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NVD / CVE Program· CNA redhat

CVE-2026-15713: Libsoup: soupcache: libsoup: http/2 frame window exhaustion remote denial of service via memory leak

Noroxi assessment

Priority: Monitor (action score 23/100)

  • 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: 0.34% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: azl3 libsoup 3.4.4-16 on Azure Linux 3.0 Release Notes; azl3 libsoup 3.4.4-17 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to azl3 libsoup 3.4.4-16 on Azure Linux 3.0 Release Notes; azl3 libsoup 3.4.4-17 on Azure Linux 3.0 Release Notes 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 vulnerability was found in libsoup's HTTP/2 protocol implementation. The library fails to correctly release memory context blocks under specific stream termination conditions, such as when an HTTP/2 connection encounters window exhaustion or explicit stream resets. A remote, unauthenticated attacker acting as a malicious network peer can trick the connection engine into allocating stream states that are subsequently leaked during cleanup. Over a sustained period, this flaw allows the remote attacker to consume the system's heap allocations incrementally, triggering a denial of service (DoS) through an ultimate Out-of-Memory (OOM) application crash.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Jul 14, 2026
Updated
Nov 6, 2026
EPSS
0.3% · 28th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
5.9
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.

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.

Follow CVE-2026-15713

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.

—

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 versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • 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 16.0libsoupbefore 3.6.6-160000.5.13.6.6-160000.5.1
openSUSE:Tumbleweedlibsoupbefore 3.8.1-1.13.8.1-1.1
openSUSE:Tumbleweedlibsoup2before 2.74.3-25.12.74.3-25.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSlibsoupbefore 3.0.4-150400.3.55.13.0.4-150400.3.55.1
SUSE:Linux Enterprise Micro 5.3libsoup2before 2.74.3-150400.3.43.12.74.3-150400.3.43.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libsoupbefore 3.4.4-150600.3.59.13.4.4-150600.3.59.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libsoup2before 2.74.3-150600.4.42.12.74.3-150600.4.42.1
SUSE:Linux Enterprise Server 12 SP5-LTSSlibsoupbefore 2.62.2-5.49.12.62.2-5.49.1
SUSE:Linux Enterprise Server 16.0libsoupbefore 3.6.6-160000.5.13.6.6-160000.5.1
SUSE:Linux Micro 6.0libsoupbefore 3.4.2-159998.1.13.4.2-159998.1.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-15709Jul 14, 2026 · Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service
    30Monitor
  • ← EarlierCVE-2026-15711Jul 14, 2026 · Libsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversized control frame protocol violation
    30Monitor
  • Later →CVE-2026-15714Jul 14, 2026 · Libsoup: soupmultipartinputstream: libsoup: out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string
    26Monitor

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 3.4.4-16 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 libsoup 3.4.4-17 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:libsoup33.8.0-1 · Debian:14Package registry (OSV)
opensuse:libsoup3.8.1-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:libsoup22.74.3-25.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:libsoup3.0.4-150400.3.55.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:libsoup3.4.2-159998.1.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:libsoup22.74.3-150600.4.42.1 · 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.

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.

Variant candidates

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

  • CVE-2026-8909694 days apartNfs-utils: nfs-utils: denial of service via memory leak in rpc.statd
    23Monitor
  • CVE-2026-10403584 days apartSssd: sssd: denial of service via memory exhaustion in kcm responder
    22Monitor
  • CVE-2023-32255346 days apartKernel: memory leak via ksmbd session setup request with unknown ntlmssp message type
    21Monitor

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.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-772 · Missing Release of Resource after Effective Lifetime

CVSS vector

CVSS:3.1/AV:N/AC:H/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.

Attack patterns (CAPEC)

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