CVE-2026-8286: wrong STARTTLS connection reuse
Modified
AliasesALPINE-CVE-2026-8286RHSA-2026:57462UBUNTU-CVE-2026-8286DEBIAN-CVE-2026-8286CGA-33wc-824f-7376CGA-3gmv-gppj-wj97CGA-4qf4-98mx-pvm8CGA-5qj9-8fqw-3hvvCGA-75w8-xfpq-3mh2CGA-7crc-5mq7-c4w2CGA-cxmh-4hf3-c982CGA-fqxq-3gq7-mxhgCGA-g2pr-972j-8632CGA-g382-xj54-qc2hCGA-gfvp-w4gh-w665CGA-hm2m-rgq3-83f4CGA-j7rw-w3pj-4r2gCGA-mxqj-76qp-xmg3CGA-pcph-c8m5-6cpjCGA-q3v4-vv67-rpchCGA-q567-66q9-pxqjCGA-rg5c-xf3w-3v56CGA-rw2q-6824-j5xcCGA-v8x2-w692-j97pCGA-wcxc-4pp7-wvp7
Published 03-07-2026Last modified 15-09-2026
Vulnerability summary
CVE-2026-8286 is a high (CVSS 8.1) Improper Certificate Validation vulnerability in curl. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 23.8% of scored vulnerabilities. 1 public exploit is recorded.
Priority
Prioritisepublic exploit
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?CVSS score
8.1/10
010
High · v3.1 (CVE.org)EPSS score
0.31%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 15 · Related 12OPENSUSE-SU-2026:11230-1OPENSUSE-SU-2026:21272-1RHSA-2026:29017RHSA-2026:34975RHSA-2026:55439RHSA-2026:55450RHSA-2026:72506SUSE-SU-2026:22553-1SUSE-SU-2026:22582-1SUSE-SU-2026:22709-1SUSE-SU-2026:22889-1SUSE-SU-2026:2925-1SUSE-SU-2026:2926-1SUSE-SU-2026:3043-1SUSE-SU-2026:3814-1CGA-M23J-58C5-RMCCUSN-8487-1
Timeline
- 03-07-2026PublishedVulnerability first disclosed.
- 15-09-2026Last modifiedVulnerability information updated.
Description
A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.
CVSS metrics
8 scores · 8 sources · 1 versionHigh 8.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NSourcesAll 8 agree
- OSV · AlpineEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- OSV · Red hatEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- OSV · WolfiEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- OSV · ChainguardEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- NVDNIST8.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS trend
Probability
0.31%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.31% on 04-10-2026
04-10-202603-11-2026
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
1 foundExploit Reference (hackerone.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Version check
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard11 products
- eco-python-curl< 8.21.0-r0
- eco-python-curl-minimal< 8.21.0-r0
- eco-python-curl-minimal-bin< 8.21.0-r0
- eco-python-curl-minimal-dev< 8.21.0-r0
- eco-python-curl-minimal-doc< 8.21.0-r0
Redhat9 products
- curl< 0:7.61.1-34.el8_10.13
- curl-debuginfo< 0:7.61.1-34.el8_10.13
- curl-debugsource< 0:7.61.1-34.el8_10.13
- curl-minimal-debuginfo< 0:7.61.1-34.el8_10.13
- libcurl< 0:7.61.1-34.el8_10.13
Alpine1 product
- curl≥ 7.30.0, < 8.14.1-r3 | ≥ 7.30.0, < 8.14.1-r4 | ≥ 7.30.0, < 8.22.0-r0 | ≥ 7.30.0, < 8.21.0-r0
Curl1 product
- curl≥ 7.30.0, < 8.14.2 | ≥ 8.15.0, < 8.16.1 | ≥ 8.17.0, < 8.20.1 | ≥ a1701eea289fe7ea80651f801cf992838a491dde, < a86efdd7ca5433de9231e650f18247de8319ad16 | 8.20.0 | 8.19.0 | 8.18.0 | 8.17.0 | 8.16.0 | 8.15.0 | 8.14.1 | 8.14.0 | 8.13.0 | 8.12.1 | 8.12.0 | 8.11.1 | 8.11.0 | 8.10.1 | 8.10.0 | 8.9.1 | 8.9.0 | 8.8.0 | 8.7.1 | 8.7.0 | 8.6.0 | 8.5.0 | 8.4.0 | 8.3.0 | 8.2.1 | 8.2.0 | 8.1.2 | 8.1.1 | 8.1.0 | 8.0.1 | 8.0.0 | 7.88.1 | 7.88.0 | 7.87.0 | 7.86.0 | 7.85.0 | 7.84.0 | 7.83.1 | 7.83.0 | 7.82.0 | 7.81.0 | 7.80.0 | 7.79.1 | 7.79.0 | 7.78.0 | 7.77.0 | 7.76.1 | 7.76.0 | 7.75.0 | 7.74.0 | 7.73.0 | 7.72.0 | 7.71.1 | 7.71.0 | 7.70.0 | 7.69.1 | 7.69.0 | 7.68.0 | 7.67.0 | 7.66.0 | 7.65.3 | 7.65.2 | 7.65.1 | 7.65.0 | 7.64.1 | 7.64.0 | 7.63.0 | 7.62.0 | 7.61.1 | 7.61.0 | 7.60.0 | 7.59.0 | 7.58.0 | 7.57.0 | 7.56.1 | 7.56.0 | 7.55.1 | 7.55.0 | 7.54.1 | 7.54.0 | 7.53.1 | 7.53.0 | 7.52.1 | 7.52.0 | 7.51.0 | 7.50.3 | 7.50.2 | 7.50.1 | 7.50.0 | 7.49.1 | 7.49.0 | 7.48.0 | 7.47.1 | 7.47.0 | 7.46.0 | 7.45.0 | 7.44.0 | 7.43.0 | 7.42.1 | 7.42.0 | 7.41.0 | 7.40.0 | 7.39.0 | 7.38.0 | 7.37.1 | 7.37.0 | 7.36.0 | 7.35.0 | 7.34.0 | 7.33.0 | 7.32.0 | 7.31.0 | 7.30.0
Debian1 product
- curlAll versions (No fix recorded) | < 8.14.1-2+deb13u7 | < 8.21.0~rc2-1
Haxx1 product
- curl≥ 7.30.0, < 8.21.0
Ubuntu1 product
- curl< 7.35.0-1ubuntu2.20+esm20 | < 7.47.0-1ubuntu2.19+esm16 | < 7.58.0-2ubuntu3.24+esm9 | < 7.68.0-1ubuntu2.25+esm4 | < 7.81.0-1ubuntu1.25 | < 8.5.0-2ubuntu10.10 | < 8.14.1-2ubuntu1.4 | < 8.18.0-1ubuntu2.2
Wolfi1 product
- libcurl4All versions (No fix recorded)
8 vendors · 26 products
