CVE-2026-55737: Heap pointer corruption via signed/unsigned mismatch in LARGE_TUPLE_EXT decoding in erts external term format decoder
CSIRTS triage
- What
- Heap pointer corruption occurs in the LARGE_TUPLE_EXT decoder due to signed/unsigned mismatch in the external term format parser.
- Who is affected
- Erlang/OTP systems processing untrusted LARGE_TUPLE_EXT messages.
- Urgency
- Unknown severity but memory corruption can lead to code execution; should be treated as urgent.
- Action
- Update to patched Erlang/OTP version that fixes the signed/unsigned type handling in tuple decoder.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55737
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-557370.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-55737 | coverage & exploitation status | NVD · CVE.org |
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