CVE-2026-45615 mouse07410/asn1c: 1-byte Heap Out-of-Bounds Read in `INTEGER_decode_oer` via Malformed OER Payload
Remote attackers can cause denial of service or logic errors via a heap out-of-bounds read in asn1c-generated code when parsing malformed OER payloads.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45615?
CVE-2026-45615 is a high-severity memory corruption vulnerability in mouse07410 asn1c, published on 29 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
mouse07410/asn1c is an ASN.1 compiler. In 1.4 and earlier, a memory safety vulnerability was identified in the OER decoding skeleton files generated by asn1c (specifically INTEGER_oer.c). When parsing a maliciously crafted, zero-length OER payload for a variable-length, non-negative INTEGER type, the decoder fails to validate the required bytes before extracting the Most Significant Bit (MSB). This forces a precise 1-byte Heap Out-of-Bounds (OOB) Read. Because asn1c generated code is primarily deployed to parse untrusted network inputs (such as V2X network protocols, 5G telecom headers, or X.509 certificates), when the decoder processes untrusted network-originated input, a remote attacker can exploit this to cause a Denial of Service (DoS) or trigger incorrect integer interpretation in downstream applications (e.g., protocol state poisoning or logic bypass).
Which versions are affected by CVE-2026-45615?
How do I fix CVE-2026-45615?
No fix has been published for CVE-2026-45615 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-45615 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45615 exists.
Sources
Also known as GHSA-wxx8-76rw-96j2.