CVE-2026-9149 Libsolv: heap buffer overflow in libsolv repo_add_solv via negative maxsize from crafted .solv file
A heap buffer overflow in libsolv allows attackers to cause denial of service by processing crafted .solv files with negative size values.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-9149?
CVE-2026-9149 is a medium-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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).
Weakness: CWE-122
Which versions are affected by CVE-2026-9149?
It affects 6 products.
Products include Opensuse Libsolv, Redhat Enterprise Linux, Redhat Hardened Images, Redhat Openshift Container Platform, Redhat Satellite, Redhat Update Infrastructure.
How do I fix CVE-2026-9149?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-9149 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9149 exists.
Other vulnerabilities in Redhat Enterprise Linux
Sources
Also known as AZL-88056, CLSA-2026-1780923998, CLSA-2026-1781095521, DEBIAN-CVE-2026-9149, GHSA-9q56-xf64-q987, UBUNTU-CVE-2026-9149.