How severe is GHSA-xw57-23p8-9wc5?

No CVSS score has been assigned to GHSA-xw57-23p8-9wc5 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-xw57-23p8-9wc5?

GHSA-xw57-23p8-9wc5 affects the following packages: @asymmetric-effort/specifyjs (npm). Ecosystems affected: npm.

How do I fix GHSA-xw57-23p8-9wc5?

Update @asymmetric-effort/specifyjs to 0.2.136 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xw57-23p8-9wc5 is resolved across your whole dependency graph.

How do I detect GHSA-xw57-23p8-9wc5 in my npm dependencies?

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

How do I mitigate GHSA-xw57-23p8-9wc5 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-xw57-23p8-9wc5 actively exploited in the wild?

No public exploit code has been indexed for GHSA-xw57-23p8-9wc5 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-xw57-23p8-9wc5 published, and has it been updated?

GHSA-xw57-23p8-9wc5 was published on July 2, 2026 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.

📦 npm

Not in CISA KEV

@asymmetric-effort/specifyjs: Localhost bypass incomplete (IPv6, 0.0.0.0, 127.x range)GHSA-xw57-23p8-9wc5

Fix: asymmetric-effort/specifyjs@25d1fb4

GHSA-xw57-23p8-9wc5 is a security vulnerability in @asymmetric-effort/specifyjs. A fix is available for @asymmetric-effort/specifyjs — see the affected versions and patch details below.

Published

Jul 2, 2026

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

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

@asymmetric-effort/specifyjsnpm

463downloads / week

Description

Finding

Location: core/src/shared/secure-fetch.ts:52-54

The localhost exception allowed localhost and 127.0.0.1 but did not cover 0.0.0.0, [::1] (IPv6 localhost), or the full 127.0.0.0/8 loopback range.

Status

Fixed in v0.2.136 — Localhost detection now covers localhost, 127.0.0.1, [::1], 0.0.0.0, and the full 127.x.x.x range.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`@asymmetric-effort/specifyjs`	all versions	0.2.136`npm install @asymmetric-effort/specifyjs@0.2.136`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @asymmetric-effort/specifyjs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @asymmetric-effort/specifyjs to 0.2.136 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xw57-23p8-9wc5 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

## Finding **Location**: `core/src/shared/secure-fetch.ts:52-54` The localhost exception allowed `localhost` and `127.0.0.1` but did not cover `0.0.0.0`, `[::1]` (IPv6 localhost), or the full `127.0.0.0/8` loopback range. ## Status **Fixed in v0.2.136** — Localhost detection now covers `localhost`, `127.0.0.1`, `[::1]`, `0.0.0.0`, and the full `127.x.x.x` range.

O3 Security · Impact-Aware SCA

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