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CVE-2026-62298low0.0

asn1c: ASAN crash with decode of open types

Impact

The asn1c compiler, versions prior to 1.2.5, has a NULL pointer dereference weakness in OPEN TYPE decoding, which can cause a program crash. The issue occurs when the OPEN TYPE member has not been allocated. The vulnerability affects versions less than 1.2.5.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

mouse07410 · GitHub_M

asn1c

1 range
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

< 1.2.5

unaffected

unknown

Other versions: unknown

Original source description

mouse07410/asn1c is an ASN.1 compiler. Prior to 1.2.5, OPEN TYPE decoding can dereference an unallocated member pointer and crash the consuming program. OPEN_TYPE_aper_get in OPEN_TYPE_aper.c, OPEN_TYPE_ber_get in OPEN_TYPE_ber.c, OPEN_TYPE_oer_get in OPEN_TYPE_oer.c, and OPEN_TYPE_uper_get in OPEN_TYPE_uper.c share the pattern: a conditional null check on *memb_ptr2 resets presence only when the member exists, but execution then unconditionally computes an inner value from that pointer and a member offset. If the OPEN TYPE member has not been allocated, the null-pointer arithmetic and subsequent read cause a segmentation fault. The advisory demonstrates UPER and APER crashes for E2connectionUpdateAcknowledge, notes that E2AP uses APER, and provides a BER reproducer; OER is also explicitly identified as affected. This issue is fixed in version 1.2.5.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-62298

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-476 ↗

CWE-476: NULL Pointer Dereference

GitHub_M

Related →
Contributing organizations · 2
GitHub_M

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-10-30

What changed

Follow changes
  1. CVE · CVE-2026-62298

    Observed 2026-10-30T22:23:23.709Z · upstream updated 2026-10-30T22:15:29.845Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-30T21:18:14.628986Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

4 sources
github.com/mouse07410/asn1c/security/advisories/GHSA-rcj5-gcvg-x796
Security advisoryGitHub_M
github.com/mouse07410/asn1c/commit/3f7d3bbac8cd195d552945e79586ca5000f33280
PatchGitHub_M
github.com/mouse07410/asn1c/commit/71ae41bd1cb146a432a39f72010b48f45ad69463
PatchGitHub_M
github.com/mouse07410/asn1c/releases/tag/v1.2.5
Release notesGitHub_M