CVE-2018-1000005
In your normal cycle
Critical by CVSS (9.1), but no sign of active exploitation.
Description
libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.
Scoring
| CVSS | 9.1 (CRITICAL, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| EPSS | 4.56% — more likely to be exploited than 91% of all CVEs |
| Weakness | CWE-125 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2018-01-24 |
| Last modified | 2026-06-17 |
Affected (3)
| Vendor | Product |
|---|---|
| canonical | ubuntu linux |
| debian | debian linux |
| haxx | libcurl |
References
- http://www.securitytracker.com/id/1040273
- https://access.redhat.com/errata/RHSA-2019:1543
- https://curl.haxx.se/docs/adv_2018-824a.html
- https://github.com/curl/curl/pull/2231
- https://usn.ubuntu.com/3554-1/
- https://www.debian.org/security/2018/dsa-4098
- http://www.securitytracker.com/id/1040273
- https://access.redhat.com/errata/RHSA-2019:1543
- https://curl.haxx.se/docs/adv_2018-824a.html
- https://github.com/curl/curl/pull/2231
- https://usn.ubuntu.com/3554-1/
- https://www.debian.org/security/2018/dsa-4098
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