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🛡️ CVE-2026-6238 on Debian 11 (Root.io) — glibc

🟡 CVSS 5.0 — Medium ✅ No Known Exploit OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2026-6238 in glibc - Patched by Root

Root has patched CVE-2026-6238 in the glibc package for Root:Debian:11. Multiple fixed versions available.

Distribution advisory

This page covers CVE-2026-6238 as tracked by Debian 11 (Root.io), for the package glibc. The fix is available in version 2.31-13+deb11u14.root.io.14; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

ROOT-OS-DEBIAN-11-CVE-2026-6238 is classified as CWE-126: Buffer Over-read. The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

Affected software

ROOT-OS-DEBIAN-11-CVE-2026-6238 is recorded against 2 packages.

  • glibc (fixed in 2.31-13+deb11u14.root.io.14)
  • rootio-glibc (fixed in 2.31-13+deb11u14.root.io.14)

Timeline and source

Published on 20 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

Other advisories for this package

glibc has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-126: Buffer Over-read) in other software:

CVE-2026-6238 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-08-20
Updated 2026-08-20
Modified 2026-08-20
Fix URL N/A

Affected Packages

Software From version Fixed in
glibc — 2.31-13+deb11u14.root.io.14
rootio-glibc — 2.31-13+deb11u14.root.io.14

References

N/A

Similar Threats

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