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PatchSiren cyber security CVE debrief

CVE-2026-71832 aria2 CVE debrief

Aria2 version 1.37.0 and below is affected by a Divide By Zero issue in src/bittorrent_helper.cc, which allows a remote malicious user to cause a Denial of Service. This vulnerability requires verification of exposure and potential impact, particularly for defenders responsible for systems using Aria2 version 1.37.0 or below. The issue is caused by a divide-by-zero error in the bittorrent_helper.cc file, which can be triggered by a remote attacker. Defenders should assess potential exposure and impact, and consider updating Aria2 to a version above 1.37.0 if available.

Vendor
aria2
Product
aria2
CVSS
MEDIUM 6.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-24
Original CVE updated
2026-09-08
Advisory published
2026-08-24
Advisory updated
2026-09-08

Who should care

Defenders responsible for systems using Aria2 should assess potential exposure and impact. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify if their systems are using Aria2 version 1.37.0 or below and take necessary actions to mitigate the vulnerability.

Why it matters

CVE-2026-71832 is a Denial of Service vulnerability in Aria2 that requires verification of exposure and potential impact, particularly for defenders responsible for systems using Aria2 version 1.37.0 or below.

  • Denial of Service vulnerability requires verification of exposure and potential impact
  • Defenders should assess systems using Aria2 version 1.37.0 or below

Technical summary

Aria2 version 1.37.0 and below is affected by a Divide By Zero issue in src/bittorrent_helper.cc. This vulnerability allows a remote malicious user to cause a Denial of Service. The issue is caused by a divide-by-zero error in the bittorrent_helper.cc file, which can be triggered by a remote attacker. Defenders should prioritize verifying exposure and assessing potential impact.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, as the CVE record indicates a Denial of Service vulnerability.

Recommended defensive actions

  • Verify if the system uses Aria2 version 1.37.0 or below
  • Assess potential exposure to the Denial of Service vulnerability
  • Consider updating Aria2 to a version above 1.37.0 if available

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, but do not offer specific details on exploitation or impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-71832 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-71832

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-71832 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-71832

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.