# CVE-2026-82327: libsolv out-of-bounds write in .solv cache file handling

Source: https://junglewise.ai/threats/cve-2026-82327-libsolv-out-of-bounds-write-in-solv-cache-file-handling  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-28. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-82327 · Severity: medium · CVSS 5.5 · Published 2026-08-28

libsolv is a dependency-resolution library used by package managers (like dnf, yum, and zypper) to manage software updates on Linux systems. A flaw in how it reads .solv cache files can cause the package manager to crash when processing a corrupted or malicious cache file, disrupting software update operations. The crash is the primary impact; the vulnerability cannot be exploited for code execution.

## Quick answers

**Is CVE-2026-82327 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82327 being exploited in the wild.

**How severe is CVE-2026-82327?** Medium severity, with a CVSS score of 5.5, published 28 August 2026.

**Which products and versions are affected?** libsolv project libsolv <unknown>.

**Is there a fix for CVE-2026-82327?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-82327 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-82327?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an improper array index validation (CWE-129) in libsolv's vertical/paged filelist decoder. When libsolv rewrites a .solv cache file via repo_write(), it reads directory-id values from compressed filelist data without bounds checking, allowing an out-of-bounds memory write. Attack vector is local; an attacker must craft or corrupt a .solv cache file and cause a victim tool (dnf/yum/zypper) to process it. User interaction is required (the tool must be invoked to process the cache). The out-of-bounds write stores a fixed, non-attacker-controlled constant value, reliably resulting in a denial-of-service crash rather than code execution or data compromise. A patch is not yet available as of the advisory date.

## Affected products

- libsolv project libsolv <unknown>

## Timeline

- 2026-08-28: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-82327](https://access.redhat.com/security/cve/CVE-2026-82327)