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Technology
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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| swift | pip | >= 1.4.6, <= 1.8.0 | |
| swift | pip | >= 1.9.0, <= 1.10.0 | |
| swift | pip | = 1.11.0 | 1.12.0 |
The vulnerability stems from insecure timing-sensitive string comparison in TempURL middleware. The commit 7546339 shows the fix replaced the vulnerable 'in' check with a constant-time comparison using 'streq_const_time'. The original code path in the call method performed a linear scan of hmac_vals with short-circuiting logic, making response times dependent on input similarity to valid signatures. This matches the CVE description of a timing side-channel attack against TempURL signatures.