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NVD / CVE Program· CNA redhat

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

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.63% (FIRST EPSS); higher than 51% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: azl3 libsoup 3.4.4-9 on Azure Linux 3.0 3.4.4-10; cbl2 libsoup 3.0.4-10 on CBL Mariner 2.0 3.0.4-10; cbl2 libsoup 3.0.4-9 on CBL Mariner 2.0 3.0.4-10.

Low priority for now. Upgrade to azl3 libsoup 3.4.4-9 on Azure Linux 3.0 3.4.4-10; cbl2 libsoup 3.0.4-10 on CBL Mariner 2.0 3.0.4-10; cbl2 libsoup 3.0.4-9 on CBL Mariner 2.0 3.0.4-10 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

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.

Published
Sep 26, 2025
Updated
Nov 4, 2026
EPSS
0.6% · 51th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
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.

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  • 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.

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  • 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.

  • gitlab.gnome.org/GNOME/libsoup/ libsoup

    • up to and including 3.6.5affected · semver

  • Red Hat Red Hat Enterprise Linux 10

    • 0:3.6.5-3.el10_0.7 and laternot affected · rpm
    • 0:3.6.5-3.el10_1.6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

    • 0:2.62.2-9.el7_9 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8

    • 0:2.62.3-10.el8_10 and laternot affected · rpm
    • 0:2.62.3-10.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support

    • 0:2.62.3-1.el8_2.6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 0:2.62.3-2.el8_4.6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

    • 0:2.62.3-2.el8_4.6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

    • 0:2.62.3-2.el8_6.6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service

    • 0:2.62.3-2.el8_6.6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions

    • 0:2.62.3-2.el8_6.6 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

    • 0:2.62.3-3.el8_8.6 and laternot affected · rpm

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10libsoup3before 3.6.5-3.el10_1.63.6.5-3.el10_1.6
AlmaLinux:10libsoup3-develbefore 3.6.5-3.el10_1.63.6.5-3.el10_1.6
AlmaLinux:10libsoup3-docbefore 3.6.5-3.el10_1.63.6.5-3.el10_1.6
AlmaLinux:10libsoup3-docbefore 3.6.5-3.el10_0.73.6.5-3.el10_0.7
AlmaLinux:8libsoupbefore 2.62.3-10.el8_102.62.3-10.el8_10
AlmaLinux:8libsoup-develbefore 2.62.3-10.el8_102.62.3-10.el8_10
AlmaLinux:9libsoupbefore 2.72.0-12.el9_7.12.72.0-12.el9_7.1
AlmaLinux:9libsoup-develbefore 2.72.0-12.el9_7.12.72.0-12.el9_7.1
Debian:12libsoup3from 0—
openSUSE:Leap 15.6libsoupbefore 3.4.4-150600.3.18.13.4.4-150600.3.18.1
openSUSE:Leap 16.0libsoupbefore 3.6.5-160000.3.13.6.5-160000.3.1
openSUSE:Tumbleweedlibsoupbefore 3.6.5-7.13.6.5-7.1
Red Hat:enterprise_linux:10.0libsoup3before 0:3.6.5-3.el10_0.70:3.6.5-3.el10_0.7
Red Hat:enterprise_linux:10.0libsoup3-debuginfobefore 0:3.6.5-3.el10_0.70:3.6.5-3.el10_0.7
Red Hat:enterprise_linux:10.0libsoup3-debugsourcebefore 0:3.6.5-3.el10_0.70:3.6.5-3.el10_0.7
Red Hat:enterprise_linux:10.0libsoup3-develbefore 0:3.6.5-3.el10_0.70:3.6.5-3.el10_0.7
Red Hat:enterprise_linux:10.0libsoup3-docbefore 0:3.6.5-3.el10_0.70:3.6.5-3.el10_0.7
Red Hat:enterprise_linux:10.1libsoup3before 0:3.6.5-3.el10_1.60:3.6.5-3.el10_1.6
Red Hat:enterprise_linux:10.1libsoup3-debuginfobefore 0:3.6.5-3.el10_1.60:3.6.5-3.el10_1.6
Red Hat:enterprise_linux:10.1libsoup3-debugsourcebefore 0:3.6.5-3.el10_1.60:3.6.5-3.el10_1.6
Red Hat:enterprise_linux:10.1libsoup3-develbefore 0:3.6.5-3.el10_1.60:3.6.5-3.el10_1.6
Red Hat:enterprise_linux:10.1libsoup3-docbefore 0:3.6.5-3.el10_1.60:3.6.5-3.el10_1.6
Red Hat:enterprise_linux:8::appstreamlibsoup-debuginfobefore 0:2.62.3-10.el8_100:2.62.3-10.el8_10
Red Hat:enterprise_linux:8::appstreamlibsoup-debugsourcebefore 0:2.62.3-10.el8_100:2.62.3-10.el8_10

+51

Same product

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Published before and after this one in the same product

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    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
azl3 libsoup 3.4.4-9 on Azure Linux 3.03.4.4-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libsoup 3.0.4-10 on CBL Mariner 2.03.0.4-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libsoup 3.0.4-9 on CBL Mariner 2.03.0.4-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:libsoup2.62.3-10.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:libsoup-devel2.62.3-10.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:libsoup33.6.5-3.el10_1.6 · AlmaLinux:10Package registry (OSV)
almalinux:libsoup3-devel3.6.5-3.el10_1.6 · AlmaLinux:10Package registry (OSV)
almalinux:libsoup3-doc3.6.5-3.el10_0.7 · AlmaLinux:10Package registry (OSV)
debian:libsoup33.6.5-5 · Debian:14Package registry (OSV)
opensuse:libsoup3.4.4-150600.3.18.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:libsoup0:2.72.0-10.el9_6.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libsoup-debuginfo0:2.72.0-10.el9_6.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libsoup-debugsource0:2.72.0-10.el9_6.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libsoup-devel0:2.72.0-10.el9_6.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libsoup30:3.6.5-3.el10_0.7 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:libsoup3-debuginfo0:3.6.5-3.el10_0.7 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:libsoup3-debugsource0:3.6.5-3.el10_0.7 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:libsoup3-devel0:3.6.5-3.el10_0.7 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:libsoup3-doc0:3.6.5-3.el10_0.7 · Red Hat:enterprise_linux:10.0Package registry (OSV)
rocky linux:libsoup0:2.72.0-10.el9_6.3 · Rocky Linux:9Package registry (OSV)
rocky linux:libsoup30:3.6.5-3.el10_0.7 · Rocky Linux:10Package registry (OSV)
suse:libsoup3.4.2-9.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:libsoup3.4.4-150600.3.18.1 · 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.

Variant candidates

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

  • CVE-2025-49796102 days apartLibxml: type confusion leads to denial of service (dos)
    36Monitor
  • CVE-2026-119610409 days apartGstreamer1-plugins-good: gstreamer1-plugins-good: out-of-bounds heap read in mtap16/mtap24 h.264 rtp depayloader via signed/unsigned underflow
    32Monitor
  • CVE-2026-34003209 days apartXorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access
    31Monitor
  • CVE-2025-32906165 days apartLibsoup: out of bounds reads in soup_headers_parse_request()
    30Monitor
  • CVE-2026-85234354 days apartTftp: tftp-hpa: denial of service due to out-of-bounds read/write in remap engine
    30Monitor
  • CVE-2026-115484392 days apartOpen-iscsi: open-iscsi: dhcpv4 option parser heap out-of-bounds read in iscsiuio parse_msg
    30Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

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
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

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:H/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 (15 more)

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

All records