CVE-2026-38821 (GCVE-0-2026-38821)

Vulnerability from cvelistv5 – Published: 2026-08-28 00:10 – Updated: 2026-08-28 00:10
VLAI
Summary
A heap-based buffer overflow vulnerability exists in openNDS before 11.0.0 that allows an unauthenticated attacker on the captive portal network to crash the openNDS daemon (denial of service) and potentially achieve remote code execution. This is in http_microhttpd.c.
CWE
  • CWE-122 - Heap-based Buffer Overflow
Impacted products
Vendor Product Version CPE status
openNDS openNDS Affected: 0 , < 11.0.0 (semver)
    cpe:2.3:a:opennds:opennds:*:*:*:*:*:*:*:*
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Show details on NVD website

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • 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.

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