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Low severity · published Feb 20, 2026
CVE-2026-21620
TFTP Path Traversal
2.3
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OT
OTP · Erlang
17.0; 07b8f441ca711f9812fad9e9115bab3c3aa92f79; 5.10 before 7.0; 1.0 · source: vendor
Affected product
OT
OTP
Erlang
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21620
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21620
cna.erlef.org
https://cna.erlef.org/cves/CVE-2026-21620.html
github.com
https://github.com/erlang/otp/commit/3970738f687325138eb75f798054fa8960ac354e
github.com
https://github.com/erlang/otp/commit/655fb95725ba2fb811740b57e106873833824344
github.com
https://github.com/erlang/otp/commit/696fdec922661d4a3cc528fc34bc24fae8d4ad8a
github.com
https://github.com/erlang/otp/pull/10706
github.com
https://github.com/erlang/otp/security/advisories/GHSA-hmrc-prh3-rpvp
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