the libsoup-consuming server to read beyond its allocated memory boundaries (out-of-bounds read).

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
May 21, 2025
Updated
Jun 30, 2026
EPSS
0.9% · 57th percentile
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Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
6.5
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.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

—

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.

  • gitlab.gnome.org/GNOME/libsoup libsoup

    • up to and including 3.6.5affected · semver

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsaffected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:11libsoup2.4before 2.72.0-2+deb11u32.72.0-2+deb11u3
Debian:12libsoup2.4all versions—
Debian:12libsoup3all versions—
Debian:13libsoup3before 3.6.5-23.6.5-2
openSUSE:Tumbleweedlibsoupbefore 3.6.5-5.13.6.5-5.1
openSUSE:Tumbleweedlibsoup2before 2.74.3-11.12.74.3-11.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSlibsoupbefore 2.68.4-150200.4.9.12.68.4-150200.4.9.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSlibsoupbefore 3.0.4-150400.3.10.13.0.4-150400.3.10.1
SUSE:Linux Enterprise Micro 5.3libsoup2before 2.74.2-150400.3.9.12.74.2-150400.3.9.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6libsoupbefore 3.4.4-150600.3.10.13.4.4-150600.3.10.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6libsoupbefore 3.4.4-150600.3.10.13.4.4-150600.3.10.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6libsoup2before 2.74.3-150600.4.9.12.74.3-150600.4.9.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6libsoup2before 2.74.3-150600.4.9.12.74.3-150600.4.9.1
SUSE:Linux Enterprise Server 12 SP5-LTSSlibsoupbefore 2.62.2-5.15.12.62.2-5.15.1
SUSE:Linux Micro 6.0libsoupbefore 3.4.2-8.13.4.2-8.1
SUSE:Linux Micro 6.1libsoupbefore 3.4.4-slfo.1.1_4.13.4.4-slfo.1.1_4.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

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    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    42Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor
  • CVE-2025-4404Freeipa: idm: privilege escalation from host to domain admin in freeipa
    37Monitor
  • CVE-2025-7493Freeipa: idm: privilege escalation from host to domain admin in freeipa
    36Monitor
  • CVE-2025-49796Libxml: type confusion leads to denial of service (dos)
    36Monitor

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
debian:libsoup2.42.72.0-2+deb11u3 · Debian:11Package registry (OSV)
debian:libsoup33.6.5-2 · Debian:13Package registry (OSV)
opensuse:libsoup3.4.4-150600.3.10.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:libsoup22.74.3-150600.4.9.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:libsoup2.62.2-5.15.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:libsoup3.4.4-150600.3.10.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:libsoup22.74.3-150600.4.9.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package 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).

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.

No credits in the CNA record.

Variant candidates

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

  • CVE-2025-4979626 days apartLibxml: type confusion leads to denial of service (dos)
    36Monitor
  • CVE-2026-102557496 days apartLibsoup: libsoup: heap buffer overflow during websocket message reassembly
    34Monitor
  • CVE-2026-102558496 days apartLibsoup: libsoup: heap buffer overflow during websocket receive-buffer growth
    34Monitor
  • CVE-2026-102559496 days apartLibsoup: libsoup: heap buffer overflow during websocket client-frame masking
    34Monitor
  • CVE-2026-102560496 days apartLibsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth
    34Monitor
  • CVE-2026-102555496 days apartLibsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding
    32Monitor

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
none
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
Low

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

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

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

All records