5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-45676

CVE-2026-45676: OpenTelemetry eBPF Instrumentation: Unsafe fastelf parsing allows malformed ELF to crash agent

OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, OBI's replacement ELF parser trusts section offsets, counts, and string offsets from the executable file. A crafted local ELF can make OBI dereference invalid section pointers or slice past string tables, causing the agent to panic while determining the process language. This issue has been patched in version 0.9.0.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-45676

CVE-2026-45676:

5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation pocAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
go.opentelemetry.io/obi	go	< 0.9.0	0.9.0

Technical Details

Vulnerability Intelligence
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Root Cause Analysis

The vulnerability lies in the unsafe parsing of ELF files by the OpenTelemetry eBPF Instrumentation agent. The analysis of the security advisory and the associated patch commit reveals that several functions in the fastelf and procs packages did not properly validate data read from ELF files. Specifically, functions like GetCStringUnsafe and ReadStruct were susceptible to out-of-bounds memory access when handling crafted offsets and sizes from a malicious ELF file, leading to a panic. The matchExeSymbols function, which uses these unsafe functions, was also vulnerable to a division-by-zero error. The findLanguageFromElf function, which orchestrates the ELF parsing, was patched to include a panic recovery mechanism, confirming it as the location where the agent crash would manifest. The identified vulnerable functions are the ones that were directly involved in the unsafe data handling and were subsequently patched to include necessary validation and error handling.

Vulnerable functions

fastelf.GetCStringUnsafe

pkg/internal/fastelf/fastelf.go

The function performed unsafe slicing on `strtab` using an offset from a malformed ELF file without proper validation. This could lead to a panic due to an out-of-bounds slice. The patch added a check to ensure the offset is within the bounds of the slice.

fastelf.ReadStruct

pkg/internal/fastelf/fastelf.go

The function performed unsafe pointer conversion from a byte slice at a given offset without sufficiently validating the offset. A negative offset or an offset close to the end of the slice could cause a panic. The patch introduced more robust checks to prevent out-of-bounds access.

procs.matchExeSymbols

pkg/internal/procs/proclang_linux.go

This function processes symbol tables from an ELF file. It was vulnerable to a division-by-zero panic if `sec.Entsize` from a malformed ELF was zero. The patch added a check to prevent this division. This function also calls the vulnerable `ReadStruct` and `GetCStringUnsafe` functions.

procs.findLanguageFromElf

pkg/internal/procs/proclang_linux.go

This function is a higher-level function that orchestrates the parsing of an ELF file to determine the programming language. It calls other vulnerable functions like `matchExeSymbols`. A panic in any of the downstream functions would crash the agent. The patch added a `recover` block to catch such panics and prevent the agent from crashing, indicating this is a key function in the exploit path.

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Reasoning

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