ALAS2023-2026-1798

References: CVE-2026-48863  CVE-2026-48864  CVE-2026-9149  CVE-2026-9150 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

A flaw was found in libsolv. A stack-based buffer overflow vulnerability exists in the PGP verification component due to incorrect length handling when copying EdDSA 's' MPI into a stack buffer. A remote attacker could craft a malicious Ed25519 PGP signature with mismatched MPI lengths. Processing this crafted signature could lead to a denial of service in automated package or repository processing workflows. (CVE-2026-48863)

A flaw was found in libsolv. This heap buffer overflow occurs during the decompression of attacker-controlled compressed data within `.solv` files due to insufficient input validation. An attacker can provide a specially crafted `.solv` file, which, when processed by a vulnerable application, can lead to out-of-bounds memory access. This could result in information disclosure, alteration of program execution, or a denial of service. (CVE-2026-48864)

A flaw was found in libsolv. This heap buffer overflow vulnerability occurs when a victim processes a specially crafted .solv file containing negative size values in the repo_add_solv function. This leads to an undersized memory allocation and a subsequent out-of-bounds write. An attacker could exploit this to cause a denial of service (DoS). (CVE-2026-9149)

A flaw was found in libsolv. This stack-based buffer overflow vulnerability occurs in libsolv's Debian metadata parser when processing specially crafted Debian repository metadata. An attacker could exploit this by providing malicious SHA384 or SHA512 checksum tags, leading to memory corruption and a denial of service (DoS) in the affected system. (CVE-2026-9150)

Issue Correction:
Run dnf update libsolv --releasever 2023.12.20260608 or dnf update --advisory ALAS2023-2026-1798 --releasever 2023.12.20260608 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:

aarch64:
    libsolv-tools-0.7.22-1.amzn2023.0.4.aarch64
    python3-solv-debuginfo-0.7.22-1.amzn2023.0.4.aarch64
    libsolv-demo-debuginfo-0.7.22-1.amzn2023.0.4.aarch64
    libsolv-demo-0.7.22-1.amzn2023.0.4.aarch64
    libsolv-debugsource-0.7.22-1.amzn2023.0.4.aarch64
    libsolv-debuginfo-0.7.22-1.amzn2023.0.4.aarch64
    ruby-solv-0.7.22-1.amzn2023.0.4.aarch64
    perl-solv-debuginfo-0.7.22-1.amzn2023.0.4.aarch64
    python3-solv-0.7.22-1.amzn2023.0.4.aarch64
    libsolv-0.7.22-1.amzn2023.0.4.aarch64
    perl-solv-0.7.22-1.amzn2023.0.4.aarch64
    libsolv-devel-0.7.22-1.amzn2023.0.4.aarch64
    ruby-solv-debuginfo-0.7.22-1.amzn2023.0.4.aarch64
    libsolv-tools-debuginfo-0.7.22-1.amzn2023.0.4.aarch64

src:
    libsolv-0.7.22-1.amzn2023.0.4.src

x86_64:
    libsolv-demo-debuginfo-0.7.22-1.amzn2023.0.4.x86_64
    libsolv-demo-0.7.22-1.amzn2023.0.4.x86_64
    libsolv-debuginfo-0.7.22-1.amzn2023.0.4.x86_64
    libsolv-debugsource-0.7.22-1.amzn2023.0.4.x86_64
    ruby-solv-debuginfo-0.7.22-1.amzn2023.0.4.x86_64
    libsolv-tools-debuginfo-0.7.22-1.amzn2023.0.4.x86_64
    libsolv-tools-0.7.22-1.amzn2023.0.4.x86_64
    python3-solv-0.7.22-1.amzn2023.0.4.x86_64
    libsolv-devel-0.7.22-1.amzn2023.0.4.x86_64
    libsolv-0.7.22-1.amzn2023.0.4.x86_64
    perl-solv-debuginfo-0.7.22-1.amzn2023.0.4.x86_64
    python3-solv-debuginfo-0.7.22-1.amzn2023.0.4.x86_64
    perl-solv-0.7.22-1.amzn2023.0.4.x86_64
    ruby-solv-0.7.22-1.amzn2023.0.4.x86_64