CVE-2026-123501

Description

Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated users to exhaust server memory through concurrent image decodes in avatar and background uploads. Attackers can send several parallel tiny, highly compressible PNGs decoded at up to 50 megapixels each, pushing the API process into memory pressure or an OOM kill.

Overview

State: PUBLISHED
Assigner (CNA): VulnCheck
CVSS severity: HIGH
CVSS score: 7.1 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Effective score: 7.1 / 10 HIGH source: CNA overview
CWE(s): CWE-400
Reserved: 2026-11-06
Published: 2026-11-08 01:37 UTC
Last updated: 2026-11-08 01:37 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/123xxx/CVE-2026-123501.json
Linked Threat: CVE-2026-123501 — Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-11-08 02:16:37 UTC
NVD last modified: 2026-11-08 02:16:37 UTC
NVD CVSS v3.1: 6.5 / 10 MEDIUM source: disclosure@vulncheck.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 2.8 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.0031 (probability of exploitation in next 30 days)
EPSS percentile: 23.64% vs all CVEs — higher = more likely to be exploited, as of 2026-11-08

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-119386
Assigner: VulnCheck
Published: Nov 8, 2026, 1:37:17 AM
Updated: Nov 8, 2026, 1:37:17 AM
EUVD base score (CVSS 4.0): 7.1 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EUVD-reported EPSS: 0.0000
Vendors: go-vikunja
Products: vikunja (0 <2.7.1)
Aliases: GHSA-qgpv-qrrx-2qgv

ENISA description: Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated users to exhaust server memory through concurrent image decodes in avatar and background uploads. Attackers can send several parallel tiny, highly compressible PNGs decoded at up to 50 megapixels each, pushing the API process into memory pressure or an OOM kill.

EUVD references (2)

Affected products (1)

Vendor	Product	Versions	Platforms
go-vikunja	vikunja	`0` (affected), `2.7.1` (unaffected)	—

Vendor references (2)

References embedded in the original CVE record by the assigning CNA.

GitHub Security Advisory (GHSA-9hxw-pxcq-4q8q) vendor-advisory
VulnCheck Advisory: Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes third-party-advisory

MITRE references (2) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

GitHub Security Advisory (GHSA-9hxw-pxcq-4q8q) vendor-advisory
VulnCheck Advisory: Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes third-party-advisory

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-9hxw-pxcq-4q8q disclosure@vulncheck.com
https://www.vulncheck.com/advisories/vikunja-before-2.7.1-memory-exhaustion-dos-via-unbounded-image-decodes disclosure@vulncheck.com

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

September 2026 Critical Security Patch Update Released

web:blogs.oracle.com

For more information about the Critical Security Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-11-08 10:26 UTC
CVE Database Search & Remediation Guidance

web:cvedatabase.com

Search and analyze CVE vulnerabilities with instant access to CVSS scores, affected products, and remediation guidance.

2026-11-08 10:26 UTC
Microsoft Patch Tracker (November 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-11-08 10:26 UTC
ArcGIS Server Security 2026 Update 4 Patch - Esri Support

web:support.esri.com

The issues resolved by these patches are listed in the Issues addressed with this patch section below. As part of the patch installation, the ArcGIS Server service is stopped and restarted. The restart may take several minutes depending on the number of services published on the ArcGIS Server site. This patch can be uninstalled as outlined in the Uninstalling this patch on Windows and ...

2026-11-08 10:26 UTC
What Is CVE Remediation in 2026? - aikido.dev

web:www.aikido.dev

CVE remediation is fixing known flaws in the software you run. Why upgrading often fails, what remediation actually involves, and how backporting fixes it.

2026-11-08 10:26 UTC
Security Bulletin: IBM MQ is vulnerable to unauthenticated remote code ...

web:www.ibm.com

IBM MQ has addressed a JNDI injection vulnerability in the Jakarta Resource Adapter IVT servlet that could allow an unauthenticated remote attacker to execute ...

2026-11-08 10:26 UTC
Patch now: PHP2Shell, Brotli, and eMudhra guidance for customers

web:www.microsoft.com

If you can't patch immediately: Apply the PHP project's interim mitigations and the Azure WAF protections. Note: This reduces exposure but doesn't fix the underlying vulnerabilities.

2026-11-08 10:26 UTC
The 8 Best Automated Vulnerability Remediation Tools in 2026

web:www.openhands.dev

Compare 8 automated vulnerability remediation tools for 2026 on fixes, prioritization, integrations, and deployment control.

2026-11-08 10:26 UTC
Oracle Critical Security Patch Update Advisory - June 2026

web:www.oracle.com

Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...

2026-11-08 10:26 UTC
Oracle Critical Security Patch Update Advisory - September 2026

web:www.oracle.com

Prior Critical Patch Update and Critical Security Patch Update advisories should be reviewed for information regarding earlier published security patches. Refer to Critical Patch Updates, Critical Security Patch Updates, Security Alerts and Bulletins for information about Oracle Security advisories.

2026-11-08 10:26 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-123501.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:golang/code.vikunja.io/api",
          "product": "vikunja",
          "vendor": "go-vikunja",
          "versions": [
            {
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.7.1",
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            }
          ]
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      ],
      "cpeApplicability": [
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
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      "descriptions": [
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        }
      ],
      "metrics": [
        {
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            "Recovery": "NOT_DEFINED",
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            "attackVector": "NETWORK",
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            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
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            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
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          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-08T01:37:17.692Z",
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        "shortName": "VulnCheck"
      },
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          "tags": [
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          ],
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        },
        {
          "name": "VulnCheck Advisory: Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/vikunja-before-2.7.1-memory-exhaustion-dos-via-unbounded-image-decodes"
        }
      ],
      "title": "Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
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    "dateReserved": "2026-11-06T00:45:39.026Z",
    "dateUpdated": "2026-11-08T01:37:17.692Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}