CVE-2025-66564CWE-405

CVE-2025-66564

High · published December 5, 2025

CVSS v3.1
7.5
EPSS
0%
Percentile
37.5
In the wild
Unconfirmed
What it is

⚡ A crafty exploit can cause excessive memory allocation with a maliciously crafted request! If an attacker sends a sneaky payload with a long string of periods, they could slow down your service drastically. 🔥 Think of it like a restaurant handling an overflow of orders. If the chef receives an order with an absurdly long list of modifications, it can lead to chaos in the kitchen, causing delays and frustration for everyone waiting. In this case, untrusted input is leading to an overcooked situation! An attacker could exploit this by flooding the server with requests that contain excessively long OID or malformed Content-Type headers, causing memory to spike and potentially crashing the service or causing a significant performance degradation. Just imagine your service taking a leisurely stroll while your users expect it to sprint!

Put simply

Think of it like a restaurant handling an overflow of orders. If the chef receives an order with an absurdly long list of modifications, it can lead to chaos in the kitchen, causing delays and frustration for everyone waiting. In this case, untrusted input is leading to an overcooked situation! This vulnerability in Sigstore Timestamp Authority affects versions prior to 2.0.3, where untrusted data is improperly handled by functions api.ParseJSONRequest and api.getContentType, leading to inefficient memory allocation based on the length of the input provided.

What to do

An attacker could exploit this by flooding the server with requests that contain excessively long OID or malformed Content-Type headers, causing memory to spike and potentially crashing the service or causing a significant performance degradation. Just imagine your service taking a leisurely stroll while your users expect it to sprint! To mitigate this vulnerability, upgrade to Sigstore Timestamp Authority version 2.0.3 or later. Additionally, consider setting limits on the length of inputs to prevent excessive memory allocations in future requests. Regularly audit your application for similar vulnerabilities to enhance security. You've got this! Just follow these steps, and you'll have your service running smoothly in no time. 🛡️

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00443 · 37.5th percentile
Weakness
CWE-405 · Asymmetric Resource Consumption (Amplification)
Published
2025-12-05T04:15Z
Affected products (1)
ProductVersionsFixed in
linuxfoundation/sigstore_timestamp_authority< 2.0.32.0.3
References (2)
EPSS history
Timeline
  • 04 DEC 22:37Z
    Sigstore Timestamp Authority allocates excessive memory during request parsing
    cvelistv5