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Fencer Vulns
critical 9.1

CVE-2018-1000005 json

libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers.

published 2018-01-24 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-1777

cvss
9.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.6%
EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

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.

Patch / fix

  • curl Debian 14, Debian 13, Debian 12 7.58.0-1

debian advisories DEBIAN-CVE-2018-1000005

  • curl Ubuntu 16.04 LTS 7.47.0-1ubuntu2.6

ubuntu advisories UBUNTU-CVE-2018-1000005

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl openSUSE Tumbleweed 7.79.1-1.1

opensuse advisories openSUSE-SU-2024:10582-1

  • curl Alpine 3.7, Alpine 3.6, Alpine 3.5 +1 more 7.58.0-r0

alpine advisories ALPINE-CVE-2018-1000005

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl Arch Linux 7.58.0-1
  • lib32-curl Arch Linux 7.58.0-1
  • libcurl-compat Arch Linux 7.58.0-1
  • libcurl-gnutls Arch Linux 7.58.0-1
  • lib32-libcurl-gnutls Arch Linux 7.58.0-1
  • lib32-libcurl-compat Arch Linux 7.58.0-1

arch linux advisories AVG-593AVG-594AVG-595AVG-596AVG-597AVG-598

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-1000005 updated cvss 4.8

curl: Out-of-bounds read in code handling HTTP/2 trailers

  • Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP2
    fixed: vendor fix RHSA-2019:1543
  • Red Hat .NET Core 1.0 on Red Hat Enterprise Linux rh-dotnetcore10-curl Red Hat .NET Core 1.1 on Red Hat Enterprise Linux rh-dotnetcore11-curl Red Hat .NET Core 2.0 on Red Hat Enterprise Linux rh-dotnet20-curl Red Hat Ceph Storage 2 curl, libcurl Red Hat Enterprise Linux 5 curl Red Hat Enterprise Linux 6 curl, libcurl
    +3 more products
    Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Linux 8 curl, libcurl, libcurl-minimal Red Hat Software Collections httpd24-curl, httpd24-libcurl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-19-155-01 updated cvss 9.1

PHOENIX CONTACT PLCNext AXC F 2152

  • Phoenix Contact AXC F 2152 2404267 version 1.x, 1046568 (Starterkit) version 1.x
    affected: vendor fix, mitigation “Phoenix Contact recommends affected users update to firmware release 2019.0 LTS or later, update to PLCNext Engineer release 2019.0 LTS or later, and apply the following specific mitigations below:” phoenixcontact.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

4.56% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.