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NVD / CVE Program· CNA redhat

CVE-2026-12478: Libsoup: incomplete fix for cve-2026-0716: out-of-bounds read in libsoup websocket frame processing (unmasked path)

Noroxi assessment

Priority: Monitor (action score 19/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (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: libsoup3 (Debian:14) 3.8.0-1; libsoup (openSUSE:Leap 16.0) 3.6.6-160000.3.1; libsoup (openSUSE:Tumbleweed) 3.6.6-7.1.

Low priority for now. Upgrade to libsoup3 (Debian:14) 3.8.0-1; libsoup (openSUSE:Leap 16.0) 3.6.6-160000.3.1; libsoup (openSUSE:Tumbleweed) 3.6.6-7.1 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

The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.

MediumCVSS 4.8 · v3.1—Proof of concept Fix available
Published
Jul 14, 2026
Updated
Nov 5, 2026
EPSS
0.2% · 15th percentile

Report tools

JSON

Action score

19

Monitor

Low priority for now.

CVSS
19 / 40 · 4.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
4.8
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
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-12478

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 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:14libsoup3before 3.8.0-13.8.0-1
openSUSE:Leap 16.0libsoupbefore 3.6.6-160000.3.13.6.6-160000.3.1
openSUSE:Tumbleweedlibsoupbefore 3.6.6-7.13.6.6-7.1
openSUSE:Tumbleweedlibsoup2before 2.74.3-24.12.74.3-24.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSlibsoupbefore 3.0.4-150400.3.52.13.0.4-150400.3.52.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libsoupbefore 3.4.4-150600.3.56.13.4.4-150600.3.56.1
SUSE:Linux Enterprise Server 12 SP5-LTSSlibsoupbefore 2.62.2-5.49.12.62.2-5.49.1
SUSE:Linux Micro 6.0libsoupbefore 3.4.2-17.13.4.2-17.1
SUSE:Linux Micro 6.2libsoupbefore 3.6.6-160000.3.13.6.6-160000.3.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

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  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
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Published before and after this one in the same product

  • ← EarlierCVE-2026-59692Jul 9, 2026 · Gstreamer1-plugins-bad-free: gstreamer: dtls certificate subject dn stack buffer overflow in openssl_verify_callback
    30Monitor
  • ← EarlierCVE-2026-15028Jul 10, 2026 · Libarchive: heap overflow oob read while parsing a tar archive contains a pax extended header
    15Monitor
  • Later →CVE-2026-15712Jul 14, 2026 · Soupclientmessageiohttp2: libsoup3: libsoup: http/2 goaway frame parsing heap buffer over-read via invalid nul-termination assumption
    23Monitor

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:libsoup33.8.0-1 · Debian:14Package registry (OSV)
opensuse:libsoup3.6.6-7.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:libsoup22.74.3-24.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:libsoup3.4.2-17.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-08-01

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.

  1. Published
  2. First PoC+18 d
  3. TodayNov 10, 2026+119 d
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.

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-2025-49796393 days apartLibxml: type confusion leads to denial of service (dos)
    36Monitor
  • CVE-2026-119610118 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-2026-3400382 days apartXorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access
    31Monitor
  • CVE-2026-8523463 days apartTftp: tftp-hpa: denial of service due to out-of-bounds read/write in remap engine
    30Monitor
  • CVE-2026-115484101 days apartOpen-iscsi: open-iscsi: dhcpv4 option parser heap out-of-bounds read in iscsiuio parse_msg
    30Monitor
  • CVE-2025-11021291 days apartLibsoup: out-of-bounds read in cookie date handling of libsoup http library
    30Monitor

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
low · data can be read
Integrity
none
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
High
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:H/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

Show all references (2 more)

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

All records