🛡️ CVE-2026-16517 on Ubuntu — libarchive

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.

Distribution advisory

This page covers CVE-2026-16517 as tracked by Ubuntu, for the package libarchive. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

UBUNTU-CVE-2026-16517 is classified as CWE-190: Integer Overflow or Wraparound. Arithmetic produces a value too large for its type and wraps around, so a later size or bounds check passes when it should not.

Affected software

UBUNTU-CVE-2026-16517 is recorded against 1 package.

libarchive

Timeline and source

Published on 21 July 2026 and last revised on 29 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-07-21

Updated 2026-08-11

Modified 2026-07-29

Fix URL N/A

Affected Packages

Software	From version	Fixed in
libarchive	—	—

References

REPORT https://ubuntu.com/security/CVE-2026-16517

REPORT https://www.cve.org/CVERecord?id=CVE-2026-16517

🔗 NVD 🔗 Mitre

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