CVE-2016-9594: haxx curl Improper Initialization
Vulnerability summary
CVE-2016-9594 is a high (CVSS 8.1) Improper Initialization vulnerability in haxx curl. EPSS estimates a 2.22% chance of exploitation in the next 30 days, higher than 82.6% of scored vulnerabilities.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 23-04-2018PublishedVulnerability first disclosed.
- 15-04-2026Last modifiedVulnerability information updated.
Description
curl before version 7.52.1 is vulnerable to an uninitialized random in libcurl's internal function that returns a good 32bit random value. Having a weak or virtually non-existent random value makes the operations that use it vulnerable.
CVSS metrics
4 scores · 3 sources · 2 versions- CVE.orgCNA6.5MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NDiffers
- OSV · AlpineEcosystem advisory · calculated8.1HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
2.22%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.22% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- curl< 7.52.1-r0 | < 7.52.1
Haxx1 product
- curl< 7.52.1
Unspecified1 product
- curlcurl 7.52.1
3 vendors · 3 products