curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers
curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers to bypass intended restrictions by resuming a session.
- Published
- Aug 10, 2016
- Updated
- Jun 16, 2026
- EPSS
- 15.1% · 97th percentile
- CWE
- CWE-310
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Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 5 / 30 · 15.1%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| haxx | libcurl | cpe:2.3:a:haxx:libcurl |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux8.0
- haxx libcurlup to 7.50.0 inclusive
- opensuse leap42.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | curl | before 7.50.1-r0 | 7.50.1-r0 |
| Alpine:v3.11 | curl | before 7.50.1 | 7.50.1 |
| Alpine:v3.2 | curl | before 7.49.1-r1 | 7.49.1-r1 |
| Debian:12 | curl | before 7.50.1-1 | 7.50.1-1 |
| Debian:7 | curl | before 7.26.0-1+wheezy14 | 7.26.0-1+wheezy14 |
| Debian:8 | curl | before 7.38.0-4+deb8u4 | 7.38.0-4+deb8u4 |
| Red Hat:enterprise_linux:7::client | curl | before 0:7.29.0-35.el7 | 0:7.29.0-35.el7 |
| Red Hat:enterprise_linux:7::client | curl-debuginfo | before 0:7.29.0-35.el7 | 0:7.29.0-35.el7 |
| Red Hat:enterprise_linux:7::client | libcurl | before 0:7.29.0-35.el7 | 0:7.29.0-35.el7 |
| Red Hat:enterprise_linux:7::client | libcurl-devel | before 0:7.29.0-35.el7 | 0:7.29.0-35.el7 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-curl | before 0:7.61.1-1.el6 | 0:7.61.1-1.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-curl-debuginfo | before 0:7.61.1-1.el6 | 0:7.61.1-1.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-httpd | before 0:2.4.34-7.el6 | 0:2.4.34-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-httpd-debuginfo | before 0:2.4.34-7.el6 | 0:2.4.34-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-httpd-devel | before 0:2.4.34-7.el6 | 0:2.4.34-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-httpd-manual | before 0:2.4.34-7.el6 | 0:2.4.34-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-httpd-tools | before 0:2.4.34-7.el6 | 0:2.4.34-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-libcurl | before 0:7.61.1-1.el6 | 0:7.61.1-1.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-libcurl-devel | before 0:7.61.1-1.el6 | 0:7.61.1-1.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-libnghttp2 | before 0:1.7.1-7.el6 | 0:1.7.1-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-libnghttp2-devel | before 0:1.7.1-7.el6 | 0:1.7.1-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-mod_ldap | before 0:2.4.34-7.el6 | 0:2.4.34-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-mod_proxy_html | before 1:2.4.34-7.el6 | 1:2.4.34-7.el6 |
| Red Hat:rhel_software_collections:3::el6 | httpd24-mod_session | before 0:2.4.34-7.el6 | 0:2.4.34-7.el6 |
+25
Same product
haxx: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-38545This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy
handshake.63This week
- CVE-2019-5436A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.46Plan
- CVE-2019-3822libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow.43Plan
- CVE-2018-14618curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code.42Plan
- CVE-2016-8622The URL percent-encoding decode function in libcurl before 7.51.0 is called `curl_easy_unescape`.40Plan
- CVE-2021-22945When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed38Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:curl | 7.50.1-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:curl | 7.50.1-1 · Debian:12 | Package registry (OSV) |
| red hat:curl | 0:7.29.0-35.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:curl-debuginfo | 0:7.29.0-35.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:httpd24-curl | 0:7.61.1-1.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:httpd24-curl-debuginfo | 0:7.61.1-1.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:httpd24-httpd | 0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:httpd24-httpd-debuginfo | 0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:httpd24-httpd-devel | 0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:httpd24-httpd-manual | 0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:httpd24-httpd-tools | 0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:httpd24-libcurl | 0:7.61.1-1.el6 · Red Hat:rhel_software_collections:3::el6 | Package registry (OSV) |
| red hat:libcurl | 0:7.29.0-35.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:libcurl-devel | 0:7.29.0-35.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:curl | 7.19.7-1.20.42.1 · SUSE:Studio Onsite 1.3 | Package registry (OSV) |
| suse:curl-openssl1 | 7.19.7-1.61.1 · SUSE:Linux Enterprise Server 11-SECURITY | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-310 · Cryptographic IssuesCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-updates/2016-09/msg00011.html
- lists.opensuse.org/opensuse-updates/2016-09/msg00094.html
- rhn.redhat.com/errata/RHSA-2016-2575.html
- rhn.redhat.com/errata/RHSA-2016-2957.html
- www.debian.org/security/2016/dsa-3638
- www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- www.securityfocus.com/bid/92292
- www.securityfocus.com/bid/92319
- www.securitytracker.com/id/1036538
- www.securitytracker.com/id/1038341
- www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.563059
- www.ubuntu.com/usn/USN-3048-1
- access.redhat.com/errata/RHSA-2018:3558
- curl.haxx.se/docs/adv_20160803A.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLPXQQKURBQFM4XM6645VRPTOE2AWG33/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3GQH4V3XAQ5Z53AMQRDEC3C3UHTW7QR/
- security.gentoo.org/glsa/201701-47
- source.android.com/security/bulletin/2016-12-01.html
- www.tenable.com/security/tns-2016-18
Vendor advisories and official records. Exploit/PoC links are deliberately left out.