Skip to content
Noroxi
NVD / CVE Program· CNA GitHub_M

CVE-2025-26618: SSH SFTP packet size not verified properly in Erlang OTP

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.49% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: azl3 erlang 26.2.5.6-1 on Azure Linux 3.0 26.2.5.9-1; azl3 erlang 26.2.5.9-1 on Azure Linux 3.0 26.2.5.9-1; cbl2 erlang 25.2-3 on CBL Mariner 2.0 25.2-3.

Low priority for now. Upgrade to azl3 erlang 26.2.5.6-1 on Azure Linux 3.0 26.2.5.9-1; azl3 erlang 26.2.5.9-1 on Azure Linux 3.0 26.2.5.9-1; cbl2 erlang 25.2-3 on CBL Mariner 2.0 25.2-3 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

Erlang is a programming language and runtime system for building massively scalable soft real-time systems with requirements on high availability. OTP is a set of Erlang libraries, which consists of the Erlang runtime system, a number of ready-to-use components mainly written in Erlang. Packet size is not verified properly for SFTP packets. As a result when multiple SSH packets (conforming to max SSH packet size) are received by ssh, they might be combined into an SFTP packet which will exceed the max allowed packet size and potentially cause large amount of memory to be allocated. Note that situation described above can only happen for successfully authenticated users after completing the SSH handshake. This issue has been patched in OTP versions 27.2.4, 26.2.5.9, and 25.3.2.18. There are no known workarounds for this vulnerability.

HighCVSS 7.0 · v4.0—No exploit Fix available
Published
Feb 20, 2025
Updated
Jun 17, 2026
EPSS
0.4% · 43th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.0
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.

Follow CVE-2025-26618

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for erlang records
Is your version affected? Check it

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 help

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.

—

Versions reported by the vendor

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

  • erlang otp

    • >= OTP-27.0.0, < OTP-27.2.4, >= OTP-26.0.0.0, < OTP-26.2.5.9, < OTP-25.3.2.18affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:11erlangbefore 1:23.2.6+dfsg-1+deb11u21:23.2.6+dfsg-1+deb11u2
Debian:12erlangbefore 1:25.2.3+dfsg-1+deb12u11:25.2.3+dfsg-1+deb12u1
Debian:13erlangbefore 1:27.2.4+dfsg-11:27.2.4+dfsg-1
openSUSE:Leap 15.6erlangbefore 23.3.4.19-150300.3.17.123.3.4.19-150300.3.17.1
openSUSE:Leap 15.6erlang26before 26.2.1-150300.7.8.126.2.1-150300.7.8.1
openSUSE:Tumbleweederlangbefore 27.2.4-2.127.2.4-2.1
openSUSE:Tumbleweederlang27before 27.1.3-3.127.1.3-3.1
SUSE:Linux Enterprise Module for Server Applications 15 SP6erlangbefore 23.3.4.19-150300.3.17.123.3.4.19-150300.3.17.1
SUSE:Linux Enterprise Module for Server Applications 15 SP6erlang26before 26.2.1-150300.7.8.126.2.1-150300.7.8.1

Same product

erlang: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-89422TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension
    37Monitor
  • CVE-2026-74835inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception
    34Monitor
  • CVE-2026-71380httpd applies no timeout while receiving a request body, parking a worker on a stalled client
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2024-53846Dec 5, 2024 · ssl fails to validate incorrect extened key usage
    22Monitor
  • Later →CVE-2025-30211Mar 28, 2025 · KEX init error results with excessive memory usage
    30Monitor
  • Later →CVE-2025-46712May 8, 2025 · Erlang/OTP SSH Has Strict KEX Violations
    14Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 erlang 26.2.5.6-1 on Azure Linux 3.026.2.5.9-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 erlang 26.2.5.9-1 on Azure Linux 3.026.2.5.9-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 erlang 25.2-3 on CBL Mariner 2.025.2-3 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 erlang 25.2-3 on CBL-Mariner 2.025.2-3 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:erlang1:25.2.3+dfsg-1+deb12u1 · Debian:12Package registry (OSV)
opensuse:erlang23.3.4.19-150300.3.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:erlang2626.2.1-150300.7.8.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:erlang2727.1.3-3.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:erlang23.3.4.19-150300.3.17.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP6Package registry (OSV)
suse:erlang2626.2.1-150300.7.8.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP6Package 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.

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 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.

  • CVE-2025-3021136 days apartKEX init error results with excessive memory usage
    30Monitor

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.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-789 · Memory Allocation with Excessive Size Value

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (3 more)

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

All records