How severe is GHSA-9q78-27f3-2jmh?

No CVSS score has been assigned to GHSA-9q78-27f3-2jmh yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-9q78-27f3-2jmh?

GHSA-9q78-27f3-2jmh affects the following packages: webp (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-9q78-27f3-2jmh?

Update webp to 0.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9q78-27f3-2jmh is resolved across your whole dependency graph.

How do I detect GHSA-9q78-27f3-2jmh in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for webp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-9q78-27f3-2jmh if there is no patch (or I can't update yet)?

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.

Is GHSA-9q78-27f3-2jmh actively exploited in the wild?

No public exploit code has been indexed for GHSA-9q78-27f3-2jmh yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-9q78-27f3-2jmh published, and has it been updated?

GHSA-9q78-27f3-2jmh was published on August 29, 2025 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🦀 crates.io

Not in CISA KEV

webp crate may expose memory contents when encoding an imageGHSA-9q78-27f3-2jmh

Fix: jaredforth/webp#44

GHSA-9q78-27f3-2jmh is a security vulnerability in webp. A fix is available for webp — see the affected versions and patch details below.

Also known asRUSTSEC-2024-0443

Published

Aug 29, 2025

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀webp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Affected versions of this crate did not check that the input slice passed to "webp::Encoder::encode() is large enough for the specified image dimensions.

If the input slice is too short, the library will read out of bounds of the buffer and encode other memory contents as an image, resulting in memory exposure or a segmentation fault.

The flaw was corrected in pull request #44 by always validating the input buffer size when constructing the encoder.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`webp`	all versions	0.3.1`cargo update -p webp --precise 0.3.1`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for webp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update webp to 0.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9q78-27f3-2jmh 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.

Frequently Asked Questions

Affected versions of this crate did not check that the input slice passed to `"webp::Encoder::encode()` is large enough for the specified image dimensions. If the input slice is too short, the library will read out of bounds of the buffer and encode other memory contents as an image, resulting in memory exposure or a segmentation fault. The flaw was corrected in [pull request #44](https://github.com/jaredforth/webp/pull/44) by always validating the input buffer size when constructing the encoder.

O3 Security · Impact-Aware SCA

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