GHSA-g3vv-g2j5-45f2 is a high-severity (CVSS 7.5) Buffer Overflow vulnerability in github.com/ipld/go-codec-dagpb. A fix is available for github.com/ipld/go-codec-dagpb — see the affected versions and patch details below.
ipld/go-codec-dagpb panics when processing certain blocks
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-g3vv-g2j5-45f2.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-g3vv-g2j5-45f2 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 376,715 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
github.com/ipld/go-codec-dagpbReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Impact
Decoding certain blocks using the go-ipld-prime version of the dag-pb codec (go-codec-dagpb) can cause a panic. The panic comes from an assumption that the reported link length is accurate, but if the block ends before that reported length then it’s a buffer overread.
Patches
The issue is fixed in v1.3.1 and above.
Consumers can discover the versions of go-codec-dagpb in a module's dependency graph using the following command in the module root:
go mod graph | grep go-codec-dagpb
Workarounds
You can work around this issue without upgrading by recovering panics higher in the call stack of the goroutine that calls the defective code.
For more information
If you have any questions or comments about this advisory:
- Ask in IPFS Discord #ipld-chatter
- Open an issue in go-codec-dagpb
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/ipld/go-codec-dagpb | all versions | 1.3.1go get github.com/ipld/go-codec-dagpb@v1.3.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/ipld/go-codec-dagpb, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/ipld/go-codec-dagpb to 1.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-g3vv-g2j5-45f2 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-g3vv-g2j5-45f2 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-g3vv-g2j5-45f2. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-g3vv-g2j5-45f2 in your dependencies?
O3 Security finds GHSA-g3vv-g2j5-45f2 across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.