CVE-2026-25506 MUNGE has a buffer overflow in message unpacking allows key leakage and credential forgery
Local attackers can exploit a buffer overflow in MUNGE to leak keys and forge credentials, enabling impersonation of any user including root.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-25506?
CVE-2026-25506 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
MUNGE is an authentication service for creating and validating user credentials. From 0.5 to 0.5.17, local attacker can exploit a buffer overflow vulnerability in munged (the MUNGE authentication daemon) to leak cryptographic key material from process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user (including root) to services that rely on MUNGE for authentication. The vulnerability allows a buffer overflow by sending a crafted message with an oversized address length field, corrupting munged's internal state and enabling extraction of the MAC subkey used for credential verification. This vulnerability is fixed in 0.5.18.
Which versions are affected by CVE-2026-25506?
It affects 2 products.
Linux distribution packages (40)
munge AlmaLinux:10 | All versions | 0.5.15-11.el10_1 |
munge-devel AlmaLinux:10 | All versions | 0.5.15-11.el10_1 |
munge-libs AlmaLinux:10 | All versions | 0.5.15-11.el10_1 |
munge AlmaLinux:8 | All versions | 0.5.13-3.el8_10 |
munge-devel AlmaLinux:8 | All versions | 0.5.13-3.el8_10 |
munge-libs AlmaLinux:8 | All versions | 0.5.13-3.el8_10 |
munge AlmaLinux:9 | All versions | 0.5.13-14.el9_7 |
munge-devel AlmaLinux:9 | All versions | 0.5.13-14.el9_7 |
munge-libs AlmaLinux:9 | All versions | 0.5.13-14.el9_7 |
munge Red Hat:enterprise_linux:10.1 | All versions | 0:0.5.15-11.el10_1 |
munge-debuginfo Red Hat:enterprise_linux:10.1 | All versions | 0:0.5.15-11.el10_1 |
munge-debugsource Red Hat:enterprise_linux:10.1 | All versions | 0:0.5.15-11.el10_1 |
munge-devel Red Hat:enterprise_linux:10.1 | All versions | 0:0.5.15-11.el10_1 |
munge-libs Red Hat:enterprise_linux:10.1 | All versions | 0:0.5.15-11.el10_1 |
munge-libs-debuginfo Red Hat:enterprise_linux:10.1 | All versions | 0:0.5.15-11.el10_1 |
munge Red Hat:enterprise_linux:8::appstream | All versions | 0:0.5.13-3.el8_10 |
munge-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:0.5.13-3.el8_10 |
munge-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:0.5.13-3.el8_10 |
munge-libs Red Hat:enterprise_linux:8::appstream | All versions | 0:0.5.13-3.el8_10 |
munge-libs-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:0.5.13-3.el8_10 |
munge-debuginfo Red Hat:enterprise_linux:8::crb | All versions | 0:0.5.13-3.el8_10 |
munge-debugsource Red Hat:enterprise_linux:8::crb | All versions | 0:0.5.13-3.el8_10 |
munge-devel Red Hat:enterprise_linux:8::crb | All versions | 0:0.5.13-3.el8_10 |
munge-libs-debuginfo Red Hat:enterprise_linux:8::crb | All versions | 0:0.5.13-3.el8_10 |
munge Red Hat:enterprise_linux:9::appstream | All versions | 0:0.5.13-14.el9_7 |
munge-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:0.5.13-14.el9_7 |
munge-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:0.5.13-14.el9_7 |
munge-libs Red Hat:enterprise_linux:9::appstream | All versions | 0:0.5.13-14.el9_7 |
munge-libs-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:0.5.13-14.el9_7 |
munge-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:0.5.13-14.el9_7 |
munge-debugsource Red Hat:enterprise_linux:9::crb | All versions | 0:0.5.13-14.el9_7 |
munge-devel Red Hat:enterprise_linux:9::crb | All versions | 0:0.5.13-14.el9_7 |
munge-libs-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:0.5.13-14.el9_7 |
munge Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.5.15-10.el10_0.1 |
munge-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.5.15-10.el10_0.1 |
munge-debugsource Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.5.15-10.el10_0.1 |
munge-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.5.15-10.el10_0.1 |
munge-libs Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.5.15-10.el10_0.1 |
munge-libs-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.5.15-10.el10_0.1 |
munge Red Hat:rhel_aus:8.2::appstream | All versions | 0:0.5.13-1.el8_2.1 |
Products include Debian Debian Linux, Opensuse Munge.
How do I fix CVE-2026-25506?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-25506 being exploited?
There is no known exploitation of CVE-2026-25506 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALSA-2026:3032, ALSA-2026:3033, ALSA-2026:3034, AZL-77444, AZL-77451, CLSA-2026-1772571803 and 28 more.