CVE-2026-70409
Publication date 1 September 2026
Last updated 28 September 2026
Ubuntu priority
Description
Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP eldap allows a malicious or compromised LDAP server to degrade availability by returning a referral URL whose port component is a very long run of digits. eldap:parse_port/2 passes the port substring straight to list_to_integer/1 with no length bound. The surrounding try ... catch only rejects a value that fails to parse, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the caller hundreds of milliseconds of arbitrary-precision arithmetic per referral. The conversion function itself is documented to accept integers of any size, so bounding the input is the caller's responsibility. Reaching the flaw requires the application to pass a server-supplied referral to eldap:parse_ldap_url/1, which eldap never calls itself: referral strings are returned to the caller unparsed. This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to eldap from 1.0.3 before 1.2.14.2, from 1.2.15 before 1.2.16.1, and from 1.3 before 1.3.1.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| erlang | 26.04 LTS resolute |
Fixed 1:27.3.4.6+dfsg-1ubuntu0.1
|
| 24.04 LTS noble |
Fixed 1:25.3.2.8+dfsg-1ubuntu4.7
|
|
| 22.04 LTS jammy |
Fixed 1:24.2.1+dfsg-1ubuntu0.7
|
|
| 20.04 LTS focal |
Fixed 1:22.2.7+dfsg-1ubuntu0.5+esm2
|
|
| 18.04 LTS bionic |
Fixed 1:20.2.2+dfsg-1ubuntu2+esm3
|
|
| 16.04 LTS xenial |
Fixed 1:18.3-dfsg-1ubuntu3.1+esm3
|
|
| 14.04 LTS trusty |
Fixed 1:16.b.3-dfsg-1ubuntu2.2+esm2
|
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CVSS version: CVSS v4.0
Base score
6.3 · Medium
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-70409
- https://github.com/erlang/otp/security/advisories/GHSA-9vgh-c8cm-m9p4
- https://cna.erlef.org/cves/CVE-2026-70409.html
- https://osv.dev/vulnerability/EEF-CVE-2026-70409
- https://github.com/erlang/otp/commit/aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d
- https://github.com/erlang/otp/commit/e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa
- https://www.erlang.org/doc/system/versions.html#order-of-versions