CVE-2026-55737 (GCVE-0-2026-55737)

Vulnerability from cvelistv5 – Published: 2026-07-27 15:13 – Updated: 2026-07-28 09:55
VLAI
Title
Heap pointer corruption via signed/unsigned mismatch in LARGE_TUPLE_EXT decoding in erts external term format decoder
Summary
Signed to Unsigned Conversion Error and Out-of-bounds Write vulnerability in Erlang OTP erts allows an attacker who can supply a crafted Erlang external term format (ETF) binary to binary_to_term/1 to corrupt the BEAM heap pointer and crash the virtual machine. When decoding a LARGE_TUPLE_EXT term, the validation pass decoded_size() in erts/emulator/beam/external.c reads the 32-bit arity field as unsigned (get_uint32()), while the decode pass dec_term() reads the same field as a signed 32-bit integer (get_int32()) into an int. An arity wire value of 0x80000000 passes validation as 2147483648 but decodes as -2147483648, so the subsequent hp += n moves the heap allocation pointer backward. Neither pass enforces the runtime tuple-arity limit MAX_ARITYVAL. The result is an out-of-bounds heap write; in practice the VM detects an impossible heap size and aborts, denying service. The required padding is large when uncompressed but the compressed-ETF envelope shrinks it to a small payload on the wire. This issue affects OTP from OTP 25.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to erts from 13.0 before 17.0.4, 16.4.0.4 and 15.2.7.11.
Severity
5.1 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 18:34 UTC
CWE
  • CWE-195 - Signed to Unsigned Conversion Error
  • CWE-787 - Out-of-bounds Write
Assigner
EEF CNA under the mitre root
CNA scorecard A 97/100 over 344 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Erlang OTP Affected: 13.0 , < * (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 25.0 , < * (otp)
Affected: ebcbb97b4ec223464cac3d94375739a248ddef6e , < c5210b42a9d3d96f3d25601942ce8122be0f3761 (git)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Nick Gunn Kiko Fernandez-Reyes Sverker Eriksson
Show details on NVD website
To clipboard 

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}



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