CVE-2026-83742 (GCVE-0-2026-83742)

Vulnerability from cvelistv5 – Published: 2026-10-07 02:41 – Updated: 2026-10-07 11:30
VLAI
Title
wstrncat() unsigned integer underflow leads to an off-by-one null write in wolfSSH on non-Windows platforms
Summary
Unsigned integer underflow in wstrncat() in src/port.c in wolfSSL wolfSSH from v1.4.11 through v1.5.0 on non-Windows platforms allows an authenticated remote attacker to write one out-of-bounds null byte past the end of a stack buffer by sending a crafted SFTP path. wolfSSH_RealPath() in src/ssh.c appends each path component with a remaining-size bound (outSz - curSz) rather than the full destination size, so once the accumulated path reaches half the output buffer the size_t computation n - strlen(s1) - 1 wraps to near SIZE_MAX. The strncat() call is then effectively unbounded and copies the whole component; when that component exactly fills the remainder of the buffer, its terminating null is written one byte past the end. The caller's own length check keeps the copied data inside the buffer, so the overflow is limited to that single null byte, which may corrupt an adjacent stack value and crash the process. Applications that call the public wolfSSH_RealPath() with an output buffer smaller than the input path are additionally exposed to an unbounded copy, because the word32 expression outSz - segSz in that length check also wraps.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 11:30 UTC
CWE
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
  • CWE-121 - Stack-based Buffer Overflow
  • CWE-193 - Off-by-one Error
Impacted products
Vendor Product Version CPE status
wolfSSL Inc. wolfSSH Affected: 1.4.11 , ≤ 1.5.0 (semver)
guessed Create a notification for this product.
Show details on NVD website

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            "shortName": "wolfSSL"
          },
          "references": [
            {
              "name": "Fix PR #1084",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/wolfSSL/wolfssh/pull/1084"
            },
            {
              "name": "Fix commit 822e4464 (guard the free space calculation in wstrncat)",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/wolfSSL/wolfssh/commit/822e4464560b467580ea37a2fc03b0988d88b71f"
            },
            {
              "name": "Fix commit 513e52b1 (bounded scan replacing strlen in wstrncat)",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/wolfSSL/wolfssh/commit/513e52b18927a4e3f7cf17ecaf107958e56139de"
            },
            {
              "name": "Hardening commit fbc7cd88 (wolfSSH_RealPath length check and append bounds)",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/wolfSSL/wolfssh/commit/fbc7cd88a23b59a45a584020a4c7242d9bd70f35"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "wstrncat() unsigned integer underflow leads to an off-by-one null write in wolfSSH on non-Windows platforms",
          "x_generator": {
            "engine": "Vulnogram 1.0.5"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "assignerShortName": "wolfSSL",
        "cveId": "CVE-2026-83742",
        "datePublished": "2026-10-07T02:41:48.911Z",
        "dateReserved": "2026-08-31T22:49:43.798Z",
        "dateUpdated": "2026-10-07T11:30:28.937Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.
  • 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.

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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.


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