CVE-2026-21620 · published 2026-02-20 · updated 2026-07-24

TFTP Path Traversal

LOW 2.3 CWE-23 · Relative Path Traversal
OSV.dev JSON

Am I affected?

This record states its affected versions in a form that can't be compared automatically.

≥ 17.0 and up affected
→ 26.2.5.17 not affected
→ 27.3.4.8 not affected
→ 28.3.2 not affected
every other version: unaffected

Description

Relative Path Traversal, Improper Isolation or Compartmentalization vulnerability in erlang otp erlang/otp (tftp_file modules), erlang otp inets (tftp_file modules), erlang otp tftp (tftp_file modules) allows Relative Path Traversal.

This vulnerability is associated with program files lib/tftp/src/tftp_file.erl, src/tftp_file.erl.

This issue affects OTP from OTP 17.0 before OTP 28.3.2, OTP 27.3.4.8 and OTP 26.2.5.17, corresponding to tftp from 1.0 before 1.2.4, 1.2.2.1 and 1.1.1.1; also inets from 5.10 before 7.0.

Weaknesses & attack patterns

Weakness

CWE-23 · Relative Path Traversal in catalog → MITRE ↗

Attack patterns

CAPEC-139 · Relative Path Traversal MITRE ↗

Affected — GitHub / erlang/otp Repository ↗

≥ 17.0 and up affected
→ 26.2.5.17 not affected
→ 27.3.4.8 not affected
→ 28.3.2 not affected
≥ 07b8f44 and up affected
→ 655fb95 not affected
→ 3970738 not affected
→ 696fdec not affected
every other version: unaffected
default status unaffected
cpe cpe:2.3:a:erlang:erlang/otp:*:*:*:*:*:*:*:*
modules · source files
modules tftp_file
source files lib/tftp/src/tftp_file.erl

Affected — Erlang / inets Repository ↗

≥ 5.10 < 7.0 affected
every other version: unaffected
default status unaffected
modules · source files
modules tftp_file
source files src/tftp_file.erl

Affected — Erlang / tftp Repository ↗

≥ 1.0 and up affected
→ 1.1.1.1 not affected
→ 1.2.2.1 not affected
→ 1.2.4 not affected
every other version: unaffected
default status unaffected
modules · source files
modules tftp_file
source files src/tftp_file.erl

Configurations

A TFTP server must be started and the TFTP port must be reachable by the attacker, using the tftp application (or the legacy inets TFTP service) with the tftp_file callback module configured with the {root_dir, Dir} option.

References

github.com/erlang/otp · GHSA-hmrc-prh3-rpvp ↗ vendor-advisory
https://github.com/erlang/otp/pull/10706 patch
github.com/erlang/otp · 696fdec ↗ patch
github.com/erlang/otp · 3970738 ↗ patch
github.com/erlang/otp · 655fb95 ↗ patch
osv.dev · EEF-CVE-2026-21620 ↗ related

Credits

Luigino Camastra / Aisle Research Finder
Jakub Witczak Remediation reviewer
Raimo Niskanen Remediation developer

CVSS breakdown

LOW 2.3 open in calculator →
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
« All CVEs