CVE-2026-8458wrong reuse for different services
- 6.5MediumCVSS base score
- 0.37%Exploitation in 30 daysEPSS · top 68% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
Description
libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services". libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
Timeline
ID reserved
By curl
- 51 days later
· 51 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Modified | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.37% · top 68% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Affected products
- affected 7.43.0 – < 8.14.2
- affected 8.15.0 – < 8.16.1
- affected 8.17.0 – < 8.20.1
- affected 97c272e5d173ad5f706443e2477f0a84f0044edd – < 5e99b73cf441d9c369768b9cd48b5389b9a2503d
- affected 8.20.0
- affected 8.19.0
- affected 8.18.0
- affected 8.17.0
- affected 8.16.0
- affected 8.15.0
- affected 8.14.1
- affected 8.14.0
- affected 8.13.0
- affected 8.12.1
- affected 8.12.0
- affected 8.11.1
- affected 8.11.0
- affected 8.10.1
- affected 8.10.0
- affected 8.9.1
- affected 8.9.0
- affected 8.8.0
- affected 8.7.1
- affected 8.7.0
- affected 8.6.0
- affected 8.5.0
- affected 8.4.0
- affected 8.3.0
- affected 8.2.1
- affected 8.2.0
- affected 8.1.2
- affected 8.1.1
- affected 8.1.0
- affected 8.0.1
- affected 8.0.0
- affected 7.88.1
- affected 7.88.0
- affected 7.87.0
- affected 7.86.0
- affected 7.85.0
- affected 7.84.0
- affected 7.83.1
- affected 7.83.0
- affected 7.82.0
- and 58 more
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-41504 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-8458)Record last updated .