What is the CVSS score of CVE-2026-2369?

CVE-2026-2369 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-2369?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Libsoup CVE-2026-2369

MEDIUM

Integer Underflow (CWE-191)

2026-03-19 secalert@redhat.com

Denial Of Service Integer Overflow Libsoup Gnome

6.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-191 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Integer underflow checks
Impact	Risk signals present a mixed picture. The CVSS v3.1 score of 6.5 (AV:N/AC:L/PR:N/UI:N) reflects a remotely exploitable flaw with low complexity and no user interaction, yielding moderate severity. However, the EPSS score of 0.04% (percentile 11) substantially downgrades real-world exploitation probability-this gap between CVSS and EPSS suggests the vulnerability requires precise triggering conditions (e.g., specific zero-length resource sequences) that are uncommon in typical network traffic. No CISA KEV confirmation or public proof-of-concept is available, further supporting low active exploitation risk. The technical impact is limited to confidentiality (information disclosure of adjacent memory) and availability (denial of service via application crash), not integrity or remote code execution. For most environments, this is a low-priority remediation item unless libsoup processes untrusted HTTP content from adversarial sources; however, organizations managing embedded libsoup deployments or network-facing HTTP services should prioritize patching due to the low attack complexity.
Exploit ScenarioDerived	An attacker crafts a malicious HTTP response containing a zero-length resource (Content-Length: 0 or chunked transfer encoding with zero-sized chunk) combined with additional HTTP headers or metadata that triggers the integer underflow in libsoup's buffer size calculation. A vulnerable libsoup client processes this response and attempts to read from a massively oversized buffer due to the underflow, leaking sensitive data from the process heap or application memory. Alternatively, the read operation fails due to an access violation, crashing the application and causing denial of service. No public proof-of-concept has been published, but the low attack complexity (AC:L) means reproducing the condition requires only crafting a specific HTTP response, well within an attacker's capability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 20, 2026

libsoup versions prior to the patched release contain an integer underflow vulnerability in zero-length resource processing that enables unauthenticated remote attackers to read adjacent memory or trigger denial of service. The vulnerability stems from improper bounds checking during content handling, affecting any application using the vulnerable libsoup library for HTTP operations. No public exploit code has been identified, and the low EPSS score (0.04%, percentile 11%) indicates exploitation is unlikely in practice despite the moderate CVSS score of 6.5.

RemediationAI

Update libsoup to the patched version released by the GNOME project and distributed through your operating system's package manager. For Red Hat distributions, apply the security advisory available at https://access.redhat.com/security/cve/CVE-2026-2369. For Debian/Ubuntu systems, check the security advisories from your distribution vendor. Verify the exact patched version by consulting the vendor advisory; apply the update to all systems running libsoup-dependent applications (GNOME components, Evolution, and related tools). Until patching is possible, restrict HTTP traffic to trusted, authenticated peers where feasible, and disable HTTP client functionality in libsoup-based applications if not required for normal operation. Monitor for unexplained crashes or memory access errors in libsoup-based services, which may indicate exploitation attempts.

Affects your stack

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Technical ContextAI · show details

libsoup is a GNOME HTTP client/server library used for HTTP protocol handling in numerous desktop and server applications. The vulnerability is rooted in CWE-191 (Integer Underflow or Wraparound), a class of arithmetic errors where integer values wrap to extremely large values when decremented below zero. When libsoup processes HTTP responses with zero-length resources, improper subtraction or size calculation causes an integer underflow, resulting in a massively inflated buffer size that permits reading beyond allocated memory boundaries. This class of vulnerability is distinct from traditional buffer overflows-the attacker does not inject data, but rather causes the application to read unintended memory regions due to incorrect arithmetic. The affected component processes HTTP entity bodies and metadata, meaning any libsoup-based HTTP client or server can be exploited remotely without authentication (PR:N per CVSS vector).

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.5 MEDIUM

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

SUSE MEDIUM

Red Hat 6.5 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Lifecycle Timeline

Patch released

Apr 09, 2026 - 20:30 nvd

Patch available

CVE Published

Mar 19, 2026 - 15:16 nvd

MEDIUM 6.5

DescriptionCVE.org

A flaw was found in libsoup. An integer underflow vulnerability occurs when processing content with a zero-length resource, leading to a buffer overread. This can allow an attacker to potentially access sensitive information or cause an application level denial of service.

Executive ViewAI

Why It Matters

Organizations using A flaw should be aware of notable risk from CVE-2026-2369 rated CVSS 6.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.0%

Top 89% exploitable

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Integer Overflow MEDIUM

Integer overflow occurs when an arithmetic operation produces a result that exceeds the maximum value a given integer type can store.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*

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Same weakness CWE-191 – Integer Underflow

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CVE-2011-0611 HIGH POC

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CVE-2014-1761 HIGH POC

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CVE-2015-5122 CRITICAL POC

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CVE-2011-0609 HIGH POC

7.8

Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.53 Container suse/sl-micro/6.0/toolbox:13.2-9.12	Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production	Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS	Fixed

References

Advisories & patches

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