CVE-2025-68160 (GCVE-0-2025-68160)

Vulnerability from cvelistv5 – Published: 2026-01-27 16:01 – Updated: 2026-01-27 16:01
VLAI?
Title
Heap out-of-bounds write in BIO_f_linebuffer on short writes
Summary
Issue summary: Writing large, newline-free data into a BIO chain using the line-buffering filter where the next BIO performs short writes can trigger a heap-based out-of-bounds write. Impact summary: This out-of-bounds write can cause memory corruption which typically results in a crash, leading to Denial of Service for an application. The line-buffering BIO filter (BIO_f_linebuffer) is not used by default in TLS/SSL data paths. In OpenSSL command-line applications, it is typically only pushed onto stdout/stderr on VMS systems. Third-party applications that explicitly use this filter with a BIO chain that can short-write and that write large, newline-free data influenced by an attacker would be affected. However, the circumstances where this could happen are unlikely to be under attacker control, and BIO_f_linebuffer is unlikely to be handling non-curated data controlled by an attacker. For that reason the issue was assessed as Low severity. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the BIO implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.
Severity ?
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.1 (semver)
Affected: 3.5.0 , < 3.5.5 (semver)
Affected: 3.4.0 , < 3.4.4 (semver)
Affected: 3.3.0 , < 3.3.6 (semver)
Affected: 3.0.0 , < 3.0.19 (semver)
Affected: 1.1.1 , < 1.1.1ze (custom)
Affected: 1.0.2 , < 1.0.2zn (custom)
Create a notification for this product.
Credits
Petr Šimeček (Aisle Research) Stanislav Fort (Aisle Research) Stanislav Fort (Aisle Research) Neil Horman
Show details on NVD website
To clipboard 

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              "version": "3.5.0",
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          "type": "reporter",
          "value": "Stanislav Fort (Aisle Research)"
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          "type": "remediation developer",
          "value": "Stanislav Fort (Aisle Research)"
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      "datePublic": "2026-01-27T14:00:00.000Z",
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              "value": "Issue summary: Writing large, newline-free data into a BIO chain using the\u003cbr\u003eline-buffering filter where the next BIO performs short writes can trigger\u003cbr\u003ea heap-based out-of-bounds write.\u003cbr\u003e\u003cbr\u003eImpact summary: This out-of-bounds write can cause memory corruption which\u003cbr\u003etypically results in a crash, leading to Denial of Service for an application.\u003cbr\u003e\u003cbr\u003eThe line-buffering BIO filter (BIO_f_linebuffer) is not used by default in\u003cbr\u003eTLS/SSL data paths. In OpenSSL command-line applications, it is typically\u003cbr\u003eonly pushed onto stdout/stderr on VMS systems. Third-party applications that\u003cbr\u003eexplicitly use this filter with a BIO chain that can short-write and that\u003cbr\u003ewrite large, newline-free data influenced by an attacker would be affected.\u003cbr\u003eHowever, the circumstances where this could happen are unlikely to be under\u003cbr\u003eattacker control, and BIO_f_linebuffer is unlikely to be handling non-curated\u003cbr\u003edata controlled by an attacker. For that reason the issue was assessed as\u003cbr\u003eLow severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\u003cbr\u003eas the BIO implementation is outside the OpenSSL FIPS module boundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue."
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      "metrics": [
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          "format": "other",
          "other": {
            "content": {
              "text": "Low"
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        "dateUpdated": "2026-01-27T16:01:23.181Z",
        "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "shortName": "openssl"
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          "name": "OpenSSL Advisory",
          "tags": [
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          "url": "https://openssl-library.org/news/secadv/20260127.txt"
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          "tags": [
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          "tags": [
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      "source": {
        "discovery": "UNKNOWN"
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    "assignerShortName": "openssl",
    "cveId": "CVE-2025-68160",
    "datePublished": "2026-01-27T16:01:23.181Z",
    "dateReserved": "2025-12-16T09:20:53.257Z",
    "dateUpdated": "2026-01-27T16:01:23.181Z",
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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