# The GNU C Library security advisories update for 2026-11-11

Source: [Open Source Security](https://seclists.org/oss-sec/2026/q4/657) · 2026-11-11 · Security
Page: https://themorning.dev/story/the-gnu-c-library-security-advisories-update-for-2026-11-11-4cdc64f98ebb40f1
Kind: security · Impact: medium

## In brief

- The GNU C Library published security advisory GLIBC-SA-2026-0027 on 2026-11-11, as part of its November 2026 advisories.
- The advisory describes a one-byte buffer overflow in the scanf %s and %[ conversions for wide characters.
- Calling the wide scanf family of functions (swscanf, fwscanf, wscanf) is the trigger described in the excerpt available.

## Why it matters

Software that calls glibc's wide scanf functions may be affected by a memory-safety bug, so developers should check whether their code uses these functions and whether their glibc version is patched.

## What to do

- Read the full GLIBC-SA-2026-0027 advisory to confirm affected versions and the fix

## Timeline

- 2026-11-11: GLIBC-SA-2026-0027 security advisory published

## Coverage

- [The GNU C Library security advisories update for 2026-11-11](https://seclists.org/oss-sec/2026/q4/657) — Open Source Security, 2026-11-11

Tags: glibc, security, buffer-overflow, c-library, scanf

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