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    CVE-2020-11721

    load_png in loader.c in libsixel.a in libsixel 1.8.6 has an uninitialized pointer leading to an invalid call to free, which can cause a denial of service.

    Published:Apr 12, 2020
    Last Modified:Apr 24, 2026
    EPS:Apr 12, 2020
    EPSS Score:0.00468
    CVSS Score:6.5

    Affected Products

    Vendor
    Saitoha
    Product
    Libsixel

    Exploits

    https://github.com/saitoha/libsixel/issues/134https://github.com/saitoha/libsixel/issues/134

    Common Weakness Enumeration

    CWE-824 Access of Uninitialized Pointer

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-44637 (CVSS 7.1) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a signed int…
    CVE-2026-44636 (CVSS 7.4) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, signed integ…
    CVE-2026-44638 (CVSS 2.5) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL…
    CVE-2026-33023 (CVSS 7.8) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. In versions 1.8.7 and prior, wh…
    CVE-2026-33021 (CVSS 7.3) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contai…
    CVE-2026-33020 (CVSS 7.1) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contai…
    CVE-2026-33019 (CVSS 7.1) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contai…
    CVE-2026-33018 (CVSS 7) — libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contai…
    CVE-2025-61146 (CVSS 4) — saitoha libsixel until v1.8.7 was discovered to contain a memory leak via the component malloc_stub.c.…
    CVE-2025-9300 (CVSS 1.9) — A vulnerability was found in saitoha libsixel up to 1.10.3. Affected by this issue is the function sixel_debug…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High