Vulnerability-Lookup

CVE-2026-1757 (GCVE-0-2026-1757)

Vulnerability from cvelistv5 – Published: 2026-02-02 12:38 – Updated: 2026-09-01 11:54

Title

Libxml2: memory leak leading to local denial of service in xmllint interactive shell

Summary

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.

Severity

6.2 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-02 17:35 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:7519	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-1757	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2435940	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/libxml2/-/issues/1009

Impacted products

8 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 2.15.2-0.3.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat JBoss Core Services	cpe:/a:redhat:jboss_core_services:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-02-02 00:00

Credits

Red Hat would like to thank lanbigking for reporting this issue.

Show details on NVD website

JSON

To clipboard

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              "value": "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."
            }
          ],
          "metrics": [
            {
              "other": {
                "content": {
                  "namespace": "https://access.redhat.com/security/updates/classification/",
                  "value": "Moderate"
                },
                "type": "Red Hat severity rating"
              }
            },
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 6.2,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-401",
                  "description": "Missing Release of Memory after Effective Lifetime",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-01T11:54:59.951Z",
            "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
            "shortName": "redhat"
          },
          "references": [
            {
              "name": "RHSA-2026:7519",
              "tags": [
                "vendor-advisory",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/errata/RHSA-2026:7519"
            },
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2026-1757"
            },
            {
              "name": "RHBZ#2435940",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2435940"
            },
            {
              "url": "https://gitlab.gnome.org/GNOME/libxml2/-/issues/1009"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-02-02T00:00:00.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-02-02T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Libxml2: memory leak leading to local denial of service in xmllint interactive shell",
          "workarounds": [
            {
              "lang": "en",
              "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-401: Missing Release of Memory after Effective Lifetime"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-1757",
        "datePublished": "2026-02-02T12:38:14.588Z",
        "dateReserved": "2026-02-02T11:43:42.248Z",
        "dateUpdated": "2026-09-01T11:54:59.951Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

SUSE-SU-2026:0605-1

Vulnerability from csaf_suse - Published: 2026-02-24 11:19 - Updated: 2026-02-24 11:19

Summary

Security update for libxml2

Severity

Moderate

Scope

6 vulnerabilities in this advisory, including CVE-2026-1757.

CVE-2026-1757

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Recommended: 21 products

Open the full advisory

SUSE-SU-2026:0606-1

Vulnerability from csaf_suse - Published: 2026-02-24 11:19 - Updated: 2026-09-16 19:05

Summary

Security update for libxml2

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2026-1757.

CVE-2026-1757

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Recommended: 18 products

Open the full advisory

SUSE-SU-2026:0782-1

Vulnerability from csaf_suse - Published: 2026-03-03 13:35 - Updated: 2026-09-16 19:07

Summary

Security update for libxml2

Severity

Moderate

Scope

4 vulnerabilities in this advisory, including CVE-2026-1757.

CVE-2026-1757

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Recommended: 24 products

Open the full advisory

SUSE-SU-2026:20631-1

Vulnerability from csaf_suse - Published: 2026-03-04 10:51 - Updated: 2026-09-16 19:33

Summary

Security update for libxml2, libxslt

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2026-1757.

CVE-2026-1757

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Recommended: 66 products

Open the full advisory

SUSE-SU-2026:20647-1

Vulnerability from csaf_suse - Published: 2026-03-04 10:51 - Updated: 2026-09-16 19:33

Summary

Security update for libxml2, libxslt

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2026-1757.

CVE-2026-1757

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Recommended: 20 products

Open the full advisory

SUSE-SU-2026:20657-1

Vulnerability from csaf_suse - Published: 2026-03-06 11:37 - Updated: 2026-09-16 19:33

Summary

Security update for libxslt, libxml2

Severity

Moderate

Scope

6 vulnerabilities in this advisory, including CVE-2026-1757.

CVE-2026-1757

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Recommended: 20 products

Open the full advisory

SUSE-SU-2026:20707-1

Vulnerability from csaf_suse - Published: 2026-03-06 11:53 - Updated: 2026-09-16 19:34

Summary

Security update for libxslt, libxml2

Severity

Moderate

Scope

6 vulnerabilities in this advisory, including CVE-2026-1757.

CVE-2026-1757

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Recommended: 15 products

Open the full advisory

UBUNTU-CVE-2026-1757 (CVE-2026-1757)

Vulnerability from osv_ubuntu – Published: 2026-02-02 13:15 – Updated: 2026-06-22 22:23 – Source website

Details

Severity

6.2 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-1757	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-1757	REPORT
	https://access.redhat.com/security/cve/CVE-2026-1757	REPORT
	https://ubuntu.com/security/notices/USN-8460-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libxml2-16",
            "binary_version": "2.14.5+dfsg-0.2ubuntu0.2"
          },
          {
            "binary_name": "libxml2-utils",
            "binary_version": "2.14.5+dfsg-0.2ubuntu0.2"
          },
          {
            "binary_name": "python3-libxml2",
            "binary_version": "2.14.5+dfsg-0.2ubuntu0.2"
          }
        ],
        "priority_reason": "Memory leak in command line tool"
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libxml2",
        "purl": "pkg:deb/ubuntu/libxml2@2.14.5+dfsg-0.2ubuntu0.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.14.5+dfsg-0.2ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.12.7+dfsg+really2.9.14-0.4",
        "2.12.7+dfsg+really2.9.14-0.4ubuntu0.1",
        "2.12.7+dfsg+really2.9.14-1",
        "2.14.3+dfsg-0exp1",
        "2.14.3+dfsg-0exp2",
        "2.14.3+dfsg-0exp3",
        "2.14.4+dfsg-0exp1",
        "2.14.5+dfsg-0exp1",
        "2.14.5+dfsg-0exp2",
        "2.14.5+dfsg-0.1",
        "2.14.5+dfsg-0.2",
        "2.14.5+dfsg-0.2ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-1757",
  "modified": "2026-06-22T22:23:16Z",
  "published": "2026-02-02T13:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-1757"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-1757"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-1757"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8460-1"
    }
  ],
  "related": [
    "USN-8460-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-1757"
  ]
}

WID-SEC-W-2026-0284

Vulnerability from csaf_certbund - Published: 2026-02-02 23:00 - Updated: 2026-06-07 22:00

Summary

libxml2 (xmllint): Schwachstelle ermöglicht Denial of Service

Severity

Mittel

Scope

1 vulnerability in this advisory, including CVE-2026-1757.

CVE-2026-1757

Known affected: 4 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-1757 (GCVE-0-2026-1757)

UBUNTU-CVE-2026-1757 (CVE-2026-1757)

Tags

Sightings

Nomenclature

Related by attack behaviour