AIKIDO-2026-740956
erlang is vulnerable to Denial of Service (DoS)
82
High Risk
This Affects:
erlangTL;DR
asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3, and asn1rtt_jer:json2oid/1 accumulate a base-128 OBJECT IDENTIFIER subidentifier into an unbounded integer with (Av bsl 7) + H per continuation byte. Each shift and addition is linear in the bits already accumulated, so one oversized arc is quadratic CPU work. That decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY reached from public_key:pkix_decode_cert/2 before signature verification, so a crafted peer certificate during a TLS handshake with verify_peer can stall the process. The fix bounds OID arc decoding so a large subidentifier cannot consume superlinear CPU.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you decode untrusted ASN.1 OBJECT IDENTIFIERs, including TLS with the verify_peer option.
Background info
erlang is vulnerable to Denial of Service (DoS) in versions 17.0.0 - 27.3.4.17, 28.0.0 - 28.5.0.6 and 29.0.0 - 29.1.
How to fix this
Upgrade the erlang library to the patch version.
Links
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