CVE-2026-5928 (GCVE-0-2026-5928)

Vulnerability from cvelistv5 – Published: 2026-04-20 20:37 – Updated: 2026-07-14 12:45
VLAI
Title
Potential buffer under-read in ungetwc
Summary
Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or earlier, may result in an attempt to read bytes before an allocated buffer, potentially resulting in unintentional disclosure of neighboring data in the heap, or a program crash. A bug in the wide character pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc() to operate on the regular character buffer (fp->_IO_read_ptr) instead of the actual wide-stream read pointer (fp->_wide_data->_IO_read_ptr). The program crash may happen in cases where fp->_IO_read_ptr is not initialized and hence points to NULL. The buffer under-read requires a special situation where the input character encoding is such that there are overlaps between single byte representations and multibyte representations in that encoding, resulting in spurious matches. The spurious match case is not possible in the standard Unicode character sets.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-21 16:10 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
The GNU C Library glibc Affected: 2.1.1-89 , ≤ 2.43 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < V3.1.6 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < V3.1.6 (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < V3.1.6 (custom)
guessed Create a notification for this product.
Credits
Rocket Ma
Show details on NVD website
To clipboard 

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            "orgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
            "shortName": "glibc"
          },
          "references": [
            {
              "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=33998"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Potential buffer under-read in ungetwc",
          "x_generator": {
            "engine": "Vulnogram 1.0.1"
          }
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      },
      "cveMetadata": {
        "assignerOrgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
        "assignerShortName": "glibc",
        "cveId": "CVE-2026-5928",
        "datePublished": "2026-04-20T20:37:31.743Z",
        "dateReserved": "2026-04-08T22:47:29.814Z",
        "dateUpdated": "2026-04-30T15:43:07.240Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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

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.



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.