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NVD / CVE Program· CNA redhat

CVE-2026-2443: Libsoup: out-of-bounds read in libsoup handle_partial_get() leading to heap information disclosure

Noroxi assessment

Priority: Monitor (action score 21/100)

  • 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: 0.48% (FIRST EPSS).
  • 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 3.4.4-12 on Azure Linux 3.0 3.4.4-13; azl3 libsoup 3.4.4-14 on Azure Linux 3.0 3.4.4-14; cbl2 libsoup 3.0.4-13 on CBL Mariner 2.0 3.0.4-14.

Low priority for now. Upgrade to azl3 libsoup 3.4.4-12 on Azure Linux 3.0 3.4.4-13; azl3 libsoup 3.4.4-14 on Azure Linux 3.0 3.4.4-14; cbl2 libsoup 3.0.4-13 on CBL Mariner 2.0 3.0.4-14 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 identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In certain build configurations, this could allow a remote attacker to access portions of server memory beyond the intended response. Exploitation requires a vulnerable configuration and access to a server using the embedded SoupServer component.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Feb 13, 2026
Updated
Jun 17, 2026
EPSS
0.4% · 42th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.3
CNA · redhat
5.3
agree

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.

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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.

VendorProduct
gnomelibsoup
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • gnome libsoupall versions
  • redhat enterprise linux10.0
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0

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

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • 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:12libsoup2.4from 0—
Debian:12libsoup3from 0—
openSUSE:Leap 15.6libsoupbefore 3.4.4-150600.3.34.13.4.4-150600.3.34.1
openSUSE:Leap 15.6libsoup2before 2.74.3-150600.4.27.12.74.3-150600.4.27.1
openSUSE:Leap 16.0libsoupbefore 3.6.6-160000.1.13.6.6-160000.1.1
openSUSE:Leap 16.0libsoup2before 2.74.3-160000.4.12.74.3-160000.4.1
openSUSE:Tumbleweedlibsoupbefore 3.6.5-13.13.6.5-13.1
openSUSE:Tumbleweedlibsoup2before 2.74.3-16.12.74.3-16.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSlibsoupbefore 3.0.4-150400.3.34.13.0.4-150400.3.34.1
SUSE:Linux Enterprise Micro 5.2libsoupbefore 2.68.4-150200.4.30.12.68.4-150200.4.30.1
SUSE:Linux Enterprise Micro 5.3libsoup2before 2.74.2-150400.3.31.12.74.2-150400.3.31.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libsoupbefore 3.4.4-150600.3.34.13.4.4-150600.3.34.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libsoup2before 2.74.3-150600.4.27.12.74.3-150600.4.27.1
SUSE:Linux Enterprise Server 12 SP5-LTSSlibsoupbefore 2.62.2-5.34.12.62.2-5.34.1
SUSE:Linux Micro 6.0libsoupbefore 3.4.2-13.13.4.2-13.1
SUSE:Linux Micro 6.1libsoupbefore 3.4.4-slfo.1.1_7.13.4.4-slfo.1.1_7.1
SUSE:Linux Micro 6.2libsoupbefore 3.6.6-160000.1.13.6.6-160000.1.1

Same product

gnome: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-2885An exploitable stack based buffer overflow vulnerability exists in the GNOME libsoup 2.58.
    46Plan
  • CVE-2019-17266libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does no
    40Plan
  • CVE-2018-12910The get_cookies function in soup-cookie-jar.c in libsoup 2.63.2 allows attackers to have unspecified impact via an empty hostname.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-1539Jan 28, 2026 · Libsoup: libsoup: credential leakage via http redirects
    23Monitor
  • ← EarlierCVE-2026-1801Feb 3, 2026 · Libsoup: libsoup: http request smuggling via malformed chunk headers
    26Monitor
  • Later →CVE-2026-3099Mar 12, 2026 · Libsoup: libsoup: authentication bypass via digest authentication replay attack
    29Monitor

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 3.4.4-12 on Azure Linux 3.03.4.4-13 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 libsoup 3.4.4-14 on Azure Linux 3.03.4.4-14 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libsoup 3.0.4-13 on CBL Mariner 2.03.0.4-14 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libsoup 3.0.4-13 on CBL-Mariner 2.03.0.4-14 · Release NotesMicrosoft (MSRC)
debian:libsoup33.6.6-1 · Debian:14Package registry (OSV)
opensuse:libsoup3.4.4-150600.3.34.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:libsoup22.74.3-150600.4.27.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:libsoup2.68.4-150200.4.30.1 · SUSE:Linux Enterprise Micro 5.2Package registry (OSV)
suse:libsoup3.4.4-150600.3.34.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:libsoup22.74.3-150600.4.27.1 · 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.

No history yet (it accumulates with the daily EPSS job).

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.

Variant candidates

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

  • CVE-2026-102560228 days apartLibsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth
    39Monitor
  • CVE-2026-102557228 days apartLibsoup: libsoup: heap buffer overflow during websocket message reassembly
    34Monitor
  • CVE-2026-102558228 days apartLibsoup: libsoup: heap buffer overflow during websocket receive-buffer growth
    34Monitor
  • CVE-2026-102559228 days apartLibsoup: libsoup: heap buffer overflow during websocket client-frame masking
    34Monitor
  • CVE-2026-102555228 days apartLibsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding
    32Monitor
  • CVE-2026-66337161 days apartLibsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_read_until()
    26Monitor

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
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
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:L/I:N/A:N

nvd-primary

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

Show all references (2 more)

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

All records