VDB-343728 · CVE-2026-1757 · EUVD-2026-5101

libxml2 xmllint memory leak

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5.2	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in libxml2. Affected by this vulnerability is an unknown functionality of the component xmllint. The manipulation results in memory leak. This vulnerability was named CVE-2026-1757. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in libxml2 (version unknown). Affected is an unknown function of the component xmllint. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. CVE summarizes:

A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where memory allocated for user input is not properly released under certain conditions. When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system.

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-1757 since 02/02/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 297549 (Linux Distros Unpatched Vulnerability : CVE-2026-1757), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (297549), EUVD (EUVD-2026-5101) and CERT Bund (WID-SEC-2026-0284). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

Open Source libxml2

Productinfo

Type

Document Processing Software

Name

libxml2

License

open-source

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.2
CNA Vector (redhat): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
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Nessus ID: 297549
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-1757

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/02/2026 Advisory disclosed
02/02/2026 +0 days CVE reserved
02/02/2026 +0 days VulDB entry created
03/12/2026 +38 days VulDB entry last update

Sourcesinfo

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2026-1757 (🔒)
GCVE (CVE): GCVE-0-2026-1757
GCVE (VulDB): GCVE-100-343728
EUVD: 🔒
CERT Bund: WID-SEC-2026-0284 - libxml2 (xmllint): Schwachstelle ermöglicht Denial of Service

Entryinfo

Created: 02/02/2026 13:57
Updated: 03/12/2026 14:39
Changes: 02/02/2026 13:57 (61), 02/03/2026 01:11 (2), 02/03/2026 08:26 (1), 02/03/2026 11:47 (7), 03/12/2026 14:39 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.