An issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-read.

The CentOS Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS6:CLSA-2026:1793174768 advisory.

  - An issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-     read. (CVE-2020-23922)

  - Buffer Overflow vulnerability in GifLib Project GifLib v.5.2.1 allows a local attacker to obtain sensitive     information via the DumpSCreen2RGB function in gif2rgb.c (CVE-2023-48161)

  - Giflib contains a double-free vulnerability that is the result of a shallow copy in GifMakeSavedImage and     incorrect error handling. The conditions needed to trigger this vulnerability are difficult but may be     possible. (CVE-2026-23868)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - An issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-
    read. (CVE-2020-23922)

The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1781348390 advisory.

  - An issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-     read. (CVE-2020-23922)

  - There is a heap-buffer-overflow in GIFLIB 5.2.1 function DumpScreen2RGB() in gif2rgb.c:298:45.
    (CVE-2022-28506)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-     read. (CVE-2020-23922)

Note that Nessus relies on the presence of the package as reported by the vendor.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-075 advisory.

    An issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-     read. (CVE-2020-23922)

    There is a heap-buffer-overflow in GIFLIB 5.2.1 function DumpScreen2RGB() in gif2rgb.c:298:45.
    (CVE-2022-28506)

    Buffer Overflow vulnerability in GifLib Project GifLib v.5.2.1 allows a local attacker to obtain sensitive     information via the DumpSCreen2RGB function in gif2rgb.c (CVE-2023-48161)

    Giflib Project v5.2.2 is vulnerable to a heap buffer overflow via gif2rgb. (CVE-2024-45993)

    NOTE: https://www.openwall.com/lists/oss-security/2025/04/07/3NOTE:
    https://sourceforge.net/p/giflib/bugs/176/ (CVE-2025-31344)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
374842	CentOS Linux 6 [TuxCare] Security Update: giflib / giflib-devel / giflib-utils Multiple Vulnerabilities (CENTOS6:CLSA-2026:1793174768)	Nessus	CentOS Local Security Checks	Local	high
457329	Echo: giflib: security update to 5.2.2-1	Tenable Cloud Security	Echo Local Security Checks	Local	high
457329	Echo: giflib: security update to 5.2.2-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
352570	AlmaLinux 9.2 [TuxCare] Security Update: giflib / giflib-devel / giflib-utils Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1781348390)	Nessus	Alma Linux Local Security Checks	Local	high
229923	Linux Distros Unpatched Vulnerability : CVE-2020-23922	Nessus	Misc.	Local	high
173083	Amazon Linux 2023 : giflib, giflib-devel, giflib-utils (ALAS2023-2023-075)	Nessus	Amazon Linux Local Security Checks	Local	high

Detections

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CVE-2020-23922

high

Tenable Plugins

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high