RHSA-2026:7701

Vulnerability from csaf_redhat - Published: 2026-04-13 06:58 - Updated: 2026-04-19 19:41
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: harfbuzz: * harfbuzz-14.1.0-2.hum1 (aarch64, x86_64) * harfbuzz-cairo-14.1.0-2.hum1 (aarch64, x86_64) * harfbuzz-devel-14.1.0-2.hum1 (aarch64, x86_64) * harfbuzz-gpu-14.1.0-2.hum1 (aarch64, x86_64) * harfbuzz-icu-14.1.0-2.hum1 (aarch64, x86_64) * harfbuzz-raster-14.1.0-2.hum1 (aarch64, x86_64) * harfbuzz-vector-14.1.0-2.hum1 (aarch64, x86_64) * harfbuzz-14.1.0-2.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-22693

A null pointer dereference vector has been discovered in the harfbuzz package. A null pointer dereference vulnerability exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh:1672-1673. The function fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and a Segmentation Fault.

5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-476 - NULL Pointer Dereference
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:7701
Workaround Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
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        "name": "NULL Pointer Dereference"
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      "discovery_date": "2026-01-10T06:01:40.282084+00:00",
      "ids": [
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          "text": "2428439"
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          "category": "description",
          "text": "A null pointer dereference vector has been discovered in the harfbuzz package. A null pointer dereference vulnerability exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh:1672-1673. The function fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and a Segmentation Fault.",
          "title": "Vulnerability description"
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          "text": "This MODERATE severity null pointer dereference in the HarfBuzz library may cause a denial of service (segmentation fault) when memory allocation fails in hb_malloc.\n\nThe issue affects Red Hat products that include and link against HarfBuzz, such as OpenJDK builds with the java.desktop module and certain RHEL components like Firefox and Thunderbird.\n\nThe java-17-openjdk-headless and java-21-openjdk-headless packages do not include java.desktop and do not link against HarfBuzz; therefore, headless-only environments are not affected.",
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        },
        {
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          "title": "CVSS score applicability"
        }
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            "Red Hat Hardened Images:harfbuzz-main@src",
            "Red Hat Hardened Images:harfbuzz-main@x86_64"
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            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:harfbuzz-main@src",
            "Red Hat Hardened Images:harfbuzz-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "harfbuzz: Null Pointer Dereference in harfbuzz"
    }
  ]
}


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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.
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