CVE-2023-47038: Perl: write past buffer end via illegal user-defined unicode property
Noroxi assessment
Priority: Monitor (action score 31/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.81% (FIRST EPSS); higher than 57.2% of all records.
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: github.com/Perl/perl5 perl 5.34.3, 5.36.3, 5.38.2.
Low priority for now. Upgrade to github.com/Perl/perl5 perl 5.34.3, 5.36.3, 5.38.2 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
A vulnerability was found in perl 5.30.0 through 5.38.0. This issue occurs when a crafted regular expression is compiled by perl, which can allow an attacker controlled byte buffer overflow in a heap allocated buffer.
- Published
- Dec 18, 2023
- Updated
- Jun 17, 2026
- EPSS
- 0.8% · 57th percentile
- CWE
- CWE-122
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.8
- CNA · redhat
- 7.0
- 0.8 point gap
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| perl | perl | cpe:2.3:a:perl:perl |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux aus | cpe:2.3:o:redhat:enterprise_linux_aus |
| redhat | enterprise linux eus | cpe:2.3:o:redhat:enterprise_linux_eus |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora39
- perl perl5.30.0 and later · up to 5.38.0 inclusive
- redhat enterprise linux8.0
- redhat enterprise linux9.0
- redhat enterprise linux aus9.4
- redhat enterprise linux eus9.4
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
github.com/Perl/perl5 perl
- 5.30.0 and later · before 5.34.3affected · semver
- 5.36.0 and later · before 5.36.3affected · semver
- 5.38.0 and later · before 5.38.2affected · semver
Red Hat Red Hat Enterprise Linux 6
- all versionsunknown
Red Hat Red Hat Enterprise Linux 7
- all versionsunknown
Red Hat Red Hat Enterprise Linux 8
- 8100020240314121426.9fe1d287 and laternot affected · rpm
- all versionsunknown
- all versionsaffected
Red Hat Red Hat Enterprise Linux 9
- 4:5.32.1-481.el9 and laternot affected · rpm
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | perl | before 4:5.32.1-473.module_el8.10.0+3779+d5938d28 | 4:5.32.1-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-Algorithm-Diff | before 1.1903-10.module_el8.6.0+2766+8bf0b7ce | 1.1903-10.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-Archive-Tar | before 2.38-3.module_el8.6.0+2766+8bf0b7ce | 2.38-3.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-Archive-Zip | before 1.68-3.module_el8.6.0+2766+8bf0b7ce | 1.68-3.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-Attribute-Handlers | before 1.01-473.module_el8.10.0+3779+d5938d28 | 1.01-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-autodie | before 2.34-1.module_el8.6.0+2766+8bf0b7ce | 2.34-1.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-AutoLoader | before 5.74-473.module_el8.10.0+3779+d5938d28 | 5.74-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-AutoSplit | before 5.74-473.module_el8.10.0+3779+d5938d28 | 5.74-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-autouse | before 1.11-473.module_el8.10.0+3779+d5938d28 | 1.11-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-B | before 1.80-473.module_el8.10.0+3779+d5938d28 | 1.80-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-base | before 2.27-473.module_el8.10.0+3779+d5938d28 | 2.27-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-Benchmark | before 1.23-473.module_el8.10.0+3779+d5938d28 | 1.23-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-bignum | before 0.51-439.module_el8.6.0+2766+8bf0b7ce | 0.51-439.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-blib | before 1.07-473.module_el8.10.0+3779+d5938d28 | 1.07-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-Carp | before 1.50-439.module_el8.6.0+2766+8bf0b7ce | 1.50-439.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-Class-Struct | before 0.66-473.module_el8.10.0+3779+d5938d28 | 0.66-473.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-Compress-Bzip2 | before 2.28-2.module_el8.6.0+3181+91434291 | 2.28-2.module_el8.6.0+3181+91434291 |
| AlmaLinux:8 | perl-Compress-Bzip2 | before 2.28-2.module_el8.6.0+2766+8bf0b7ce | 2.28-2.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-Compress-Raw-Bzip2 | before 2.096-1.module_el8.6.0+3181+91434291 | 2.096-1.module_el8.6.0+3181+91434291 |
| AlmaLinux:8 | perl-Compress-Raw-Bzip2 | before 2.096-1.module_el8.6.0+2766+8bf0b7ce | 2.096-1.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-Compress-Raw-Lzma | before 2.096-1.module_el8.6.0+2766+8bf0b7ce | 2.096-1.module_el8.6.0+2766+8bf0b7ce |
| AlmaLinux:8 | perl-Compress-Raw-Lzma | before 2.096-1.module_el8.6.0+3181+91434291 | 2.096-1.module_el8.6.0+3181+91434291 |
| AlmaLinux:8 | perl-Compress-Raw-Zlib | before 2.096-2.module_el8.10.0+3779+d5938d28 | 2.096-2.module_el8.10.0+3779+d5938d28 |
| AlmaLinux:8 | perl-Config-Extensions | before 0.03-473.module_el8.10.0+3779+d5938d28 | 0.03-473.module_el8.10.0+3779+d5938d28 |
+96
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
Published before and after this one in the same product
- ← EarlierCVE-2023-31486Apr 28, 2023 · HTTP::Tiny before 0.083, a Perl core module since 5.13.9 and available standalone on CPAN, has an insecure default TLS configuration where u33Monitor
- ← EarlierCVE-2022-48522Aug 22, 2023 · In Perl 5.34.0, function S_find_uninit_var in sv.c has a stack-based crash that can lead to remote code execution or local privilege escalat40Plan
- Later →CVE-2023-47039Jan 2, 2024 · Perl: perl for windows binary hijacking vulnerability31Monitor
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 |
|---|---|---|
| github.com/Perl/perl5 perl | 5.34.3 | Vendor (CNA) |
| github.com/Perl/perl5 perl | 5.36.3 | Vendor (CNA) |
| github.com/Perl/perl5 perl | 5.38.2 | Vendor (CNA) |
| almalinux:perl | 4:5.32.1-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-Attribute-Handlers | 1.01-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-AutoLoader | 5.74-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-AutoSplit | 5.74-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-B | 1.80-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-Benchmark | 1.23-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-Class-Struct | 0.66-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-Config-Extensions | 0.03-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-DBM_Filter | 0.06-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-Devel-Peek | 1.28-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-Devel-SelfStubber | 1.06-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:perl-DirHandle | 1.05-481.el9 · AlmaLinux:9 | Package registry (OSV) |
| alpine:perl | 5.34.2-r0 · Alpine:v3.15 | Package registry (OSV) |
| debian:perl | 5.36.0-7+deb12u1 · Debian:12 | Package registry (OSV) |
| opensuse:perl | 5.38.2-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:perl | 4:5.32.1-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-Attribute-Handlers | 0:1.01-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-AutoLoader | 0:5.74-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-AutoSplit | 0:5.74-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-B | 0:1.80-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-B-debuginfo | 0:1.80-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-Benchmark | 0:1.23-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-Class-Struct | 0:0.66-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-Config-Extensions | 0:0.03-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-DBM_Filter | 0:0.06-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-Devel-Peek | 0:1.28-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:perl-Devel-Peek-debuginfo | 0:1.28-481.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
+12
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.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
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.
- CVE-2024-56406482 days apartPerl is vulnerable to a heap buffer overflow when transliterating non-ASCII bytes33Monitor
- CVE-2023-4703915 days apartPerl: perl for windows binary hijacking vulnerability31Monitor
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
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-122 · Heap-based Buffer OverflowCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (13 more)Show less
- access.redhat.com/errata/RHSA-2024:3128
- access.redhat.com/security/cve/CVE-2023-47038
- bugs.debian.org/cgi-bin/bugreport.cgi?bug=1056746
- bugzilla.redhat.com/show_bug.cgi?id=2249523
- github.com/Perl/perl5/commit/12c313ce49b36160a7ca2e9b07ad5bd92ee4a010
- github.com/Perl/perl5/commit/7047915eef37fccd93e7cd985c29fe6be54650b6
- github.com/Perl/perl5/commit/ff1f9f59360afeebd6f75ca1502f5c3ebf077da3
- github.com/aquasecurity/trivy/discussions/8400
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GNEEWAACXQCEEAKSG7XX2D5YDRWLCIZJ/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UMDZZ4SCEW6FRWZDMXGAKZ35THTAWFG6/
- perldoc.perl.org/perl5382delta#CVE-2023-47038-Write-past-buffer-end-via-illegal-user-defined-Unicode-property
- ubuntu.com/security/CVE-2023-47100
- www.suse.com/security/cve/CVE-2023-47100.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.