CVE-2026-16517

Publication date 21 July 2026

Last updated 8 October 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libarchive	26.04 LTS resolute	Fixed 3.8.5-1ubuntu2.3
	24.04 LTS noble	Fixed 3.7.2-2ubuntu0.9
	22.04 LTS jammy	Fixed 3.6.0-1ubuntu1.9
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libarchive	Upstream: 1c6e7b4 Upstream: 4bb52f4

Severity score breakdown

CVSS version: CVSS v3.0

Base score 2.9 · Low

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	Low

Scores

Parameter	Value
Base score	2.9 · Low
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-8902-1
libarchive vulnerability
8 October 2026

Other references

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