NVD / CVE Program· CNA mitre

CVE-2026-32746: telnetd in GNU inetutils through 2.7 allows an out-of-bounds write in the LINEMODE SLC (Set Local Characters) suboption handler because add_

Noroxi assessment

Priority: Plan (action score 52/100)

Public proof-of-concept code exists (Exploit-DB, GitHub); there is no record of exploitation in the wild.
Probability of exploitation in the next 30 days: 44.8% (FIRST EPSS); higher than 98.7% of all records.
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.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: inetutils-telnet (Alpine:v3.24) 2.8-r0; inetutils (Debian:12) 2:2.4-2+deb12u3; inetutils (Debian:13) 2:2.6-3+deb13u3.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Upgrade to inetutils-telnet (Alpine:v3.24) 2.8-r0; inetutils (Debian:12) 2:2.4-2+deb12u3; inetutils (Debian:13) 2:2.6-3+deb13u3 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

telnetd in GNU inetutils through 2.7 allows an out-of-bounds write in the LINEMODE SLC (Set Local Characters) suboption handler because add_slc does not check whether the buffer is full.

CriticalCVSS 9.8 · v3.1—Proof of concept Fix available

Published: Mar 13, 2026
Updated: Jun 17, 2026
EPSS: 44.8% · 98th percentile
CWE: CWE-120

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Action score

Plan

Add it to your regular patch cycle.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 13 / 30 · 44.8%

CISA SSVC decision

Exploitation: proof of concept
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · mitre: 9.8; NVD has not scored this yet; the score shown is the CNA’s.

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
Proof of concept exists, no weaponized module
A fix has been released

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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.

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Affected 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
gnu	inetutils	cpe:2.3:a:gnu:inetutils

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

gnu inetutilsup to 2.7 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mitre). Independent of NVD's CPE analysis and usually ahead of it.

GNU inetutils
- up to and including 2.7affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Alpine:v3.24	inetutils-telnet	before 2.8-r0	2.8-r0
Debian:12	inetutils	before 2:2.4-2+deb12u3	2:2.4-2+deb12u3
Debian:13	inetutils	before 2:2.6-3+deb13u3	2:2.6-3+deb13u3
Debian:14	inetutils	before 2:2.7-4	2:2.7-4
openSUSE:Leap 16.0	krb5-appl	before 1.0.3-bp160.2.1	1.0.3-bp160.2.1
openSUSE:Tumbleweed	krb5-appl	before 1.0.3-6.1	1.0.3-6.1
SUSE:Linux Enterprise Server 12 SP5-LTSS	krb5-appl	before 1.0.3-3.12.1	1.0.3-3.12.1

Same product

gnu: all records

Other highest-scoring records for the same primary product.

CVE-2026-24061telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.KEV
99Now
CVE-2026-28372telnetd in GNU inetutils through 2.7 allows privilege escalation that can be exploited by abusing systemd service credentials support added
31Monitor
CVE-2023-40303GNU inetutils before 2.5 may allow privilege escalation because of unchecked return values of set*id() family functions in ftpd, rcp, rlogin
31Monitor

Published before and after this one in the same product

← EarlierCVE-2021-40491Sep 2, 2021 · The ftp client in GNU Inetutils before 2.2 does not validate addresses returned by PASV/LSPV responses to make sure they match the server ad
26Monitor
← EarlierCVE-2022-39028Aug 30, 2022 · telnetd in GNU Inetutils through 2.3, MIT krb5-appl through 1.0.3, and derivative works has a NULL pointer dereference via 0xff 0xf7 or 0xff
31Monitor
Later →CVE-2026-32772Mar 16, 2026 · telnet in GNU inetutils through 2.7 allows servers to read arbitrary environment variables from clients via NEW_ENVIRON SEND USERVAR.
18Monitor

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:inetutils-telnet	2.8-r0 · Alpine:v3.24	Package registry (OSV)
debian:inetutils	2:2.4-2+deb12u3 · Debian:12	Package registry (OSV)
opensuse:krb5-appl	1.0.3-6.1 · openSUSE:Tumbleweed	Package registry (OSV)
suse:krb5-appl	1.0.3-3.12.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS	Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

Exploit-DB entry ×1
Proof-of-concept repository on GitHub ×7

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Exploit-DB entry	remote	2026-05-07
Proof-of-concept repository on GitHub	stars:30	2026-03-18
Proof-of-concept repository on GitHub	stars:0	2026-03-19
Proof-of-concept repository on GitHub	stars:10	2026-03-19
Proof-of-concept repository on GitHub	stars:0	2026-03-20
Proof-of-concept repository on GitHub	stars:0	2026-03-20
Proof-of-concept repository on GitHub	stars:0	2026-05-09
Proof-of-concept repository on GitHub	stars:2	2026-08-02

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.

PublishedMar 13, 2026
First PoCMar 18, 2026+4 d
TodayNov 5, 2026+237 d

EPSS, last 120 days+1% in 7 days

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 researchers

Finders, 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0323 · Jun 5, 2026(GNU Inetutils telnetd Güvenlik Zafiyeti)

All national notices →

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: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

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✗ → ✓Sep 28, 2026, 10:46 PM UTC

For records you follow, these changes also arrive as notifications. →

References

www.openwall.com/lists/oss-security/2026/03/12/4

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

What does it mean in your environment?

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Data sources and verification

CNA: mitre

CVE.org (CNA)Mar 23, 2026, 1:13 PM UTC
CISA ADPMar 23, 2026, 1:13 PM UTC
NVDJun 17, 2026, 6:36 AM UTC
FIRST EPSSNov 4, 2026, 12:00 AM UTC
OSV / GHSANov 5, 2026, 3:18 AM UTC
Exploit-DBNov 5, 2026, 3:17 AM UTC
PoC-in-GitHubNov 5, 2026, 3:18 AM UTC

Each line is when that source was last processed for this record.