Skip to content
OpenAdvisories
Medium ALAS2023-2026-1565 2 CVEs

Moderate: clamav1.5 security update (Amazon Linux 2023)

Published Apr 13, 2026 · Updated Apr 13, 2026

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-33056: tar-rs is a tar archive reading/writing library for Rust. In versions 0.4.44 and below, when unpacking a tar archive, the tar crate's unpack_dir function uses fs::metadata() to check whether a path that already exists is a directory. Because fs::metadata() follows symbolic links, a crafted tarball containing a symlink entry followed by a directory entry with the same name causes the crate to treat the symlink target as a valid existing directory -- and subsequently apply chmod to it. This allows an attacker to modify the permissions of arbitrary directories outside the extraction root. This issue has been fixed in version 0.4.45. CVE-2026-33055: tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. This is almost the inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust tar) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go archive/tar) unconditionally use the PAX size override. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45.

Fixed packages 15

ReleasePackageFixed in
Amazon Linux · 2023 clamav1.5 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-data 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-debuginfo 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-debugsource 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-devel 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-doc 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-filesystem 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-freshclam 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-freshclam-debuginfo 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-lib 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-lib-debuginfo 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-milter 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamav1.5-milter-debuginfo 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamd1.5 0:1.5.1-1.amzn2023.0.5
Amazon Linux · 2023 clamd1.5-debuginfo 0:1.5.1-1.amzn2023.0.5

Vulnerabilities 2

  • Medium 5.1

    tar-rs incorrectly ignores PAX size headers if header size is nonzero

    tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to co…

  • Medium 5.1

    tar-rs: unpack_in can chmod arbitrary directories by following symlinks

    tar-rs is a tar archive reading/writing library for Rust. In versions 0.4.44 and below, when unpacking a tar archive, the tar crate's unpack_dir function uses fs::metadata() to check whether a path that already exists is a directory. Because fs::metadata() fo…

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-33055.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-33056.html