Medium [CVE-2026-82327] Libsolv: libsolv: out-of-bounds write in repo_write via unvalidated directory id from vertical/paged.solv filelist data
This medium-severity Red Hat Linux advisory covers CVE-2026-82327 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
A flaw was found in libsolv, a dependency-resolution library used by RPM-based package managers such as dnf and zypper to work with.solv repository cache files. When libsolv rewrites a.solv cache file, it reads directory-id values from the file's compressed filelist data without validating that they fall within the expected range.
A corrupted or specially crafted.solv cache file (for example, one left in a torn state after an unclean system shutdown) can cause an out-of-bounds memory write when a tool such as dnf, yum, or zypper next processes it.
Successful exploitation is expected to result in a crash of the affected tool (denial of service); it is not expected to allow arbitrary code execution because the out-of-bounds write always stores a fixed, non-attacker-controlled value.
The vulnerable code path is the vertical/paged (lazily loaded) filelist decoder used by repo_write(), reached only when a consumer (e.g. dnf/libdnf) rewrites a.solv cache after having loaded one containing SOLVABLE_FILELIST data stored with KEY_STORAGE_VERTICAL_OFFSET. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-129.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; and 10 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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