An issue was discovered in Perl 5.22 through 5.26.
An issue was discovered in Perl 5.22 through 5.26. Matching a crafted locale dependent regular expression can cause a heap-based buffer over-read and potentially information disclosure.
- Published
- Apr 17, 2018
- Updated
- Jun 16, 2026
- EPSS
- 3.9% · 90th percentile
- CWE
- CWE-125
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.9%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| perl | perl | cpe:2.3:a:perl:perl |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux17.10
- debian debian linux7.0
- debian debian linux8.0
- debian debian linux9.0
- perl perl5.22 and later · up to 5.26 inclusive
- redhat enterprise linux server6.0
- redhat enterprise linux server7.0
- redhat enterprise linux server7.3
- redhat enterprise linux server7.4
- redhat enterprise linux server7.5
- redhat enterprise linux workstation6.0
- redhat enterprise linux workstation7.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | perl | from 5.22 · before 5.26.2-r0 | 5.26.2-r0 |
| Alpine:v3.5 | perl | from 5.22 · before 5.24.4-r0 | 5.24.4-r0 |
| Debian:12 | perl | before 5.26.1-6 | 5.26.1-6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl | before 4:5.24.0-380.el6 | 4:5.24.0-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Attribute-Handlers | before 0:0.99-380.el6 | 0:0.99-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-bignum | before 0:0.42-380.el6 | 0:0.42-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-core | before 0:5.24.0-380.el6 | 0:5.24.0-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-debuginfo | before 4:5.24.0-380.el6 | 4:5.24.0-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-devel | before 4:5.24.0-380.el6 | 4:5.24.0-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Devel-Peek | before 0:1.23-380.el6 | 0:1.23-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Devel-SelfStubber | before 0:1.05-380.el6 | 0:1.05-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Errno | before 0:1.25-380.el6 | 0:1.25-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-ExtUtils-Embed | before 0:1.33-380.el6 | 0:1.33-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-ExtUtils-Miniperl | before 0:1.05-380.el6 | 0:1.05-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-IO | before 0:1.36-380.el6 | 0:1.36-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-IO-Zlib | before 1:1.10-380.el6 | 1:1.10-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-libnetcfg | before 4:5.24.0-380.el6 | 4:5.24.0-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-libs | before 4:5.24.0-380.el6 | 4:5.24.0-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Locale-Maketext-Simple | before 1:0.21-380.el6 | 1:0.21-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-macros | before 4:5.24.0-380.el6 | 4:5.24.0-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Math-BigInt-FastCalc | before 0:0.40-380.el6 | 0:0.40-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Math-BigRat | before 0:0.2608.02-380.el6 | 0:0.2608.02-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Math-Complex | before 0:1.59-380.el6 | 0:1.59-380.el6 |
| Red Hat:rhel_software_collections:3::el6 | rh-perl524-perl-Memoize | before 0:1.03-380.el6 | 0:1.03-380.el6 |
+45
Same product
perl: all recordsOther highest-scoring records for the same primary product.
- CVE-2012-6329The _compile function in Maketext.pm in the Locale::Maketext implementation in Perl before 5.17.7 does not properly handle backslashes and f49Plan
- CVE-2018-18311Perl 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.43Plan
- CVE-2018-18312Perl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.43Plan
- CVE-2018-6913Heap-based buffer overflow in the pack function in Perl before 5.26.2 allows context-dependent attackers to execute arbitrary code via a lar42Plan
- CVE-2018-18314Perl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations.41Plan
- CVE-2018-6797An issue was discovered in Perl 5.18 through 5.26.41Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:perl | 5.26.2-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:perl | 5.26.1-6 · Debian:12 | Package registry (OSV) |
| opensuse:perl | 5.26.1-150300.17.17.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| red hat:rh-perl524-perl | 4:5.24.0-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-Attribute-Handlers | 0:0.99-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-Devel-Peek | 0:1.23-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-Devel-SelfStubber | 0:1.05-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-Errno | 0:1.25-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-ExtUtils-Embed | 0:1.33-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-ExtUtils-Miniperl | 0:1.05-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-IO | 0:1.36-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-IO-Zlib | 1:1.10-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-Locale-Maketext-Simple | 1:0.21-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-Math-BigInt-FastCalc | 0:0.40-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:rh-perl524-perl-Math-BigRat | 0:0.2608.02-380.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| suse:perl | 5.10.0-64.81.10.1 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
| suse:perl | 5.26.1-150300.17.17.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- www.securitytracker.com/id/1040681
- access.redhat.com/errata/RHSA-2018:1192
- rt.perl.org/Public/Bug/Display.html?id=132063
- security.gentoo.org/glsa/201909-01
- usn.ubuntu.com/3625-1/
- www.debian.org/security/2018/dsa-4172
- www.oracle.com/security-alerts/cpujul2020.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.